Latest Advances in Solid-State Lithium Batteries
A. Breakthrough in Material End: Gradual Overcoming of Core Bottlenecks
Sulfide electrolytes: Purity exceeds 99.9%, with a 40% cost reduction compared to imported products; iodide doping technology reduces solid-solid interfacial impedance to the 10⁻² Ω·cm² level, meeting mass production thresholds.
New Solid-State Electrolyte: A research team led by Professor Ma Cheng from the University of Science and Technology of China has developed a novel "lithium-zirconium-aluminum-chlorine-oxygen" electrolyte. This material contains no rare elements, costs less than 5% of mainstream sulfide systems, and does not require high voltage to maintain interface stability, demonstrating strong commercial potential.
Cathode Material: Lithium-rich manganese-based materials achieved first batch mass production and delivery. URC New Energy established an automated production line, integrating the entire process chain from precursor synthesis, sintering to interface optimization, providing support for high-energy-density batteries.
Negative Electrode Innovation: The team led by Chen Wanghua at Ningbo University has developed a three-dimensional "breathable" silicon nanowire negative electrode, mimicking the natural "respiration" mechanism, significantly enhancing the cycling stability of silicon negative electrodes in all-solid-state systems.
B. Process and Engineering: Mass Production Conditions Are Becoming Increasingly Mature
Interface modification technology: Iterative advancements in atomic layer deposition (ALD) and isostatic pressing equipment effectively improve electrode/electrolyte interface contact, enhancing structural consistency and battery yield, with semi-solid-state battery yields exceeding 88%.
Breakthrough in Repair Technology: A team led by Chen Zhongwei from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has developed "Electroinduced Accelerated Polymerization Interface Repair Adhesive," which can penetrate 500-nanometer microcracks and solidify within 30 seconds, addressing the challenge of micro-gaps in solid-solid interfaces.
Dry Electrode Process: Tesla announced the achievement of large-scale dry electrode production, simplifying the process and reducing costs, which is considered one of the key pathways to advancing the mass production of all-solid-state batteries.
C. Comprehensive Improvement in Performance and Safety
Energy density: Semi-solid-state battery mass-produced products achieve 350–450Wh/kg, while all-solid-state laboratory samples surpass 720Wh/kg, enabling electric vehicles to effortlessly exceed a 1,000-kilometer range, with some reaching up to 1,500 kilometers.
Safety: Solid-state batteries have passed rigorous tests such as needle penetration, overcharging, and heating, with no risk of thermal runaway, truly achieving "never spontaneous combustion.".
Cycle Life: Some products claim to achieve up to 100,000 charge-discharge cycles, far surpassing current liquid lithium batteries.
D. Policy and Industrial Chain Synergy Acceleration
The Ministry of Industry and Information Technology has included solid-state batteries in its key research and development priority list, offering a 30% subsidy for equipment purchases in pilot production lines.
The draft for public comment on "Solid-State Batteries for Electric Vehicles Part 1: Terms and Classification" has been released, marking the commencement of the standard system construction for solid-state batteries in China.
In February 2026, the Annual Conference of the China Solid-State Battery Industry-Academia-Research Collaborative Innovation Platform was held, bringing together vehicle and battery manufacturers such as FAW, BYD, and Blue Sky New Energy. The conference focused on collaborative research in materials, processes, and systems, aiming to promote the construction of a healthy industry ecosystem.