Li Auto-backed, Chinese battery maker Sunwoda Electronic Co., Ltd. unveiled its next-generation polymer all-solid-state battery, branded Xin·Bixiao (欣·碧霄), at the 2025 New Energy Battery Industry Development Conference in Beijing, as reported by First-Finance. The company claims the battery achieves an energy density exceeding 400 Wh/kg and a cycle life of more than 1,200 cycles at low external pressure, positioning it as a potential breakthrough for long-range electric vehicles (EVs).
Sunwoda says the Xin·Bixiao battery surpasses current mainstream ternary lithium-ion cells, which typically offer 250-350 Wh/kg, by 14%-60%. This higher energy density could allow EVs to achieve ranges over 1,000 km, addressing consumer range concerns. With over 1,200 cycles and capacity retention above 80%, the battery could support vehicle usage over a decade, assuming annual driving of 20,000 km. The company has also developed a laboratory sample using a lithium-metal anode that reaches 520 Wh/kg, marking a potential next step beyond polymer solid-state technology, with preliminary safety testing already completed.
The performance of the Xin·Bixiao battery relies on a combination of a cross-linked polymer electrolyte and a gradient-coated lithium-metal anode, which together improve ionic conductivity and reduce dendrite formation. Sunwoda notes that this approach avoids reliance on more expensive sulfide electrolytes, potentially lowering material costs.
To move toward commercialization, Sunwoda plans to complete a 0.2 GWh polymer solid-state cell pilot line by the end of 2025. Small-batch production is expected in 2026, with GWh-scale output targeted by 2027.
The company says construction and equipment procurement are nearly finished. Sunwoda is also engaging with several new-energy vehicle startups and legacy luxury automakers, with some reportedly planning to use the Xin·Bixiao battery in flagship models from 2026 onward. China Association of Automobile Manufacturers deputy secretary-general Chen Shihua commented that mass production of solid-state batteries could reshape the competitive landscape for EVs and boost China’s technological position.
Independent sources indicate that while Sunwoda has supply relationships with automakers including Li Auto, Nio, Xpeng, SAIC, GAC, and Dongfeng, no publicly confirmed contract yet exists specifying a production vehicle using the Xin·Bixiao battery. The company also signed a materials-focused partnership with XTC New Energy Materials for all-solid-state battery development.
Follow us for ev updates
