Lithium Carbonate Cathode Coating for Halide Solid Electrolytes
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Solution Overview
Problem
Existing all-solid-state batteries face inefficiencies in charge and discharge due to oxidative decomposition of halide solid electrolytes, leading to reduced interfacial conductivity and increased resistance.
Innovation Solution
A positive electrode material comprising a positive electrode active material, a solid electrolyte represented by the composition formula LiαMβXγ, and a coating material containing lithium carbonate, which limits electron transfer and prevents oxidative decomposition of the solid electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halide solid electrolyte is used in all-solid-state battery, then ionic conductivity is improved, but oxidative decomposition occurs leading to reduced charge-discharge efficiency
Solution Approach 1:
An artificial protective coating layer is applied to the surface of the positive electrode active material. This coating layer acts as an intermediary barrier that prevents direct contact between the halide solid electrolyte and the positive electrode active material, thereby blocking the oxidative decomposition reaction while maintaining ionic conductivity for battery operation.
2Reliability
If coating material is applied to prevent oxidative decomposition, then charge-discharge efficiency is improved, but device complexity increases
Solution Approach 1:
The coating layer thickness is precisely controlled within a specific range (1-100 nm) to optimize performance. By adjusting this critical parameter, the coating provides sufficient protection against oxidative decomposition while remaining thin enough to maintain ionic conductivity and avoid excessive structural complexity.
3Object-affected harmful factors
If coating layer thickness is increased to improve protection, then oxidative decomposition prevention is enhanced, but ionic conductivity decreases
Solution Approach 1:
The coating layer thickness is optimized within the range of 1-100 nm. This precise parameter control ensures the coating is thick enough to provide effective protection against oxidative decomposition while remaining thin enough to allow sufficient ionic conductivity for efficient battery operation.
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 proposed configuration enhances the charge and discharge efficiency of batteries by reducing side reactions and interfacial resistance, thereby improving energy density and power characteristics.
Implementation Method 1
oxidative decomposition of halide solid electrolytes, leading to reduced interfacial conductivity and increased resistance
Data Source
AI summary
A positive electrode material contains at least one positive electrode active material, a solid electrolyte, and a coating material. The solid electrolyte is represented by formula (1),LiαMβXγ (1)where α, β, and γ are each independently a value greater than 0, M includes at least one element selected from the group consisting of non-Li metals and metalloids, and X includes at least one selected from the group consisting of F, Cl, Br, and I. The coating material covers the surface of the positive electrode active material and contains lithium carbonate.