Vincent’s Insights/ Battery Innovation
Evolution of ProLogium’s Lithium Ceramic Battery Technology
Battery Innovation
Oct 08, 2026
From Gen 3 and Gen 3.5 to the Gen 4 All-Inorganic Superfluidized Solid-State Lithium Ceramic Battery
ProLogium’s Lithium Ceramic Battery evolves through coordinated advances in electrolytes, interfaces, ceramic separators, and cell architecture—not a single material change. Built on a scalable manufacturing platform, each generation improves safety, performance, energy density, production efficiency, and cost competitiveness.
From Gen 3 to Gen 4, the progression goes beyond liquid-to-solid conversion: from mass production to all-solid-state chemistry, then from passive protection to active safety within the cell. These advances combine high performance and high energy density while lowering manufacturing costs.
The goal is to resolve three key trade-offs in high-voltage, high-total-energy battery systems: safety vs energy density; energy density vs fast charging, high power, and low-temperature performance; and advanced materials vs scalable, affordable manufacturing.
By integrating materials and manufacturing, ProLogium brings these competing requirements together in one platform.
1. Gen 3: Establishing a Mass-Producible Composite Electrolyte and Ceramic Separator Platform
Gen 3 uses a composite solid-state electrolyte combining an oxide solid-state electrolyte with a solid polymer electrolyte (SPE). Without high-temperature sintering, limited solid–solid contact creates high interfacial resistance in pure oxide electrolytes.
Gen 3 therefore uses solvent-rich SPE chemistry to improve interfacial wetting and ion transport. Despite its substantial solid-state content, Gen 3 remains a quasi-solid-state system under a strict materials definition.
Gen 3’s key breakthrough also lies in its manufacturing architecture. ProLogium wet-coats the composite electrolyte directly onto the electrode layer to form a ceramic separator, eliminating the conventional PE/PP separator substrate. This simplifies production, improves efficiency, and supports roll-to-roll manufacturing of multilayer, large-area, high-capacity cells, providing a scalable foundation for traction and energy storage systems with many cells in series and high total energy.
Gen 3 thus translates materials research into a manufacturable cell architecture, marking ProLogium’s first key step toward a mass-producible solid-state battery platform.
2. Gen 3.5: Reducing Organic Content to Enable Large-Format, High-Energy-Density All-Solid-State Cells
Gen 3.5 builds on Gen 3’s mass-production platform while substantially reducing organic solvent content. This lowers electrolyte weight and improves the ceramic separator’s electronic insulation, allowing a thinner separator. Together, these changes increase both gravimetric and volumetric cell energy density.
Trace amounts of solvent remain to improve interfacial contact but are highly confined within the composite electrolyte’s microstructure. In the stringent six-hour vacuum weight-loss test at 120°C used in the relevant Chinese solid-state battery standard, three of five submitted cells were selected for testing, all showing weight loss below 0.05%. The cells therefore qualify as all-solid-state batteries under the classification principles of GB/T 43568-2026.
These improvements enable Gen 3.5’s large-format 184 Ah cell to achieve TÜV-verified energy densities of 381 Wh/kg and 903 Wh/L, demonstrating ProLogium’s ability to reach nearly 400 Wh/kg and around 900 Wh/L in large-format cells.
3. Gen 3.5’s Limitations: Higher Energy Density, but Interfacial Resistance and Safety Remain Unresolved
Gen 3.5 significantly improves energy density, but lower organic solvent content reduces interfacial wetting and increases interfacial resistance relative to Gen 3. At test temperatures of approximately 50–55°C, 5–80% SOC charging takes about 8.5 minutes for Gen 3 and 12 minutes for Gen 3.5. Although a thinner separator shortens the ion-transport distance, overall interfacial ion transport declines slightly, resulting in slower charging.
Both generations show good high-temperature tolerance, with capacity recovering to nearly 100% after two hours of storage at 100–130°C. However, high-temperature operation and complete prevention of thermal runaway are different safety requirements.
Oxide solid-state electrolytes (SSEs) are non-flammable and do not generate flammable substances. However, the solid polymer electrolyte (SPE) and trace organic solvents in both generations remain flammable at high temperatures, may decompose into flammable gases, and may react at interfaces with the highly oxidized cathode and highly reduced anode. Despite its very low organic content, Gen 3.5 has therefore not achieved no thermal runaway from room temperature to 300°C under standard ARC testing. This limitation became the fundamental starting point for Gen 4 development.
