All Solid State Battery Anode Heat Inhibition via Coated Oxide Additives
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Solution Overview
Problem
All solid state batteries with graphite anode layers can generate heat when exposed to high temperatures, posing a safety concern due to the reaction between lithium and sulfide solid electrolyte materials.
Innovation Solution
Incorporating specific oxides such as MoO3, Sb2O3, and MnCO3 as additives in the anode layer, coated with a hydrocarbon resin, which react only at high temperatures, reducing the calorific value and inhibiting heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sulfide solid electrolyte material is used in the all solid state battery, then Li ion conductivity is improved, but heat generation occurs in the anode layer when exposed to high temperature
Solution Approach 1:
The patent introduces a coating layer as an intermediary substance between the graphite anode and the sulfide solid electrolyte. This coating layer acts as a mediator that prevents direct contact and harmful reactions between graphite and the solid electrolyte at high temperatures, while still allowing Li ion transport. The coating layer specifically suppresses the exothermic reaction that causes heat generation, resolving the contradiction between maintaining high Li ion conductivity and preventing heat generation.
Solution Approach 2:
The patent employs a composite structure combining graphite anode material with a coating layer to create a composite anode. This composite material approach allows the battery to maintain the advantages of sulfide solid electrolytes (high Li ion conductivity) while adding the protective function of the coating layer to prevent heat generation. The composite structure integrates both functional requirements into a single system.
2Use of energy by moving object
If graphite is used as anode active material, then energy density is improved, but heat generation occurs during high temperature exposure in charged state
Solution Approach 1:
The coating layer serves as an intermediary protective barrier between the graphite anode and the sulfide solid electrolyte. It allows the graphite to maintain its high energy density characteristics while preventing the harmful exothermic reaction that occurs at high temperatures. The coating layer specifically blocks the direct interaction between graphite and electrolyte that causes heat generation.
Solution Approach 2:
The patent uses a thin film coating layer to protect the graphite anode. This thin film structure provides sufficient protection against heat generation while maintaining the overall energy density of the battery. The coating layer is thin enough to not significantly impact the energy storage capacity of the graphite anode.
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 effectively inhibits heat generation in the anode layer during high-temperature exposure, maintaining battery performance while preventing excessive heat buildup.
Implementation Method 1
MoO3, Sb2O3, and MnCO3 react with Li, and the calorific value at the time of the reaction is small
Implementation Method 2
a coating portion that coats at least a part of the oxide and includes a resin with a hydrocarbon chain as a main chain
Data Source
AI summary
The main object of the present invention is to provide an all solid state battery with capability of inhibiting heat generation of an anode layer. The present invention solves the problem by providing an all solid state battery comprising a cathode layer, an anode layer, and a solid electrolyte layer formed between the cathode layer and the anode layer, wherein at least one of the anode layer and the solid electrolyte layer contains a sulfide solid electrolyte material; the anode layer contains an anode active material that is graphite, and contains an additive; and the additive has an oxide that is at least one kind of MoO3, Sb2O3, and MnCO3, and a coating portion that coats at least a part of the oxide and includes a resin with a hydrocarbon chain as a main chain.