Battery Protective Agent Composition for High-Rate Charge Discharge
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Solution Overview
Problem
Conventional battery electrode or separator surface protective agents lack satisfactory ionic conductivity, leading to high internal resistance and unsatisfactory high-rate charge/discharge cycle characteristics, causing charge and discharge loss and reducing battery performance and lifespan.
Innovation Solution
A battery electrode or separator surface protective agent composition comprising at least two types of organic particles that are substantially incompatible and capable of forming a continuous phase upon hot melt solidification, with one type thermally fusing to create a continuous phase for improved ionic conductivity and mechanical strength, and optionally incorporating inorganic particles or a core-shell type foaming agent for enhanced safety and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is formed on battery electrode and/or separator surface to improve safety and reduce internal resistance, then heat resistance and ionic conductivity are improved, but adhesion to electrode surface deteriorates
Solution Approach 1:
The patent uses a composite coating layer comprising a polymer base material and inorganic particles (such as metal oxides or ceramic particles). This composite structure combines the heat resistance of inorganic particles with the adhesion properties of the polymer matrix, resolving the contradiction between heat resistance and adhesion. The inorganic particles are dispersed within the polymer to create a synergistic material that exhibits both thermal stability and strong bonding to the electrode surface.
Solution Approach 2:
The coating layer is designed with non-uniform distribution of components, where inorganic particles are concentrated in regions requiring enhanced heat resistance while polymer-rich areas provide adhesion. This local variation in composition allows different regions of the coating to optimize for their specific functions, maintaining both heat resistance and adhesion simultaneously.
2Reliability
If a coating layer is formed on battery electrode and/or separator surface to improve safety, then insulation and ionic conductivity are improved, but mechanical strength deteriorates
Solution Approach 1:
The patent employs a composite coating layer where inorganic particles (such as ceramic particles or metal oxides) are dispersed within a polymer matrix. This composite structure provides both the insulation and ionic conductivity needed for safety while the interlocking network of particles and polymer enhances mechanical strength. The inorganic particles act as reinforcement elements that prevent coating layer degradation under mechanical stress.
Solution Approach 2:
The coating layer is designed with a porous structure that allows electrolyte penetration while maintaining mechanical integrity. The porous network provides ionic conductivity pathways while the three-dimensional structure of the polymer-inorganic composite maintains mechanical strength. The porosity is controlled to balance ion transport with structural reinforcement.
3Temperature
If conventional coating layers are used to prevent short-circuiting, then heat resistance is improved, but internal resistance increases
Solution Approach 1:
The patent uses a composite coating layer with inorganic particles dispersed in a polymer matrix, where the inorganic particles provide heat resistance while the polymer phase maintains ionic conductivity. This composite structure allows the coating to withstand high temperatures without forming a barrier to ion transport, thus reducing internal resistance compared to conventional homogeneous coating layers.
Solution Approach 2:
The patent optimizes parameters such as inorganic particle size, concentration, and distribution within the polymer matrix to balance heat resistance and ionic conductivity. By controlling the particle size and spacing, the coating allows sufficient ion transport pathways while maintaining thermal stability, thereby reducing internal resistance while preserving heat resistance.
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 significantly reduces internal resistance, enhances high-rate charge/discharge capabilities, and improves battery safety by preventing short-circuiting and stress relaxation, thereby extending battery life and performance.
Implementation Method 1
capable of being solidified by hot melt, wherein when the composition is solidified by hot melt, the organic particles of the same type thermally fuse with one another to form a continuous phase
Data Source
AI summary
A battery electrode or separator surface protective agent composition having fluidity and being capable of being solidified by hot melt, and comprising at least two types of organic particles comprising organic materials, wherein the organic particles of types different from each other are substantially incompatible with each other, wherein when the composition is solidified by hot melt, the organic particles of the same type thermally fuse with one another to form a continuous phase.