Sulfide All-Solid-State Battery Heat Absorbing Layer
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Solution Overview
Problem
Sulfide all-solid-state batteries with inorganic hydrate heat absorbing layers experience moisture release at operating temperatures, leading to battery material deterioration and capacity reduction over time.
Innovation Solution
Incorporating a heat absorbing layer made of organic materials such as sugar alcohols and hydrocarbons within the battery, which do not contain inorganic hydrates, to absorb heat without releasing hydration water, thus preventing material deterioration and maintaining battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an inorganic hydrate heat absorbing layer is provided in a sulfide all-solid-state battery, then heat can be absorbed during abnormal heat generation, but moisture is released at operating temperature causing battery material deterioration and capacity reduction
Solution Approach 1:
The patent changes the material composition of the heat absorbing layer from inorganic hydrate to organic material, fundamentally altering the chemical properties to eliminate moisture release while maintaining heat absorption capability through phase change
Solution Approach 2:
The patent utilizes the phase transition (melting) of organic materials in the heat absorbing layer to absorb heat during abnormal temperature events, replacing the hydration water evaporation mechanism of inorganic hydrates with an organic melting process that does not release harmful substances
2Temperature
If an inorganic hydrate is used as heat absorbing material, then heat absorption function is provided, but the inorganic hydrate reacts with sulfide solid electrolyte causing gradual deterioration
Solution Approach 1:
The patent introduces an organic material as an intermediary substance in the heat absorbing layer that acts as a buffer between the heat generation source and the sulfide solid electrolyte, preventing direct harmful interactions while still providing heat absorption functionality
Solution Approach 2:
The patent employs organic materials that can undergo phase change and potentially degrade without harming the battery system, sacrificing the heat absorbing material itself to protect the critical battery components from deterioration
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 use of sugar alcohols and hydrocarbons as heat absorbing materials in the heat absorbing layer effectively suppresses battery material deterioration and maintains high capacity even after long-term use by melting and absorbing heat during abnormal temperature events.
Implementation Method 1
Both sugar alcohols and hydrocarbons satisfy these conditions... sugar alcohols and hydrocarbons melt (fuse) when the battery extraordinarily generates heat, whereby heat can be appropriately absorbed
Implementation Method 2
the above organic heat absorbing material has a melting point of 70° C. or more and 250° C. or less
Data Source
AI summary
A sulfide all-solid-state battery which is capable of absorbing heat by a heat absorbing layer at abnormal heat generation and maintaining capacity of a battery at a high level for a long time use is provided. The sulfide all-solid-state battery contains at least one unit cell, at least one heat absorbing layer, a battery case which accommodates the unit cell and the heat absorbing layer, the unit cell contains sulfide solid electrolyte, the heat absorbing layer contains at least one organic heat absorbing material selected from the group consisting of sugar alcohols and hydrocarbons, and the heat absorbing layer does not contain an inorganic hydrate.