Li-S-O Coated Ternary Cathode Material for Lower Resistance Growth
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Solution Overview
Problem
Current lithium-ion battery electrode active materials face limitations in performance, particularly in terms of specific capacity, cycling performance, direct current resistance, and gas production, necessitating the development of more effective materials.
Innovation Solution
A new electrode active material is introduced, featuring a coating layer composed of a reaction product between a sulfur-containing compound and a lithium-containing compound, including elements Li, S, and O, applied to a ternary material core, which reduces direct current resistance growth during cycling and enhances battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode active materials are used, then manufacturing simplicity is maintained, but cycling performance and specific capacity are insufficient
Solution Approach 1:
The patent applies composite materials by creating a core-shell structure where a ternary material core is coated with a reaction product layer containing Li, S, and O elements. This composite structure combines the high capacity benefits of ternary materials with the protective and performance-enhancing properties of the sulfur-containing coating, thereby improving cycling performance while maintaining manufacturing feasibility through a systematic coating process
2Reliability
If electrode active materials with higher capacity are developed, then specific capacity improves, but direct current resistance growth during cycling increases
Solution Approach 1:
The patent applies local quality by modifying only the surface region of the electrode active material while keeping the bulk ternary material composition intact. The coating layer with Li, S, and O elements is formed locally on the surface to reduce direct current resistance growth during cycling, allowing the interior material to maintain high capacity while the surface provides improved electrical conductivity and stability
3Object-generated harmful factors
If conventional coating methods are used, then manufacturing process simplicity is maintained, but gas production during battery operation increases
Solution Approach 1:
The patent applies self-service by utilizing the inherent reactivity between the sulfur-containing compound and lithium-containing compound on the material surface to form the desired coating layer. The coating process leverages the natural chemical reactions and heat treatment steps that are already part of the material synthesis, eliminating the need for separate complex coating equipment or procedures while effectively reducing gas production
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 electrode active material with a sulfur-containing and lithium-containing coating layer exhibits improved specific capacity, cycling performance, reduced direct current resistance, lower gas production, and better performance at higher voltages, while maintaining stability in high humidity environments.
Implementation Method 1
the coating layer includes a reaction product of a sulfur-containing compound and a lithium-containing compound
Data Source
AI summary
The present invention relates to an electrode active material, a preparation method thereof, an electrode, a battery, and an apparatus. The electrode active material includes: a core and a coating layer, where the core includes a ternary material, the coating layer coats the core, the coating layer includes a reaction product of a sulfur-containing compound and a lithium-containing compound, and the reaction product includes element Li, element S, and element O.