Gel Polymer Electrolyte with Heat-Conducting Particles for Uniform Curing
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Solution Overview
Problem
Gel polymer electrolytes in batteries suffer from uneven heat conduction during in-situ polymerization, leading to non-uniform polymerization, increased internal resistance, and reduced cycling capacity and cycle life, affecting kinetic performance.
Innovation Solution
Introduce heat-conducting particles with a heat conductivity coefficient greater than or equal to 400 W/mK into the electrolyte to enhance temperature uniformity, improving curing uniformity and impedance of the gel polymer matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat-conducting particles are introduced into the electrolyte, then temperature uniformity and curing uniformity are improved, but electrical conductivity may increase causing battery self-discharge
Solution Approach 1:
The patent applies local quality by selecting heat-conducting particles with specific material properties (diamond-like carbon with high thermal conductivity ≥400 W/mK and low electrical conductivity ≤10^-7 S/cm). This creates localized thermal enhancement without compromising overall electrical insulation, resolving the contradiction between temperature uniformity and self-discharge prevention.
Solution Approach 2:
The patent uses composite materials by combining diamond-like carbon particles with the gel polymer electrolyte matrix. This composite approach achieves both high thermal conductivity for temperature uniformity and low electrical conductivity to prevent self-discharge, simultaneously addressing both requirements.
2Manufacturing precision
If heat-conducting particles are added to improve curing uniformity, then polymerization uniformity improves, but particle size and concentration must be controlled to maintain electrochemical performance
Solution Approach 1:
The patent applies parameter changes by optimizing specific parameters of the heat-conducting particles: particle size (≤10 μm), concentration (0.1-5 wt%), and material composition (diamond-like carbon with controlled hydrogen content ≤50 at%). These parameter optimizations ensure both curing uniformity and electrochemical performance are maintained.
3Temperature
If diamond-like carbon with high heat conductivity is used, then curing uniformity improves, but hydrogen content must be controlled to prevent self-discharge
Solution Approach 1:
The patent applies parameter changes by precisely controlling the hydrogen content parameter of diamond-like carbon particles (≤50 at%, preferably ≤20 at%, most preferably ≤10 at%). This parameter control achieves the dual goal of high thermal conductivity for curing uniformity while maintaining low electrical conductivity to prevent self-discharge.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The introduction of heat-conducting particles improves temperature and curing uniformity, reducing impedance and enhancing kinetic performance of the battery while minimizing the risk of battery self-discharge.
Implementation Method 1
heat-conducting particles are dispersed in the electrolyte and have a heat conductivity coefficient greater than or equal to 400 W/mK at 25°C
Data Source
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AI summary
The present application discloses a gel polymer electrolyte, a battery and an electrical apparatus. The gel polymer electrolyte comprises an electrolyte, wherein heat-conducting particles are dispersed in the electrolyte and have a heat conductivity coefficient greater than or equal to 400 W/mK at 25°C.