4. Gen 4’s Core Principle: From Non-Flammable Materials to Active Safety
Gen 4 rethinks batteries through the intrinsic safety of their chemical systems. Non-flammable solid-state electrolytes and ceramic separators provide important protection. Ceramic separators avoid the melting issues of conventional polymer separators, maintain electronic insulation and dimensional stability at high temperatures, and offer high mechanical strength and resistance to compression.
However, ProLogium has increasingly recognized that these materials remain passive safety defenses. The primary sources of thermal chain reactions and thermal runaway are the high-chemical-energy cathode and anode active materials and their interfaces with the electrolyte. Safety must therefore advance from passive protection to active intervention.
The first key to understanding next-generation battery safety is to distinguish material state, flammability, and system safety: solid-state does not mean non-flammable, and inorganic does not mean intrinsically safe.
5. Why Conventional Solid-State Electrolytes Cannot Fully Resolve Thermal Runaway
The main solid-state electrolyte types are oxides, sulfides, and polymers, with oxides being the principal inherently non-flammable systems. Polymer electrolytes are flammable, while sulfide electrolytes may generate sulfur, H₂S, or other flammable or reactive substances at high temperatures or under highly oxidizing conditions.
At high oxidation potentials, some sulfide systems may also exhibit electronic leakage or side reactions, triggering additional redox reactions. Under extreme conditions, concurrent lithium plating or metallic lithium formation may cause intense secondary reactions with the highly oxidized cathode, potentially producing high-temperature, lithium thermite-like reactions. Solid-state electrolytes
Therefore do not guarantee non-flammability or prevent thermal runaway in the entire cell.
Even non-flammable oxide electrolytes face interfacial limitations. Without high-temperature sintering, solid–solid contact is often insufficient. Practical cells therefore use composite electrolytes incorporating SPE or trace organic solvents to improve contact, reintroducing flammable organic components.
Artificial CEI/SEI layers or oxide coatings approximately 10–20 nm thick can protect electrode surfaces. However, prolonged exposure, high temperatures, or intense interfacial reactions can compromise these nanoscale layers. Localized lithium plating, micro short circuits, or other initiating events may then trigger a sequence of exothermic reactions inside the cell.
The key question is therefore not simply whether the electrolyte burns, but whether abnormal reactions inside the cell can be actively stopped before they develop into a thermal chain reaction.
6. Why High-Voltage, High-Total-Energy Batteries Need Cell-Level Active Safety
A battery is fundamentally different from a fuel tank or gas storage vessel. These are energy containers that generally do not ignite without an external ignition source. A battery, however, is an electrochemical energy reactor: every charge and discharge involves ongoing redox reactions, ion migration, and interface formation and decomposition. Over prolonged cycling, these chemical and electrochemical reactions cannot be guaranteed to remain identical.
Localized lithium plating, micro short circuits, electrolyte decomposition, side reactions at cathode and anode interfaces, or heating can initiate a self-accelerating exothermic chain reaction. At that stage, an external battery management system (BMS) can do little to intervene directly in the cell’s chemistry, underscoring the need for cell-level active safety.
This also helps explain why large energy storage systems continue to experience fires despite rarely being subjected to impacts. Multiple large battery energy storage system fire incidents occurred in Europe and North America between June and September 2026. The underlying issue is that large battery systems must be understood as high-energy reactors operating continuously over extended periods, rather than simply as containers for stored energy.
7. Even LFP Cannot Fully Eliminate Risks in Large Energy Storage Systems
LFP’s olivine structure and stable phosphate groups make it less prone than high-nickel cathodes to substantial oxygen release at high temperatures. Its cell-level thermal runaway intensity is therefore generally lower. However, large systems still face fire and thermal propagation risks.
At high-voltage cathode interfaces, organic electrolytes may decompose into low-molecular-weight hydrocarbons, while highly reducing anode interfaces may generate H₂ and other gases. With limited oxygen inside LFP cells, these flammable gases may not immediately burn completely. Continued accumulation can open the safety vent or, under extreme conditions, rupture the cell enclosure, releasing large volumes of hot, flammable gases.
