Resin Current Collector Electron Conductive Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resin current collectors in lithium batteries experience rapid cycle deterioration when used at temperatures slightly higher than room temperature, leading to reduced battery performance and lifespan compared to traditional Al collectors.
Innovation Solution
A positive electrode configuration is developed with an electron conductive layer containing epoxy resin and a conductive filler, disposed on the surface of a resin current collector made of polypropylene, which prevents direct contact with the electrolyte solution and reduces ion conduction, thereby minimizing oxidative side reactions and enhancing cycle durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin current collector is used, then volume efficiency is improved and battery cost is reduced, but cycle deterioration accelerates at temperatures slightly higher than room temperature
Solution Approach 1:
An electron conductive layer is introduced as an intermediary between the resin current collector and the positive electrode active material layer. This intermediate layer prevents direct contact between the conductive filler and electrolyte solution, suppressing oxidative side reactions while maintaining electronic conductivity, thereby improving cycle durability at elevated temperatures
Solution Approach 2:
The electron conductive layer is constructed as a composite material comprising epoxy resin and conductive filler. This composite structure provides both electronic conductivity and chemical stability, preventing the resin current collector from degrading at elevated temperatures while maintaining its function
2Reliability
If an electron conductive layer is added, then cycle durability is improved, but device complexity increases
Solution Approach 1:
The electron conductive layer uses epoxy resin with specific chemical properties (low ion conduction, high electron conductivity) to change the functional parameters of the current collector system. This parameter optimization improves cycle durability without requiring complex structural modifications
Solution Approach 2:
The electron conductive layer is applied only on the surface of the resin current collector that contacts the positive electrode active material layer, providing targeted protection where oxidative reactions occur most, rather than complicating the entire electrode structure
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 proposed configuration significantly improves the cycle life and durability of the positive electrode, reducing capacity loss and maintaining battery performance under elevated temperature conditions.
Implementation Method 1
an electron conductive layer which is disposed to have no direct contact of a conductive filler on a surface of a resin current collector with an electrolyte solution
Implementation Method 2
hardly allowing an occurrence of an oxidative side reaction on a conductive filler that is in contact with a resin matrix
Implementation Method 3
having an electronic connection to a resin current collector
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
To provide a means for improving durability of a positive electrode for a lithium battery (in particular, a resin current collector for forming the positive electrode). The means is achieved by a positive electrode for a lithium battery having a resin current collector containing a polyolefin-based resin matrix and a conductive filler, and a positive electrode active material layer provided on the resin current collector, characterized in that an electron conductive layer is disposed on the surface of the resin current collector that is in contact with the positive electrode active material layer.