Separator Covering Layer with Inclined Particles for Battery Adhesion
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Solution Overview
Problem
Current secondary battery configurations do not adequately achieve superior battery characteristics, such as preventing short circuits and maintaining adhesion between electrodes during thermal contraction.
Innovation Solution
Incorporating a separator with a porous layer and a covering layer containing insulating particles with an average aspect ratio greater than or equal to 2 and an inclination angle between 45° and 135°, where the proportion of inclined particles to total insulating particles is greater than or equal to 10%, to enhance the battery's heat dissipation and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator is used between electrodes, then short circuits are prevented, but adhesion between separator and electrodes deteriorates during thermal contraction
Solution Approach 1:
The separator is constructed as a composite material consisting of a base separator layer and insulating particles with specific aspect ratios (≥2) and inclination angles (45°-135°). This composite structure provides both electrical insulation to prevent short circuits and mechanical interlocking through the oriented particles to maintain adhesion during thermal contraction.
Solution Approach 2:
The invention changes the physical parameters of the insulating particles, specifically controlling their aspect ratio to be greater than or equal to 2 and their inclination angle to be between 45° and 135° relative to the separator surface. These parameter changes enable the particles to effectively bridge gaps during thermal contraction while maintaining electrical insulation.
2Temperature
If insulating particles are added to the separator, then heat dissipation is improved, but manufacturing complexity increases
Solution Approach 1:
The separator utilizes a porous structure filled with insulating particles that have void spaces between them. This porous arrangement facilitates heat dissipation through increased surface area and potential convective pathways, while the particles themselves provide thermal insulation. The structure balances heat management with manufacturing feasibility.
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, a separator, and an electrolytic solution. The separator is disposed between the positive electrode and the negative electrode. The separator includes a porous layer and a covering layer. The covering layer is disposed between the porous layer and the positive electrode. The covering layer includes insulating particles. The insulating particles each have a major axis and a minor axis. An average aspect ratio of the insulating particles is greater than or equal to 2. The average aspect ratio is defined by the major axis and the minor axis of each of the insulating particles. The insulating particles include inclined particles. An inclination angle of each of the inclined particles is greater than or equal to 45° and less than or equal to 135°. The inclination angle is defined by a surface of the porous layer and the major axis. The positive electrode includes positive electrode active material particles. In a region between respective centers of two of the positive electrode active material particles that are adjacent to each other, a proportion of the number of the inclined particles to the number of the insulating particles is greater than or equal to 10%.