Battery Electrode Coating Layer for Heat-Resistant Ion Transport
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Solution Overview
Problem
Conventional polyolefin microporous membranes used in separation membranes for secondary batteries suffer from heat resistance issues, leading to deterioration at high temperatures, and there is a need for improved ion permeability and high temperature stability.
Innovation Solution
A coating layer comprising rod-shaped inorganic particles and spherical organic particles, with a specific ratio of major axis to diameter, is applied directly to the electrode active material layer, enhancing air permeability and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyolefin microporous membrane is used as a separation membrane substrate, then ion permeability is achieved, but heat resistance deteriorates at high temperatures
Solution Approach 1:
The patent applies composite materials by combining polyolefin microporous membrane with inorganic particles (such as alumina, silica, or boehmite) to create a separation membrane that maintains the ion permeability of the polyolefin substrate while adding high-temperature stability through the inorganic particle coating layer
Solution Approach 2:
The patent changes the physical and chemical parameters of the separation membrane by controlling the particle size, composition ratio, and coating thickness of inorganic particles on the polyolefin substrate, thereby optimizing both heat resistance and ion permeability performance
2Ease of manufacture
If conventional separation membranes are used, then basic insulation properties are provided, but high temperature stability is insufficient
Solution Approach 1:
The patent creates a composite structure where the polyolefin substrate provides basic insulation and ion permeability, while the inorganic particle coating layer enhances high-temperature stability, combining the advantages of both materials
3Use of energy by moving object
If energy density is increased in lithium secondary batteries, then operating voltage and energy per unit weight improve, but requirements for high temperature stability of separation membrane increase
Solution Approach 1:
The patent uses composite materials in the separation membrane to enable lithium secondary batteries with higher energy density while maintaining the necessary high-temperature stability, as the inorganic particle coating allows the membrane to withstand higher operating temperatures
Solution Approach 2:
The patent modifies the separation membrane parameters (inorganic particle composition, size distribution, and coating density) to match the increased thermal requirements of high-energy-density battery systems
Data Source
AI summary
An electrode for a secondary battery according to exemplary embodiments includes an electrode current collector; an electrode active material layer formed on the electrode current collector; and a coating layer formed on the electrode active material layer and including rod-shaped inorganic particles and spherical organic particles, wherein a ratio of a length of major axis of the rod-shaped inorganic particle to a length of diameter of the spherical organic particle may be 3 to 5.