Upon contact with oxygen in the surrounding air, these gases may form jet flames, heating neighboring cells and modules and triggering thermal propagation. For energy storage systems with high total energy, reducing individual cells’ thermal runaway intensity alone is therefore insufficient to fully address system safety.
8. ProLogium’s View: Active Safety Must Be Built into Cell Chemistry
ProLogium began exploring the safety limits of the oxide SSE + SPE architecture about a decade ago. From first principles, the key elements to control are the highly reactive cathode and anode active materials and their interfaces with the electrolyte—not just the separator.
ProLogium therefore believes that high-voltage, high-total-energy systems require a cell-level active safety mechanism alongside the passive protection of ceramic separators and non-flammable materials. When abnormal heating or an initiating reaction occurs, the system itself must actively stabilize the most hazardous cathode and anode active materials, directly interrupting the subsequent thermal chain reaction. Intervention must precede irreversible thermal runaway, rather than relying afterward on the BMS, thermal insulation, fire-resistant materials, or pack-level suppression.
An ideal next-generation battery must combine increasing energy with control over its own reactions: a controllable high-energy reactor, rather than a potential high-energy bomb.
9. 2017–2021: Developing ASM Active Safety Materials
Building on this principle, ProLogium spent approximately five years, from around 2017 to 2021, identifying several Active Safety Mechanism (ASM) materials capable of stabilizing cathode and anode active materials under specific conditions.
At abnormal internal temperatures, these materials can be released or activated to stabilize the highly oxidized cathode and highly reduced anode, reducing or terminating subsequent intense exothermic reactions.
However, Gen 3’s composite solid-state electrolyte still contains SPE and small amounts of organic solvent. Even with Gen 3.5’s extremely low solvent content, SPE and organic components may still generate flammable gases at high temperatures. Intrinsically safer cell chemistry therefore requires the complete removal of SPE and organic solvents.
10. From Halide/Halo-Sulfide Materials to a Third Electrolyte State
To achieve a fully inorganic system, ProLogium synthesized inorganic ASM materials with other inorganic materials, developing various halide and halo-sulfide solid electrolytes. Only materials that remained non-flammable under extreme temperatures, including gun-fire conditions at approximately 750–900°C, were selected as candidates.
However, conventional solid electrolytes presented several challenges. Many require very high manufacturing pressures and continuous external stack pressure during cell or even module operation. Insufficient pressure sharply reduces ionic conduction and interfacial contact. Moreover, truly non-flammable halide and halo-sulfide electrolytes often have lower ionic conductivity than highly conductive sulfide systems.
ProLogium therefore explored whether a new electrolyte state could combine high ionic conductivity, non-flammability, high Li⁺ concentration, a high Li⁺ transference number, and a self-adaptive interface with low manufacturing pressure, independence from high stack pressure, scalable production, and reasonable cost.
Using a specialized ligand, ProLogium ultimately transformed the solid electrolyte into a coordination compound/complex, creating a new Dynamic Coordination Network (DCN) state. Neither a conventional liquid-solution electrolyte nor a rigid solid electrolyte, it is called Superfluidized Inorganic Electrolyte (SFIE), also known as Superfluidized Inorganic Solid-State Electrolyte. It can be regarded as a new electrolyte state beyond conventional liquids and solids.
11. Six Core Characteristics of SFIE
1) ASM-Based Active Safety
SFIE’s material system derives from the ASM concept. Within a specific temperature range above approximately 120°C, it can release or activate ASM materials to stabilize cathode and anode active materials, directly intervening in potential thermal chain reactions.
Safety thus advances beyond preventing separator melting or electrolyte combustion to cell chemistry actively terminating the thermal chain reaction.
In standard ARC testing, SFIE + Ceramic Separator achieves no thermal runaway from room temperature to 500°C under both sealed and open-system conditions. ProLogium’s current results indicate that its high-temperature safety and stability even exceed those of certain NiMH battery systems.
2) Truly Non-Flammable Chemistry
SFIE is not only non-flammable itself. Under highly oxidizing and reducing electrochemical conditions, it also avoids generating large quantities of flammable gases or highly reactive by-products, unlike conventional organic electrolytes, SPE, or certain sulfide electrolytes. Its goal is therefore a non-flammable electrochemical system, rather than simply a non-flammable electrolyte.
