LMP Battery Positive Electrode Conductivity Switching
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Solution Overview
Problem
Lithium-metal-polymer (LMP) batteries face safety concerns due to parasitic exothermic reactions during overcharging or overdischarging, and existing solutions either require external electronic systems, increasing costs, or compromise electrochemical properties.
Innovation Solution
A positive electrode for LMP batteries comprising an electroactive layer with conductive polymers and halogenated polymers, acting as a switch at low and high potentials, and a current collector, which enhances safety and electrochemical performance by modulating conductivity and improving layer homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external electronic systems are added to LMP batteries to prevent overcharging or overdischarging, then safety is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The battery system performs safety monitoring and protection functions autonomously through the electroactive polymer layer integrated into the electrode structure. The polymer automatically changes conductivity state based on voltage conditions, eliminating the need for external electronic control systems while maintaining safety functionality.
Solution Approach 2:
The electroactive polymer layer serves multiple functions simultaneously: it acts as an electrode component for charge storage while also functioning as a voltage-dependent switch for safety protection. This multi-functionality integrates safety mechanisms directly into the battery structure without requiring separate electronic systems.
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 solution effectively limits overcharging and overdischarging issues while maintaining conventional battery performance, ensuring safety and simplicity in manufacturing without external electronic systems.
Implementation Method 1
The polymer P1 present in the electroactive layer will thus act as a switch: highly resistive at low and/or high potential but conductive in the field of activity of the positive electrode
Implementation Method 2
polymer material becoming non-conductive or semi-conductive outside the range normal operating voltage of said cells
Data Source
Figure 1~2
Figure 3~3b
Figure 4~4b
AI summary
The present invention concerns a composite positive electrode for a lithium battery, in particular a lithium-metal-polymer (LMP) battery, the use of same for producing an LMP battery and an LMP battery comprising same.