Chery's New Sulfide Patent Takes Aim at Solid-State Battery Degradation

Chery has filed a patent focused on sulfide-based solid-state battery cells, targeting one of the technology’s biggest hurdles: performance loss over time. The patent outlines a method to stabilize the interface between the sulfide solid electrolyte and the electrode materials, which is a common source of degradation in early solid-state designs. By addressing this, Chery aims to keep cells closer to their original capacity through repeated charge and discharge cycles.

The move fits into Chery’s broader effort to push energy density toward the 600 Wh/kg mark, a level that would significantly extend driving range compared to today’s mainstream lithium-ion packs. While the company has not issued a public statement on the patent, the filing itself signals that Chery is actively working on the materials science needed to make solid-state batteries commercially viable. Solid-state cells are widely seen as a next step for electric vehicles because they promise higher energy density and improved safety, but issues like degradation and manufacturing complexity have kept them from mass production.

Chery’s patent is one of many recent intellectual property moves by Chinese automakers racing to secure solid-state battery technology. The company is not alone in this pursuit, but the specific focus on sulfide electrolytes places it among a smaller group of players betting on that particular chemistry. If the approach works, it could help Chery reduce reliance on conventional liquid-electrolyte cells and gain a competitive edge in the next generation of EV batteries.