Li-M-F Coated Cathode Material for Lower Battery Resistance
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Solution Overview
Problem
Existing lithium-ion batteries face high internal resistance due to oxidation reactions of the electrolyte, which are not effectively addressed by conventional methods.
Innovation Solution
A coated active material is developed by applying a compound containing Li, M, and F to the surface of the positive electrode active material, with a specific F content range of 10 to 280 mg/m², balancing resistance reduction and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is applied to the positive electrode active material to reduce internal resistance, then the internal resistance decreases, but the device complexity increases due to additional coating steps and material composition control
Solution Approach 1:
The patent applies a composite coating layer containing Li, M, and F elements on the positive electrode active material surface. This composite material structure simultaneously achieves resistance reduction while protecting the electrode, resolving the contradiction between improving reliability and managing device complexity through material science rather than complex process design
Solution Approach 2:
The patent optimizes specific parameters including the amount of F (10-280 mg/m²), Li (0.1-5.0 mmol/m²), and M (0.1-5.0 mmol/m²) in the coating layer. By precisely controlling these compositional parameters, the coating achieves effective resistance reduction while maintaining manufacturability, resolving the contradiction between performance improvement and process complexity
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 coating significantly reduces internal battery resistance and enhances durability while maintaining sufficient electronic conductivity.
Implementation Method 1
the coating layer includes a compound including Li, M, and F... can reduce the internal resistance of a battery
Data Source
AI summary
A coated active material according to the present disclosure includes: a positive electrode active material; and a coating layer coating at least a portion of a surface of the positive electrode active material. The coating layer includes a compound including Li, M, and F. In the compound, the M is at least one element selected from the group consisting of metalloid elements and metal elements other than Li. An amount of F in the compound per unit surface area of the positive electrode active material is 10 mg/m2 or more and 280 mg/m2 or less.