Compact Coating Layers for Lithium-Rich Cathode Capacity Retention
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Solution Overview
Problem
Lithium-rich metal oxide materials in batteries face issues with lithium dissolution, leading to side reactions and reduced charge capacity and ion migration due to the alkalinity of gel-like by-products, increasing material resistance.
Innovation Solution
A coated lithium-rich metal oxide material with a high-integrity and compact carbon, silicon oxide, or metal oxide coating layer, prepared using plasma enhanced chemical vapor deposition, reduces lithium dissolution and enhances ion migration and charge capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium-rich metal oxide material is used to increase battery energy density, then charge capacity is improved, but lithium dissolution occurs leading to side reactions and increased material resistance
Solution Approach 1:
A coating layer comprising one or more of carbon, silicon oxides, and metal oxides is applied to the lithium-rich metal oxide material. This coating layer acts as an intermediary barrier between the lithium-rich material and the external environment, preventing lithium dissolution while allowing lithium ion migration, thus resolving the contradiction between maintaining high charge capacity and preventing harmful side reactions
Solution Approach 2:
The invention creates a composite structure by combining lithium-rich metal oxide material with a protective coating layer. This composite material structure integrates the high energy density benefits of lithium-rich materials with the protective functions of the coating layer, simultaneously achieving high charge capacity and resistance to lithium dissolution
2Reliability
If coating layer is applied to prevent lithium dissolution, then material resistance is reduced and ion migration is improved, but manufacturing process complexity increases
Solution Approach 1:
The invention optimizes coating parameters including thickness (1-10 nm), composition ratios, and deposition conditions to achieve effective lithium protection with minimal impact on ion migration. By carefully controlling these parameters, the coating provides protective functions while maintaining simple and feasible manufacturing processes
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 coated material improves lithium ion migration rates and reduces material resistance, leading to increased battery capacity and stability.
Implementation Method 1
A coated lithium-rich metal oxide material with a high-integrity and compact carbon, silicon oxide, or metal oxide coating layer, prepared using plasma enhanced chemical vapor deposition
Data Source
AI summary
The present application provides a coated lithium-rich metal oxide material and a preparation method therefor, a method for testing a coating layer in the coated lithium-rich metal oxide material, a positive electrode plate, a battery and a power consuming device. The coated lithium-rich metal oxide material of the present application has a coating layer with high integrity and compactness, which reduces the dissolution of lithium, improves the capacity of the battery, and reduces the resistance of the material. The method of the present application can accurately and quickly test the integrity and compactness of the coating layer in the coated lithium-rich metal oxide material.