All-Solid-State Battery Protective Layer Against Short Circuits
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Solution Overview
Problem
The challenge is to inhibit the occurrence of short circuits in all solid state batteries, which is crucial for improving their safety.
Innovation Solution
The solution involves an all solid state battery design that includes a protective layer containing Mg-containing particles and a polymer between the anode current collector and the solid electrolyte layer, along with a solid electrolyte layer with a specific particle size ratio that inhibits short circuit formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is arranged between the anode current collector and the solid electrolyte layer, then short circuit occurrence is inhibited, but device complexity increases
Solution Approach 1:
A protective layer containing Mg-containing particles and polymer is introduced as an intermediary between the anode current collector and the solid electrolyte layer. This protective layer acts as a mediator that prevents direct contact and potential short circuits between the anode and electrolyte, while also serving as a buffer layer that accommodates volume changes during battery operation.
Solution Approach 2:
The protective layer is constructed using composite materials consisting of Mg-containing particles dispersed in a polymer matrix. This composite structure combines the protective properties of Mg-containing particles with the flexibility and binding properties of the polymer, creating a multi-functional layer that provides both short circuit prevention and mechanical stability.
2Reliability
If the average particle size of solid electrolyte is reduced relative to layer thickness, then short circuit inhibition is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a quantitative parameter range for the ratio of average particle size to layer thickness (0.005 ≤ X/Y < 0.02), where X is the average particle size and Y is the layer thickness. By controlling this dimensionless parameter within the specified range, the patent optimizes short circuit inhibition while providing clear manufacturing guidelines that balance performance requirements with manufacturability.
Data Source
AI summary
A main object of the present disclosure is to provide an all solid state battery in which occurrence of short circuit is inhibited. The present disclosure achieves the object by providing an all solid state battery comprising an anode including at least an anode current collector, a cathode, and a solid electrolyte layer arranged between the anode and the cathode; wherein a protective layer containing a Mg-containing particle that contains at least Mg, and also containing a polymer, is arranged between the anode current collector and the solid electrolyte layer; the solid electrolyte layer contains a solid electrolyte in a granular shape; and when X designates an average particle size D50 of the solid electrolyte and Y designates an average thickness of the solid electrolyte layer, X/Y is 0.0125 or more and 0.02 or less.