Battery
By adding silicon-based fluorophosphate compounds to the electrolyte of lithium iron phosphate batteries, the problems of large SEI film thickness and poor strength were solved, thereby extending battery cycle life and improving fast charging performance.
WO2026114122A1PCT designated stage Publication Date: 2026-06-04GUANGZHOU TINCI MATERIALS TECH
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GUANGZHOU TINCI MATERIALS TECH
- Filing Date
- 2025-11-21
- Publication Date
- 2026-06-04
AI Technical Summary
Technical Problem
In existing lithium iron phosphate batteries, the solid electrolyte interphase (SEI) film formed by vinylene carbonate is thick and has poor strength, resulting in insufficient battery cycle life and fast charging performance.
Method used
Adding silicon-based fluorophosphate compounds to the electrolyte forms polysilicon compounds and inorganic components, which fill the interior of the organic SEI membrane, improving the strength and toughness of the SEI membrane and enhancing the film formation effect.
Benefits of technology
By improving the quality of the SEI film, the cycle life of the battery can be extended, fast charging performance can be improved, internal resistance can be reduced, and the overall performance of the battery can be enhanced.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN2025136740_04062026_PF_FP_ABST
Abstract
A battery. The battery comprises a positive electrode sheet and an electrolyte; the positive electrode sheet comprises lithium iron phosphate; the electrolyte comprises vinylene carbonate and a silicon-based fluorophosphate compound represented by formula I: formula I; in formula I, R1, R2 and R3 are each independently selected from any one of H, F, C1-C4 alkyl, C1-C4 fluoroalkyl, C2-C4 alkenyl, C2-C4 fluoroalkenyl, C2-C4 alkynyl, C2-C4 fluoroalkynyl, C5-C7 cycloalkyl, R4 substituted phenyl, and R5 substituted benzyl, and R4 and R5 are each independently selected from any one of C1-C4 alkyl, C2-C4 alkenyl, C2-C4 alkynyl, C1-C4 fluoroalkyl, C2-C4 fluoroalkenyl, C2-C4 fluoroalkynyl, and F.
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