Halide Solid Electrolyte for Positive Electrode
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Solution Overview
Problem
Current battery technologies face inefficiencies in charge/discharge processes, particularly due to the formation of resistance layers at the interface between the positive electrode active material and solid electrolyte, which hampers electrochemical stability and overall efficiency.
Innovation Solution
A positive electrode material comprising a metal oxyfluoride and a halide solid electrolyte, specifically formulated with lithium, metalloid, and halogen elements, which prevents the formation of resistance layers and enhances ionic conductivity, thereby improving charge/discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials are used in contact with positive electrode active material, then the battery structure is formed, but resistance layers form at the interface which reduces charge/discharge efficiency
Solution Approach 1:
The patent introduces an intermediary substance (halide solid electrolyte material containing Li, M, and X) that mediates between the positive electrode active material and the traditional solid electrolyte. This intermediary layer prevents direct harmful interactions at the interface while maintaining ionic conductivity, thereby preventing resistance layer formation and improving charge/discharge efficiency without compromising electrochemical stability
Solution Approach 2:
The patent changes the chemical composition parameters of the solid electrolyte material by selecting specific halide compounds (Li-M-X where X is Cl, Br, or I) with controlled ratios. By adjusting the chemical parameters (elemental composition and stoichiometry), the material achieves optimal balance between preventing resistance layer formation and maintaining high ionic conductivity for efficient charge/discharge
2Reliability
If resistance layers form at the interface between positive electrode active material and solid electrolyte, then electrochemical stability is compromised, but charge/discharge efficiency is significantly reduced
Solution Approach 1:
The halide solid electrolyte material serves as a protective intermediary layer that prevents direct contact and harmful reactions between the positive electrode active material and the traditional solid electrolyte. This intermediary function eliminates resistance layer formation, thereby preserving electrochemical stability and preventing energy loss during charge/discharge cycles
Solution Approach 2:
The patent converts the potential harmful interface reactions into a beneficial configuration by using the halide solid electrolyte material that inherently prevents resistance layer formation. The material's specific chemical composition (Li-M-X halide structure) transforms the interface from a harmful reaction zone into a stable, high-conductivity region that enhances overall battery performance
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 this material configuration significantly improves the charge/discharge efficiency of batteries by maintaining electrochemical stability and ensuring effective ionic conductivity, leading to enhanced battery performance.
Implementation Method 1
a first solid electrolyte material... the first solid electrolyte material includes Li, M, and X... enhances ionic conductivity
Data Source
AI summary
Provided is a positive electrode material which further improves charge/discharge efficiency. The positive electrode material according to the present disclosure includes a positive electrode active material and a first solid electrolyte material. The first solid electrolyte material includes Li, M, and X, and does not include sulfur. M is at least one selected from the group consisting of metalloid elements and metal elements other than Li. X is at least one selected from the group consisting of Cl, Br, and I. The positive electrode active material includes a metal oxyfluoride.