Latest Developments in Solid-State Battery Mass Production from 20 Companies

What is the latest progress in mass production of solid-state batteries? In China, Yiwei Lithium Energy has successfully completed the trial production of its “Longquan No. 2” line, producing 10Ah cells, while Guoxuan High-Tech has entered the trial mass production phase of its “Jinshi Battery” with a yield rate of 90%. These announcements from two major battery manufacturers have stirred excitement in the capital markets. At the recent Munich Auto Show, QuantumScape showcased the practical application of solid-state lithium-metal batteries in electric motorcycles, and Rimac presented a lighter, higher-density solid-state battery pack. The industry appears to be making significant strides in solid-state battery commercialization, though challenges remain regarding material stability, process maturity, and cost competitiveness.

Semi-Solid Applications Breakthrough

The semi-solid battery, which started gaining traction with the SAIC MG4, is set to be trial-produced this fourth quarter by Honeycomb Energy, supplying the next generation of BMW MINI models. As a transitional technology towards solid-state batteries, the commercialization of semi-solid batteries is already underway, raising expectations for solid-state battery performance.

Yiwei Lithium Energy: Launching Longquan No. 2

On September 2, during the unveiling of its mass production base in Chengdu, Yiwei Lithium Energy announced the successful launch of its “Longquan No. 2,” the company’s first solid-state battery. This 10Ah solid-state battery boasts an energy density of 300Wh/kg and a volumetric energy density of 700Wh/L, primarily targeting high-end applications such as humanoid robots, low-altitude aircraft, and AI technologies. The “Longquan” series will support multiple development routes, aiming for an energy density of 400Wh/kg and 1000Wh/L by 2025, thus accelerating the industrialization of solid-state batteries. The planned MWh production line in Chengdu is expected to be operational by the end of this year, with a total area of approximately 11,000 square meters and an annual capacity of nearly 500,000 cells. The project is divided into two phases, with the first phase expected to be completed by December 2025, providing 60Ah battery manufacturing capabilities, and the second phase aiming for a 100MWh annual capacity by December 2026.

Guoxuan High-Tech: 100% Localization of Core Equipment

Currently, Guoxuan High-Tech‘s “Jinshi Battery” is in the trial mass production stage, achieving a yield rate of 90% with a designed capacity of 0.2GWh. This milestone signifies a crucial transition from laboratory research to large-scale production efforts. Innovations in materials include the micro-nanization of solid electrolytes, ultra-thin membrane coating of single crystal positive electrodes, and three-dimensional mesoporous silicon negative electrodes, resulting in an energy density of 350Wh/kg, enabling a range of up to 1000 kilometers on a single charge. The core equipment for dry mixing and stacking has achieved complete localization, significantly reducing interface resistance by 90%, which simplifies production and assembly processes, potentially improving battery reliability and stability.

Honeycomb Energy: Mass Production of Semi-Solid Batteries in November

Honeycomb Energy is implementing a three-step strategy transitioning from liquid to semi-solid to solid-state batteries. In the semi-solid sector, the company emphasizes safety and production line compatibility to achieve large-scale production without additional investments. Two critical technological challenges have been overcome: the innovative development of a gel liquid formula that ensures good adhesion and polarity control under specific temperature and pressure conditions, and the transfer of the electrolyte layer to the positive electrode surface via temperature and pressure, utilizing existing liquid production lines. Recently, Yang Hongxin, Chairman and CEO of Honeycomb Energy, announced that the first generation of 270Wh/kg square cells has been developed, and a 2.3GWh semi-solid battery production line will commence mass production in November.

Innovation and Emerging Applications

China Innovation Aviation reported in its semi-annual report that its independently developed all-solid-state silicon-based battery has achieved an energy density of 430Wh/kg, outpacing competitors who typically range from 300-400Wh/kg. The corresponding production line has been established and is expected to deliver large-scale capacities this year. In the eVTOL sector, China Innovation Aviation became the first company to pass compliance reviews for eVTOL power battery manufacturing in 2022, achieving significant product deliveries and deepening collaborations with leading firms such as Xpeng and Guangqi.

QuantumScape: Solid-State Batteries Successfully Demonstrated in Electric Motorcycles

During the Munich Auto Show, QuantumScape partnered with PowerCo, a battery company under Volkswagen Group, to successfully demonstrate the world’s first QS solid-state lithium-metal battery powering an electric vehicle. The solid-state technology has reached an energy density of 844Wh/L, enabling fast charging from 10% to 80% in just over 12 minutes, along with a continuous discharge capability of 10C. The proprietary Cobra separator manufacturing process has been integrated into baseline production lines, increasing cell production speed by 25 times.

