Roughened Amorphous Carbon Coated Graphite for Battery Anodes
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Solution Overview
Problem
Conventional lithium secondary batteries face issues with reduced charge and discharge capacities due to excessive binder usage, leading to increased electrode resistance and poor adhesion, which affects the battery's performance and lifespan.
Innovation Solution
A negative electrode active material is developed with a core of natural graphite coated with a roughened amorphous carbon layer, enhancing adhesion and specific surface area, allowing for reduced binder usage while maintaining high loading and efficient lithium ion access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an excessive amount of binder is used in the negative electrode, then adhesion is improved, but electrode resistance increases
Solution Approach 1:
The invention changes the surface parameters of the graphite particles by forming an amorphous carbon layer and creating surface protrusions, which modifies the physical and chemical properties of the graphite surface to achieve better adhesion without increasing binder content
Solution Approach 2:
The invention creates a composite structure consisting of graphite particles coated with an amorphous carbon layer that has surface protrusions, combining the high capacity of graphite with the adhesive properties of the roughened carbon surface
2Quantity of substance
If a roughened surface is created on the graphite particles, then adhesion is improved and binder usage is reduced, but manufacturing complexity increases
Solution Approach 1:
The invention performs preliminary surface treatment of the graphite particles before electrode fabrication, creating the roughened amorphous carbon coating in advance so that the particles are ready for direct mixing with binder and conductive agents without requiring additional processing steps during electrode manufacturing
Solution Approach 2:
The invention replaces complex mechanical surface treatment methods with a chemical vapor deposition process that forms the amorphous carbon layer and surface protrusions through controlled chemical reactions, simplifying the manufacturing process
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 roughened surface of the negative electrode active material improves adhesion and increases the battery's output by anchoring effect and easy lithium ion access, preventing resistance increase and achieving high loading, thus enhancing the battery's performance and efficiency.
Implementation Method 1
improves adhesion and increases the battery's output by anchoring effect
Implementation Method 2
easy lithium ion access
Data Source
AI summary
Provided are a negative electrode active material and a method of preparing the same, and particularly, the present invention relates to a negative electrode active material including a core including natural graphite, and a shell surrounding the core and including a roughened amorphous carbon layer.Since the negative electrode active material according to the present invention has a roughened surface, adhesion may be improved by using a less amount of a binder due to an anchoring effect in which curved surfaces of active material particles in contact with each other are anchored. Thus, an increase in resistance due to the use of an excessive amount of the binder may be prevented while achieving high loading in a negative electrode.Also, since a specific surface area is increased due to the roughened surface, access of lithium ions becomes easy, and thus, high output of a battery may be obtained.