Halide Solid Electrolyte Coating for Battery Interface
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Solution Overview
Problem
The charge-discharge efficiency of batteries using halide solid electrolytes is decreased due to oxidative decomposition, leading to side reactions and increased interface resistance, as the halogen elements in the electrolytes are oxidized, affecting the battery's performance.
Innovation Solution
A positive electrode material configuration that includes a first solid electrolyte material composed of lithium, metalloid, and halogen elements, with a coating material applied to the surface of the positive electrode active material to suppress electron transfer and prevent oxidative decomposition, thereby improving ion conductivity and reducing interface resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If halide solid electrolyte is used in the battery, then ion conductivity is improved, but oxidative decomposition occurs leading to decreased charge-discharge efficiency
Solution Approach 1:
A coating layer is introduced as an intermediary between the positive electrode active material and the halide solid electrolyte. This coating layer acts as a mediator that prevents direct contact and chemical reactions between the two materials, thereby suppressing oxidative decomposition of the halide solid electrolyte while maintaining ion conductivity. The coating layer serves as a protective barrier that allows ionic transport without enabling harmful chemical interactions.
2Reliability
If coating material is applied to suppress electron transfer, then oxidative decomposition is prevented, but interface resistance increases
Solution Approach 1:
The coating layer's properties are optimized by controlling its thickness and composition parameters. The thickness is maintained within a specific range (1-100 nm) to balance two opposing requirements: sufficient thickness to prevent electron transfer and oxidative decomposition, yet thin enough to allow efficient ion transport and minimize interface resistance. This parameter optimization resolves the contradiction between protection and conductivity.
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 configuration enhances charge-discharge efficiency and energy density by preventing side reactions and reducing interface resistance, allowing for improved battery performance and operation at high output.
Implementation Method 1
the coating material suppresses electron transfer and prevents oxidative decomposition
Implementation Method 2
the first solid electrolyte material includes: lithium; at least one kind selected from the group consisting of metalloid elements and metal elements other than lithium; and at least one kind selected from the group consisting of chlorine, bromine, and iodine
Data Source
AI summary
Provided is a positive electrode material including a positive electrode active material, a first solid electrolyte material, and a coating material. The coating material is located on the surface of the positive electrode active material. The first solid electrolyte material includes lithium, at least one kind selected from the group consisting of metalloid elements and metal elements other than lithium, and at least one kind selected from the group consisting of chlorine, bromine, and iodine. The first solid electrolyte material does not include sulfur.