Negative Electrode Design for High-Density Lithium Batteries
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Summary
Problems
Rechargeable lithium batteries face challenges in maintaining structural integrity of the negative electrode active material during roll pressing, which affects the production of high-density electrode plates and overall battery performance.
Innovation solutions
A negative electrode active material comprising a core of amorphous carbon surrounded by multiple shells of crystalline and amorphous carbon, with a specific D/G ratio, is developed to enhance rollability and electrical conductivity, preventing structural collapse during processing.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conventional negative electrode active materials are used, then the electrode structure maintains simplicity, but structural collapse occurs during roll pressing
Why choose this principle:
The negative electrode active material is divided into core and shell portions, where the core contains the active material and the shell contains conductive carbon material. This segmentation prevents structural collapse during roll pressing while maintaining electrical conductivity, resolving the contradiction between structural integrity and material simplicity.
Principle concept:
If conventional negative electrode active materials are used, then the electrode structure maintains simplicity, but structural collapse occurs during roll pressing
Why choose this principle:
The patent creates a composite structure combining the negative electrode active material core with a conductive carbon shell. This composite material approach enhances structural stability during processing while improving electrical conductivity, addressing both the structural integrity and complexity concerns.
Application Domain
Data Source
AI summary:
A negative electrode active material comprising a core of amorphous carbon surrounded by multiple shells of crystalline and amorphous carbon, with a specific D/G ratio, is developed to enhance rollability and electrical conductivity, preventing structural collapse during processing.
Abstract
A negative electrode active material includes a core containing a first amorphous carbon and a shell on the core. The shell includes a first shell on the core, with the first shell including a crystalline carbon. The shell also includes a second shell on the first shell, with the second shell including a second amorphous carbon. A ratio of a D/G value of the core to a DIG value of the shell including the first shell and the second shell is about 1.4 to about 15.