Positive Electrode Sugar Alcohol Composition for Abnormal Heat Suppression
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries face challenges in achieving both high capacity and excellent heat-generation inhibiting function during abnormal conditions without compromising battery performance.
Innovation Solution
A positive electrode for non-aqueous electrolyte secondary batteries is developed, incorporating a sugar alcohol with less than or equal to 10 carbon atoms at a content rate of less than 5 mass % based on the mass of the positive electrode active material, which enhances the hydration reaction and heat absorption during abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery capacity is increased to achieve high performance, then the energy storage capability is improved, but the heat generation during abnormality increases drastically
Solution Approach 1:
A porous layer containing filler particles (metal hydroxide or metal oxide) is introduced as an intermediary substance between the electrode and separator. This porous layer acts as a mediator that absorbs heat during abnormal conditions without interfering with the battery's high capacity operation, thus resolving the contradiction between high energy storage and heat management
Solution Approach 2:
The patent utilizes a porous layer with controlled porosity to accommodate filler particles. The porous structure provides large surface area for heat absorption while maintaining ion permeability, allowing the battery to maintain high capacity while the porous filler material absorbs excess heat during abnormal conditions
2Object-generated harmful factors
If a porous layer with filler particles is added to improve heat-generation inhibition, then the safety is improved, but the device complexity increases
Solution Approach 1:
The porous layer serves multiple functions simultaneously: it provides heat absorption through filler particles, maintains ion transport pathways through its porous structure, and acts as a physical barrier. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving heat-generation inhibition
3Object-generated harmful factors
If the porous layer is placed between the electrode and separator, then the heat absorption capability is improved, but the ion permeability may be reduced
Solution Approach 1:
The porous layer is designed with controlled pore size and distribution that allows lithium ions to pass through while providing sufficient surface area for heat absorption. The porous structure ensures that ion permeability is maintained despite the presence of filler particles, resolving the contradiction between heat absorption capability and ion transport efficiency
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 solution effectively inhibits heat generation during abnormal conditions while maintaining high battery capacity, outperforming conventional approaches by achieving a balance between capacity and heat management.
Implementation Method 1
enhances the hydration reaction and heat absorption during abnormal conditions
Implementation Method 2
enhances the hydration reaction and heat absorption during abnormal conditions
Data Source
AI summary
A non-aqueous electrolyte secondary battery according to one embodiment of the present invention includes a positive electrode core material, and a positive electrode mixture layer formed on the surface of the positive electrode core material. The positive electrode includes a C10 or lower sugar alcohol, the sugar alcohol content being less than 5 mass % relative to the mass of a positive electrode active substance contained within the positive electrode mixture layer. The sugar alcohol is, for example, included within the positive electrode mixture layer. If the positive electrode mixture layer has a multilayer structure including a first layer and a second layer, the sugar alcohol content is preferably higher in the second layer than in the first layer.