Layered Silicon-Graphite Anode Structure for Quick Charging Stability
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Solution Overview
Problem
Lithium secondary batteries face limitations in quick charging and thermal stability due to the characteristics of graphite-based anodes, which hinder improved performance and convenience.
Innovation Solution
A multi-layered anode structure is introduced, comprising a first layer with a mixture of natural and artificial graphite and a second layer containing a silicon-based compound, optimized in specific weight ratios and binders, to enhance adhesion and thermal stability, and improve quick charging characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural graphite is used in the anode to ensure adhesion and output characteristics, then adhesion and lifespan are improved, but quick charging performance deteriorates
Solution Approach 1:
The anode is divided into two distinct layers: a first anode active material layer containing natural graphite and artificial graphite for adhesion and output characteristics, and a second anode active material layer containing silicon-based compound and artificial graphite for quick charging performance. This segmentation allows each layer to optimize for its specific function without compromising the other.
Solution Approach 2:
Different regions of the anode are assigned different material compositions tailored to their specific functional requirements. The first layer near the current collector uses natural graphite mixture for adhesion, while the second layer uses silicon-based compound for enhanced charging rate, creating local optimization of properties throughout the structure.
2Reliability
If graphite-based anode materials are used to ensure electrochemical reaction potential and reversibility, then battery performance is improved, but thermal stability deteriorates
Solution Approach 1:
The anode employs a composite structure combining graphite-based materials (for electrochemical performance) with silicon-based compounds (for thermal stability). The silicon-based compound in the second layer compensates for the thermal instability of graphite while maintaining electrochemical reversibility, creating a material system with superior overall performance.
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 proposed anode structure significantly enhances thermal stability and quick charging capabilities of lithium secondary batteries, ensuring better performance and longevity.
Implementation Method 1
a second anode active material layer formed on the first anode active material layer and containing a silicon-based compound together with artificial graphite at a specific mixing ratio as the anode active material
Implementation Method 2
a first anode active material layer formed on at least one surface of the anode current collector and containing a mixture of natural graphite and artificial graphite in a weight ratio of 13 ̃34:66 ̃87
Data Source
AI summary
The present disclosure relates to an anode for a lithium secondary battery and a lithium secondary battery including the same, wherein the anode includes a first anode active material layer formed on at least one surface of the anode current collector, wherein the first anode active material layer contains a mixture of natural graphite and artificial graphite as the anode active material and a first binder; a second anode active material layer formed on the first anode active material layer, wherein the second anode active material layer contains a mixture of artificial graphite and a silicon-based compound as the anode active material and a second binder; and wherein a weight ratio of the first binder and the second binder is 1 to 2:1.