3) Extremely High Ionic Conductivity
SFIE achieves room-temperature ionic conductivity of 50–60 mS/cm—approximately 5–6 times that of conventional organic liquid electrolytes and LGPS-type sulfide electrolytes, 30–50 times that of halo-sulfide/composite solid electrolytes, and on the order of 100 times that of pure oxide electrolytes. This supports thick electrodes and high areal capacities without sacrificing power or fast charging for energy density.
4) High Li⁺ Transference Number and Very Low Polarization
SFIE’s Li⁺ transference number is approximately 0.7–0.9. Although below the theoretical value of 1 for an ideal single-ion solid electrolyte, it far exceeds the typical 0.2–0.4 of organic liquid electrolytes and SPE. Its lithium-ion concentration also substantially exceeds that of conventional liquid-solution electrolytes, typically around 1–1.6 M. Together, these properties produce very low concentration polarization, enabling high energy density and high power.
At high areal capacities of 5.2–6.3 mAh/cm², SFIE supports 5–80% SOC charging in ≤5 minutes, 10–80% SOC in approximately 3 minutes, and high-rate charging and discharging. Even at rates approaching 20C, temperature rise can remain below approximately 2°C, substantially reducing the trade-off between thick electrodes, high areal capacity, and fast charging.
5) A Self-Adaptive Interface Enabled by the DCN
SFIE’s Dynamic Coordination Network (DCN) creates distinctive non-Newtonian rheology. Under stress or shear, viscosity decreases, allowing infiltration into electrode pores and contact with active-material interfaces. Once the force is removed, complex coordination bonds reform an inorganic gel-like network. SFIE thus combines liquid-like interfacial adaptability with solid-like ionic structure and concentration—the basis of the term “superfluidized.”
This also improves manufacturing. Conventional sulfide and halide solid electrolytes often require incorporation into electrodes early in production, with most processing conducted under stringent dry-room conditions. SFIE can instead be introduced later and infiltrate the electrode structure in its superfluidized state. This avoids maintaining the entire electrode line under extremely dry conditions, substantially reducing manufacturing complexity, dry-room CAPEX, energy consumption, and production cost.
6) A Cost Structure Approaching Conventional Liquid Electrolytes
SFIE requires neither extensive use of costly rare elements such as La and Ge nor expensive, highly reactive precursors such as Li₂S. The superfluidization process can use industrial-grade precursors with approximately 98–98.5% purity and purify them during processing to meet battery-grade electrolyte purity requirements of approximately 99.99%, substantially reducing raw-material purification costs.
Based on ProLogium’s current cost model, SFIE could become one of the few next-generation inorganic electrolytes with costs approaching conventional organic liquid electrolytes. Its material cost could be approximately 2–5% of that of typical LGPS- or LLZO-type solid electrolytes.
12. SFIE + Ceramic Separator: A Platform Designed for High-Voltage, High-Total-Energy Systems
SFIE + Ceramic Separator goes beyond another solid-state battery design. It addresses three goals:
1) Balanced Battery Performance
Balances safety, energy density, fast charging, high power, and low-temperature performance.
2) Scalable Manufacturing
Requires neither extreme manufacturing pressure nor continuously applied additional external pressure during module operation. The entire production line need not be redesigned around a conventional solid-state dry process.
3) Reasonable Cost
Offers a path toward the economics of the established lithium-ion battery industry across materials, equipment, facilities, and production efficiency.
13. From Consumer Electronics to High-Voltage, High-Energy Systems
Conventional organic carbonate electrolytes paired with PE/PP separators form a mature, successful system. They will continue serving smartphones, notebooks, wearables, and other consumer electronics with few cells in series and low total energy.
EVs, aircraft, marine applications, heavy-duty mobility, data center backup power, and large-scale ESS involve many cells in series, high voltage, and high total energy. Their requirements extend beyond individual cell energy density, placing fundamentally different demands on intrinsic safety, thermal propagation control, high power, and long-term electrochemical stability.