Rimac: Next Generation Solid-State Battery Allows Rapid Charging

Rimac showcased a next-generation solid-state battery developed in collaboration with ProLogium and Mitsubishi Chemical Group. Compared to current mainstream battery packs, this 100kWh battery offers a lighter weight, improved safety, and higher energy density. It can recharge from 10% to 80% in just 6.5 minutes, even maintaining 95% capacity in low-temperature conditions of -20°C. The solid structure design mitigates risks of combustion or explosion, thus alleviating concerns surrounding battery fires. This solid-state battery is nearly 90 kg lighter than existing mainstream liquid lithium batteries and 11% smaller in volume, translating to longer range, better handling, and more spacious vehicle interiors. According to Rimac’s official roadmap, this revolutionary battery is set to be integrated into high-performance electric vehicles by Q4 2027, although achieving such rapid charging will require charging stations with power outputs of 600-800kW or higher.

Mercedes-Benz: Solid-State Battery Completes 1205 km Range Test

Mercedes-Benz announced that its solid-state battery-equipped all-electric EQS test vehicle successfully completed a real-world long-distance road test. Starting from Germany, it traveled 1205 km across three countries to Sweden, with 137 km of range remaining. The solid-state battery cells were supplied by Factorial Energy, and the battery pack was developed in collaboration with F1 technology experts from Mercedes-AMG. To address the volumetric changes during charge and discharge, Mercedes installed pneumatic actuators to enhance battery stability and lifespan. The solid-state battery pack’s weight and size are comparable to that of the standard version of the EQS with lithium-ion batteries, which has a maximum range of approximately 774 km, whereas the solid-state battery version exceeds 1300 km.

Manufacturers Overcoming Production Challenges

Improving the solid-solid interface contact is key to enhancing the performance of all-solid-state batteries, which relies on material and fabrication process optimization. Recently, equipment manufacturers have focused on critical processes like dry electrode fabrication, solid electrolyte film formation, and stacking, while also considering economic efficiency by introducing flexible equipment compatible with both solid and liquid battery production. More processes are transitioning from laboratories to production lines, with Haimuxing delivering a RMB 400 million order for mass production equipment.

Xianhui Technology: Flexible Production Equipment for Dual Use

Recently, Xianhui Technology has delivered multiple sets of dry mixing coating equipment compatible with large-scale solid-state battery production to several leading battery manufacturers both domestically and internationally. This delivery includes production systems that integrate dry mixing for positive and negative electrodes, covering the entire process from controlled feeding to film formation, thinning, current collector compounding, and product quality inspection. The system can operate at speeds of up to 100m/min, meeting single-line production demands of 5-8GWh, with a product width of 1000mm and thickness of 40μm-300μm, making it suitable for efficient production across multiple lines. This flexible production equipment can accommodate various solid-state battery materials while ensuring energy consumption reductions of over 35% and a comprehensive manufacturing cost decrease exceeding 15%.

Manston: Composite Process with Dry Film Formation and Wet Coating

Manston‘s wet electrolyte thin coating system employs a dual-sided coating process involving “front coating → baking → back coating → baking.” This high-speed dual-sided coating design effectively prevents material mixing at the interface, ensuring the electrolyte layer remains independent and stable. To achieve a thin electrolyte layer with excellent interface contact, multiple key technologies have been integrated, including proportional sealing extrusion coating and wet thin-layer gap coating techniques that allow non-contact coating with the substrate, eliminating secondary damage to dry electrode substrates. The system can precisely control dry film thickness from 1 to 15μm, facilitating a diverse range of thin-layer solid electrolyte coating needs and demonstrating outstanding production efficiency with coating speeds of up to 60m/min.

Dao Technology: Liquid Phase Method for Lithium Metal Anodes

Recently, Dao Technology revealed a deep collaboration with Professor Li Jingze from the University of Electronic Science and Technology, innovatively adopting a liquid phase method for the preparation of lithium metal anodes. This new film formation method is not yet commercialized, but the company is actively advancing its mass production equipment, the liquid lithium coater. The equipment’s key challenge is maintaining the liquid lithium’s high temperature during storage and coating while ensuring an appropriate temperature in the glove box during application. Achieving double-sided coating with precise thickness control is crucial, and this approach may effectively address market gaps in the liquid phase coating method.

Liyuanheng: First Sulfide Solid-State Battery Production Line Delivered

Liyuanheng has begun the production and delivery of its first sulfide solid-state battery production line in collaboration with clients. This project encompasses all stages of solid-state battery manufacturing, marking a significant breakthrough in solid-state battery production. The company has announced that the equipment for the sulfide solid-state battery production line has entered the phase of production debugging and parameter optimization, with expected delivery by the end of the third quarter this year.

Haimuxing: Comprehensive Process for Lithium Metal Solid-State Battery Mass Production

In the solid-state battery equipment sector, Haimuxing is the first company to pursue dual technological routes for “lithium metal anode + oxide electrolyte” and “silicon-carbon anode + sulfide electrolyte.” The company has successfully established a comprehensive process for the mass production of lithium metal solid-state batteries and has received a RMB 400 million order for production equipment, marking the first commercially viable order for high-energy lithium metal solid-state battery equipment. In the sulfide solid-state battery route, the company has achieved comprehensive coverage of critical equipment, from solid-state electrode preparation to electrolyte film formation, bare cell assembly, and high-pressure formation, making significant technological advancements in key areas.

