Coated Lithium Cathode Material With Low-Water Cleaning
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Solution Overview
Problem
There is a need for rechargeable lithium batteries with higher energy density and capacity, particularly for applications in electric vehicles and power storage solutions, where existing positive electrode active materials do not meet the required performance standards.
Innovation Solution
A method of preparing a positive electrode active material involves the use of a lithium composite oxide represented by Chemical Formula 1, followed by wet coating and cleaning with washing water, and optionally incorporating sodium and sulfur in specific mass fractions, to enhance the material's properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of washing water is used to clean the coated lithium composite oxide, then the cleaning effect is improved, but the energy consumption and production cost increase
Solution Approach 1:
The patent changes the parameter of washing water amount from conventional large amounts to a controlled small amount (0-15 wt% based on coated lithium composite oxide weight). This parameter change achieves effective cleaning while significantly reducing energy consumption for water heating and processing, resolving the contradiction between cleaning quality and energy cost
2Quantity of substance
If the positive electrode active material is optimized for high energy density, then the battery capacity is improved, but the lifetime characteristics may deteriorate
Solution Approach 1:
The patent applies local quality by creating a coated structure on the lithium composite oxide surface. The coating layer (0.1-5 μm thickness) provides localized protection and functional enhancement, enabling the bulk material to maintain high energy density while the surface layer improves stability and lifetime characteristics through controlled composition and structure
Data Source
AI summary
A positive electrode active material, a method of preparing the same, a positive electrode including the same, and a rechargeable lithium battery including the positive electrode are provided. The positive electrode active material includes a lithium composite oxide, and a coating layer on a surface of the lithium composite oxide. The positive electrode active material further includes sodium (Na) and sulfur (S), wherein a mass fraction (S/Na) of the S to the Na is in a range of about 1 to about 3.