ProLogium therefore views SFIE + Ceramic Separator as a cell platform designed from the outset, through its chemistry and electrochemical architecture, for high-voltage, high-total-energy applications.
14. Gen 4.1: Integrating SFIE with the Existing Ceramic Separator
Gen 4.1, the initial Gen 4 version, already incorporates SFIE. This all-inorganic electrolyte is unsuitable for conventional PE/PP separators, making SFIE and ceramic separators highly complementary and interdependent technologies.
However, early Gen 4.1 cells retain the Gen 3/Gen 3.5 composite ceramic separator, comprising oxide SSE + SPE. Its ionic conductivity is substantially lower than SFIE’s, limiting overall fast-charging performance despite SFIE’s high conductivity.
Under this architecture, 5–80% SOC charging takes approximately 6.4 minutes. The composite separator’s more complex materials and manufacturing also keep costs relatively high.
15. Gen 4.2: Porous Inorganic Ceramic Separator + SFIE
Gen 4.2 redesigns the separator architecture, replacing the oxide SSE + SPE composite separator with a porous inorganic ceramic separator and introducing SFIE into its micropores.
This preserves physical isolation, high-temperature stability, electronic insulation, mechanical strength, and Non-compressibility while using SFIE’s exceptionally high ionic conductivity to improve ion transport. Separator ionic conductivity is approximately 20 times that of Gen 4.1, reducing 5–80% SOC charging time from approximately 6.4 minutes to under 5 minutes.
Gen 4.2 also simplifies separator materials and manufacturing, further reducing costs.
16. The Broader Significance of the Technology’s Evolution
ProLogium’s Lithium Ceramic Battery evolution focuses on overcoming trade-offs once considered unavoidable, rather than maximizing any single metric.
Gen 3 reconciles solid-state chemistry with mass manufacturability, establishing a mass-producible composite SSE and ceramic separator platform.
Gen 3.5 advances high energy density alongside large-format cell manufacturing, reducing organic content, electrolyte weight, and separator thickness to deliver large-format all-solid-state cells at 381 Wh/kg and 903 Wh/L.
Gen 4 addresses high energy density versus safety through SFIE and ASM-based active safety, extending protection beyond non-flammable materials to active intervention within cell chemistry. It also reconciles high energy density with electrical performance: ionic conductivity of 50–60 mS/cm, a Li⁺ transference number of 0.7–0.9, high lithium-ion concentration, and a self-adaptive DCN interface enable thick electrodes, high areal capacities, and ultrafast charging and discharging to coexist.
Finally, Gen 4 addresses next-generation batteries versus manufacturing cost. Low-cost precursors, purification through superfluidization, low-pressure manufacturing, and no requirement for an ultra-dry process across the entire line offer a path for inorganic electrolyte costs to approach those of conventional organic liquid electrolytes.
Conclusion
ProLogium’s Lithium Ceramic Battery evolution goes beyond liquid-to-solid conversion. It advances from passive to active safety, from individual performance optimization to system-wide balance, from laboratory materials to scalable production, and from high-performance but costly technology to a commercially competitive battery platform.
Gen 3 established a mass-producible composite SSE + Ceramic Separator architecture. Gen 3.5 reduced organic content, thinned the separator, and increased large-format cell energy density, laying the foundation for large-format all-solid-state cell production. Gen 4 combines SFIE, ASM-based active safety, and ceramic separators to redefine the material and safety architecture of high-voltage, high-total-energy batteries. Gen 4.2 further reduces separator ionic resistance through a porous inorganic ceramic separator + SFIE, achieving a fuller balance of safety, high energy density, ultrafast charging, high power, low-temperature performance, manufacturability, and cost.
ProLogium’s ultimate goal extends beyond proving solid-state batteries superior to liquid-electrolyte batteries. It is to build a safe, high-energy, high-power, scalable, and cost-competitive electrochemical platform for next-generation high-voltage, high-total-energy applications. SFIE + Ceramic Separator is the core of that platform—and the fundamental significance of Gen 4 Lithium Ceramic Battery technology.
SFIE + Ceramic Separator is the core of that platform and embodies the fundamental significance of Gen 4 Lithium Ceramic Battery technology. It brings together two decades of ProLogium’s technological progress and battery development philosophy, closing the loop between materials, safety, performance, and manufacturing.