Yinghe Technology: 30% Efficiency Improvement in Electrode Manufacturing

In June, Yinghe Technology delivered solid-state wet coating equipment, solid-state roller pressing equipment, and solid-state electrolyte transfer equipment to a leading domestic battery company for batch production. The technical solutions cover both wet and dry process paths, with dry process equipment using physical extrusion to replace traditional solvent mixing, solving uniform dispersion challenges for sulfide electrolyte powders, with material residue rates below 0.5% to meet large-scale production needs. The third-generation dry mixing equipment has improved electrode manufacturing efficiency by 30%.

Honggong Technology: Tackling Dry Electrode Front-End Process Technology

Honggong Technology, a leader in mixed fiberization equipment, has supplied major domestic solid-state battery manufacturers. In collaboration with Qingyan Electronics, the joint venture Qingyan Honggong has improved core material discharge rates to 99.5% in the front-end mixing and homogenization stage, surpassing the industry average of approximately 95%. To address the high uniformity requirements for dry electrode coating thickness, Honggong Technology has developed a recovery system that treats waste electrodes from the dry coating process, effectively reducing the fragmentation rate of current collectors and is currently in the verification phase.

NakoNor: Dry Film Process Significantly Reduces Energy Consumption and Costs

NakoNor has advanced its dry rolling equipment technology while also developing thermal composite equipment for electrolyte membranes. In July, NakoNor announced the formal delivery of key solid-state battery equipment to leading clients, marking a technological breakthrough in solid-state battery equipment entering the industrial application stage. The dry film process significantly reduces energy consumption and costs by eliminating traditional electrode drying and solvent recovery steps, while also enhancing electrode density, laying the foundation for high-energy-density batteries. Innovations in thermal transfer technology enable precise coating of solid electrolyte membranes to anode layers, addressing solid-solid interface contact issues and improving ionic conductivity and stability, which are essential for mass production of sulfide/oxide system batteries.

Huazi Technology: Delivery of Solid-State Battery Hot Pressing Jigs in Q4

Huazi Technology expects to deliver hot pressing jigs for solid-state batteries in Q4 2025, with pressure levels increased from 3-5 tons to 60-80 tons, achieving uniform pressure distribution through a conductive structure (deviation < 5%). An intelligent temperature control system will maintain temperature fluctuations within ±2°C to accommodate sulfide electrolyte routes. Their semi-solid battery automatic production line has been delivered to leading clients, and the hot pressing jigs will promote tight adhesion between the solid electrolyte and electrode layers, reducing interface impedance by 20% and suitable for both soft-pack and square aluminum shell batteries.

Xianhui Technology: Deep Collaboration with SAIC Group

Xianhui Technology signed a cooperation agreement with Qingtao Energy in July 2024 to jointly develop core equipment for solid-state batteries, focusing on dry roller pressing equipment. In June 2025, they successfully delivered 0.2GWh solid-state battery trial production line equipment (integrated dry roller pressing machine). This achievement merges Xianhui Technology’s experience in intelligent manufacturing with Qingtao Energy’s cutting-edge solid-state battery technology, pushing physical limits in various aspects. The solid-state battery equipment developed in collaboration with Qingtao Energy is expected to achieve industrial-scale mass production delivery by the end of 2025, including dry roller pressing equipment for both positive and negative electrodes.

Lianying Laser: High-Precision Automated Welding Solutions

Lianying Laser has developed multiple laser welding devices, laser cleaning machines, and gluing machines in response to solid-state battery production needs, successfully delivering the first all-solid-state battery assembly line for industry-leading clients. The self-developed “ultrasonic rolling welder for composite current collectors” addresses industry challenges such as low alignment precision and inconsistent weld quality, designed specifically for high-precision welding of composite current collectors and foils (copper/aluminum), enabling fully automated production from roll material to finished products.

Putai Technology: Development of Fourth-Generation Solid-State Battery Materials and Equipment

Putai Technology has signed a joint development agreement with Blue Solutions to leverage its strengths in raw material supply and production equipment alongside Blue Solutions’ deep expertise in solid-state batteries to explore and implement optimal solutions for fourth-generation solid-state battery materials and equipment. Putai Technology will provide key components such as binders and active materials, along with customized production equipment.

Funeng Dongfang: First All-Solid-State Battery Stacking Machine Production Line

Funeng Dongfang’s subsidiary, Chaoye Precision, has developed a stacking machine with alignment precision controlled within 0.3mm, delivering the first all-solid-state battery stacking machine production line in China. In 2025, its solid-state battery equipment won a contract for the second-phase production line of Qingtao Energy, amounting to RMB 32 million; and in the first quarter of 2025, new solid-state battery equipment orders are expected to exceed RMB 200 million, with solid-state equipment revenue projected to surpass 15% for the year. Chaoye Precision has also signed a strategic cooperation agreement with Guoxuan High-Tech to jointly develop semi-solid battery production line solutions, with plans to achieve scalable delivery capabilities by 2026.