Anode Active Material Coating for Lithium Battery Swelling
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Solution Overview
Problem
The rechargeable lithium battery market demands a high-stability anode active material for low-temperature applications, and existing ceramic coating methods face challenges with non-uniform coating and ceramic coagulation, affecting battery reliability and performance.
Innovation Solution
A method involving the mixing of a carbon-based active material with a low crystalline carbon material and ceramic, followed by heat treatment, to create a uniformly coated anode active material, using mechanical mixing and specific temperature ranges to enhance binding and prevent ceramic coagulation, thereby improving electrochemical and safety characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramic coating is applied to carbon-based active material, then thermal stability and cycle life are improved, but coating uniformity deteriorates and ceramic coagulation occurs
Solution Approach 1:
The patent applies preliminary action by coating the carbon-based active material with a binder material before applying the ceramic coating. This preliminary binder layer prevents ceramic coagulation and ensures uniform distribution of ceramic particles, thereby achieving both improved cycle life and uniform coating without the drawbacks of direct ceramic application.
2Ease of manufacture
If simple mixing method is used, then manufacturing complexity is reduced, but coating uniformity and ceramic distribution deteriorate
Solution Approach 1:
The patent uses a binder material as an intermediary substance between the carbon-based active material and the ceramic coating. This binder mediates the mixing process, enabling simple mechanical mixing to achieve uniform ceramic distribution and coating while maintaining process simplicity. The binder ensures proper adhesion and uniform dispersion without requiring complex mixing equipment or procedures.
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 method improves long-term reliability and resistance by suppressing battery swelling, enhancing electrochemical and safety characteristics, and achieving higher cycle life and discharge performance.
Implementation Method 1
performing a heat treatment
Implementation Method 2
performing first mixing to mix a carbon-based active material with a low crystalline carbon material; performing second mixing to mix the mixture of the carbon-based active material and the low crystalline carbon material with a ceramic
Data Source
AI summary
Disclosed is a method for preparing an electrode active material for a rechargeable lithium battery, including: performing first mixing to mix a carbon-based active material with a low crystalline carbon material; performing second mixing to mix the mixture of the carbon-based active material and the low crystalline carbon material with a ceramic; and performing a heat treatment, an electrode for a rechargeable lithium battery including the electrode active material for the rechargeable lithium battery prepared by the method, and a rechargeable lithium battery.