Summary of Key Points
Solid-state batteries have not yet been mass-produced, but capital has shifted from focusing on battery cell manufacturing to upstream materials (especially solid-state electrolytes and cathode/anode materials). 2027 is the year when mass production of solid-state batteries is expected to begin, but significant gaps in material supply and high technical challenges pose major bottlenecks. Governments, automakers, and battery manufacturers are all accelerating their investments in material development, as these upstream materials will be at the core of the next wave of solid-state battery innovation.
Detailed Analysis
1. Shift in Capital Focus: From Battery Cells to Materials
In the past, companies were competing to build solid-state battery production lines, but the trend has changed in the first half of this year. Investment in battery cells has declined slightly, while investment in solid-state electrolytes has surged by four times (exceeding 8 billion yuan). For example, Ruizhi New Energy, funded by state-owned assets from Shanghai and Yixing, focuses solely on solid-state electrolytes and interface coatings rather than battery cell production. Global financing is also heavily directed towards electrolyte research and development. The reason for this shift is that mass production for vehicle use is planned for 2027; having only a battery production line without the necessary materials is like trying to cook without rice. Investors are making early investments in materials, betting that they will become the critical bottleneck for mass production.
2. The Most Critical Challenge: Sulfide Electrolytes
The core of solid-state batteries is the use of solid-state electrolytes to replace liquid electrolytes, with the sulfide route being the most promising due to its fast conductivity and proximity to commercialization (accounting for 37% of investments). However, the production capacity of lithium sulfide, a key raw material for sulfide electrolytes, is extremely low:
- Based on the expected demand of 200 GWh of solid-state batteries by 2030, 140,000 to 200,000 tons of lithium sulfide are needed.
- The global effective production capacity for lithium sulfide is only in the “thousands of tons” range, and it is still in the transition from laboratory to industrial scale.
- The price of battery-grade lithium sulfide is extremely high, ranging from 2 million to 4.8 million yuan per ton, which needs to be reduced to below 500,000 yuan for commercialization to be feasible.
The reasons for the low production capacity include difficulties in purification (with a yield of only 70%-80%, meaning only 70-80 tons of qualified product can be produced from 100 tons of raw material) and challenges with production methods (either insufficient purity or safety issues with hydrogen sulfide neutralization). Companies such as Wanrun Co., Ltd. are building pilot production lines for lithium sulfide, while Guoci Materials is working on automated production processes, but mass production is still a long way off.
3. More Than Just Electrolytes: Cathode and Anode Materials Need Renovation
Using traditional lithium battery cathode and anode materials in solid-state batteries causes problems due to chemical reactions at the interface with the solid-state electrolyte, leading to shorter battery life and slower charging speeds. As a result, investors are now investing in cathode and anode materials:
- Yili (cathode material) has received investment from Skyworth, and Lisi New Materials (silicon-based anode material) has received funding from Jiayuan Technology.
- Greenmei is building a production facility with 500 tons of capacity, of which 499.9 tons are for solid-state cathodes, with only 0.1 ton for electrolytes.
- Qingtao Energy is building both battery cell production lines and developing its own cathode and anode materials to ensure compatibility.
4. Automakers No Longer Want to Be Passives: They Want to Control Their Material Supply Chains
In the liquid-state battery era, CATL held a 39.2% global market share, and automakers were constrained by both cost and technological timelines. With solid-state batteries, they want to take control:
- SAIC and Qingtao Energy have formed a joint venture to own solid-state battery technology.
- Chery has expanded its R&D team, and GAC has built a pilot production line for all-solid-state batteries.
- The supply chain is shifting from simply purchasing batteries to early joint research and development, with automakers directly participating in material design.
Whoever controls the materials will have significant influence over solid-state battery development.
5. Government Guidance: Materials Are the Key
The government has set a goal of developing 3-5 leading companies in solid-state batteries by 2027 and has specifically emphasized breakthroughs in solid-state electrolytes and silicon-based anode materials. With policy support, capital inflows, and corporate investments, upstream materials have become the focal point for solid-state battery development. The era of competing solely on battery cell production is over; materials are the new frontier.
In One Sentence
The key to mass-producing solid-state batteries lies not in “making batteries” but in “developing the right materials.” Companies that solve the challenges related to lithium sulfide and cathode/anode material compatibility will gain a competitive advantage in the 2027 solid-state battery market.