Date published: Feb. 9, 2026
Summary: New solid electrolytes for batteries use controlled redox reactions, called “dynamic stability,” to extend their stability window. This enables higher energy density and improved performance in all-solid-state batteries.
Applications:
- Electric vehicle batteries
- Grid-scale energy storage
- Portable device batteries
Advantages:
- High energy density
- Superior cycling stability and capacity retention
- Enhanced safety
- Wide compatibility with advanced anodes, including Si and Sn metal, as well as high-voltage cathodes such as NMC, LMR-NMC, LiNi0.5Mn1.5O₄ and DRX
Background: Existing solid electrolytes suffer from narrow electrochemical stability windows, restricting their compatibility with advanced, high-capacity electrodes and limiting overall battery performance.
Technology Overview:
Scientists at Berkeley Lab have developed a class of redox-active halide solid electrolytes (HSEs) for all-solid-state batteries that utilize “dynamic stability.” This mechanism involves controlled, structurally reversible redox reactions within the electrolyte itself, extending its effective electrochemical stability window. This enables stable operation with high-capacity alloy anodes, such as silicon, and high-voltage cathodes, while forming beneficial solid electrolyte interphases.
This technology is differentiated by intentionally leveraging, rather than avoiding, electrolyte redox reactions to improve battery performance. Unlike conventional solid electrolytes, these HSEs, including Li3YCl6, maintain their crystal structure during these reactions, offering superior cycling stability, alloy anode compatibility, and wider voltage windows than sulfide and oxide counterparts. The technology enables high energy densities, with symmetric cell demonstrations exceeding 1000 hours and full cell cycling over 500 cycles.
Development Stage: Proof of concept
Inventors:
Shuhao Yang
Status: Patent pending
Opportunities: Available for licensing and / or collaborative research
