Date published: Feb. 19. 2026
Summary: A new solid polymer electrolyte for lithium metal batteries blends poly(pentyl malonate) with crosslinked poly(ethylene oxide). This electrolyte significantly improves stability against lithium metal anodes, preventing dendrites and extending battery life.
Applications:
- lithium metal anodes for rechargeable batteries
Advantages/Benefits:
- outperforms crosslinked PEO electrolytes in cycling and polarization tests while maintaining similar electrochemical properties
Background:
Current solid polymer electrolytes struggle with lithium metal anode instability, leading to dendrite formation, short operational lifetimes, and premature battery failure.
Technology Overview:
Scientists at Berkeley Lab have developed a solid polymer electrolyte for lithium metal batteries, formulated by blending crosslinked poly(ethylene oxide) (xPEO) with poly(pentyl malonate) (PPM) and lithium bis-trifluoromethanesulfonimide (LiTFSI) salt. This specific composition, called PPMxPEO, provides superior stability against lithium metal anodes, effectively suppressing dendrite formation.
This technology is differentiated by its dramatically enhanced stability compared to existing crosslinked PEO electrolytes, which are currently used commercially. Despite similar mechanical and electrochemical properties, PPMxPEO achieves significantly better performance, hypothesized to be due to chemical reactions forming a stable solid electrolyte interphase (SEI). It supports currents 20 times higher in cycling tests compared to other solid polymer electrolytes and showed no failure within 140 hours in plating experiments, compared to hours for other solid polymer electrolytes.
Development Stage: TRL 4
Inventors:
Status: Patent pending
Opportunities: Available for licensing and / or collaborative research
