Modified Graphite With Bound Binder for Uniform Battery Anodes
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Solution Overview
Problem
The uneven distribution of binders in secondary battery negative electrodes, particularly styrene-butadiene rubber (SBR), leads to performance deterioration due to floating during the coating and drying processes, which existing methods only partially alleviate at the cost of reduced production efficiency.
Innovation Solution
A modified graphite with a binder moiety covalently linked to the graphite moiety, featuring a specific functional group structure, is used to improve dispersity and adhesion, eliminating the need for free-state binders and enhancing electronic conductivity and binding force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional binders (SBR) are used in negative electrodes, then the electrode structure is simple and easy to manufacture, but the binder distributes unevenly and floats during coating and drying, leading to performance deterioration
Solution Approach 1:
The patent merges the binder function directly into the graphite particles by covalently linking binder moieties to the graphite surface. This integration eliminates the separation between active material and binder, ensuring uniform distribution throughout the electrode structure and preventing floating during coating and drying processes.
Solution Approach 2:
The invention creates a composite structure where graphite particles are modified with binder moieties containing specific functional groups (carboxyl, hydroxyl, or amino groups). This composite approach combines the electrical conductivity of graphite with the adhesive properties of the binder, achieving both uniform distribution and enhanced battery performance.
2Manufacturing precision
If coating and drying processes are adjusted to alleviate binder floating, then binder distribution improves, but production efficiency decreases
Solution Approach 1:
The binder moieties are pre-attached to the graphite particles before electrode manufacturing. This preliminary action ensures that the binder is already in position and chemically bonded to the active material, eliminating the need for complex adjustments to coating and drying processes and maintaining high production efficiency.
3Strength
If free-state binders are used, then the electrode structure is simple, but adhesion and electronic conductivity are insufficient
Solution Approach 1:
The patent combines the binder and active material into a single integrated structure where the binder moiety is covalently linked to the graphite particle surface. This merging enhances adhesion strength and electronic conductivity without requiring separate free-state binder layers, thus avoiding significant structural complexity.
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 modified graphite ensures even binder distribution, enhances binding force, and improves storage and cycle performance of secondary batteries without compromising production efficiency.
Implementation Method 1
the modified graphite includes a graphite moiety and a binder moiety covalently linked to the graphite moiety
Data Source
AI summary
Graphite and a preparation method thereof, a secondary battery containing the modified graphite, a battery module, a battery pack, and an electrical device are provided. In particular, the modified graphite according to this disclosure includes a graphite moiety and a binder moiety covalently linked to the graphite moiety. The binder moiety possesses a structure expressed as Formula (IV´). The modified graphite according to this disclosure solves the problem that the binder floats up during the preparation of the negative electrode plate of the secondary battery.