Solid-State Battery Cathode With Endothermic Heat Suppression
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Solution Overview
Problem
All-solid-state rechargeable batteries face challenges in managing heat generation and safety, particularly when exposed to high temperatures, due to the generation of oxygen and potential exothermic reactions.
Innovation Solution
Incorporating an endothermic material, such as a carbonate or hydroxide compound, into the positive electrode layer of the battery, which absorbs heat through a decomposition reaction, thereby mitigating heat buildup and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all-solid-state rechargeable batteries use high temperature environments or certain positive electrode active material compositions, then oxygen is generated, but this leads to exothermic reactions and safety issues
Solution Approach 1:
The patent converts the harmful exothermic reaction tendency into a beneficial safety mechanism by incorporating endothermic materials (such as metal hydroxides or carbonates) that undergo decomposition reactions to absorb excess heat. These materials are deliberately chosen because their decomposition temperatures and heat absorption capacities complement the battery's operating conditions, transforming potential thermal runaway into a controlled heat-sinking process that enhances safety.
Solution Approach 2:
The patent modifies the thermal parameters of the battery system by adding endothermic materials with specific decomposition temperatures and heat absorption characteristics. By carefully selecting materials whose decomposition occurs at temperatures below the onset of harmful exothermic reactions, the patent changes the thermal behavior of the battery, creating a heat absorption buffer that prevents temperature escalation and maintains operational safety.
2Object-affected harmful factors
If endothermic material is added to the positive electrode layer, then heat absorption capacity increases, but battery composition complexity increases
Solution Approach 1:
The patent merges the endothermic material directly into the positive electrode layer structure, combining the electrode function with the thermal management function in a single integrated component. This approach eliminates the need for separate thermal management layers or additional components, as the endothermic material is incorporated as an integral part of the electrode assembly, thereby reducing overall structural complexity while maintaining heat absorption capacity.
Solution Approach 2:
The endothermic materials selected for the positive electrode layer serve multiple functions: they provide the primary electrode active material for energy storage and simultaneously act as heat absorption agents during thermal events. This multi-functionality reduces the need for additional dedicated thermal management materials, simplifying the overall battery composition while achieving both energy storage and safety objectives.
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 endothermic materials in the positive electrode layer effectively suppresses rapid heat generation and exothermic reactions, even at high temperatures, thereby improving the safety and reliability of all-solid-state rechargeable batteries.
Implementation Method 1
the positive electrode layer includes an endothermic material that absorbs heat by a decomposition reaction
Data Source
AI summary
An all-solid-state rechargeable battery including a positive electrode layer; a negative electrode layer; and a solid electrolyte layer between the positive electrode layer and the negative electrode layer, wherein the positive electrode layer includes a plate-shaped positive electrode current collector, and a positive electrode active material layer on the positive electrode current collector, the positive electrode layer includes an endothermic material that absorbs heat by a decomposition reaction, and a content of the endothermic material in the positive electrode layer is greater than or equal to about 1 part by weight and less than or equal to about 30 parts by weight, based on 100 parts by weight of the positive electrode active material layer.