Negative Electrode Plate with Binder-Coated Carbon Fiber Network
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Solution Overview
Problem
The negative active material layer in electrochemical devices is prone to detachment due to insufficient interaction forces, affecting the stability and kinetic performance of the electrode.
Innovation Solution
A negative electrode plate design incorporating conductive carbon fiber tubes with a linear binder adsorbed on their surface, forming a three-dimensional conductive network, enhances cohesive force and stability, thereby improving charge-and-discharge rate performance and cycle capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional negative active material layer is used, then manufacturing is simple, but the layer is prone to detachment and has poor stability
Solution Approach 1:
The patent uses a composite material system consisting of conductive carbon fiber tubes coated with linear binder, dispersed among negative active material particles. This composite structure provides both mechanical binding (through the binder-coated fibers) and electrical conductivity (through the carbon fiber network), resolving the contradiction between layer stability and structural complexity by integrating multiple functions into a single composite material system.
Solution Approach 2:
The linear binder coated on the conductive carbon fiber tube surface acts as an intermediary substance that bridges the negative active material particles and the carbon fiber network. This intermediary layer enhances adhesion between components while maintaining the conductive pathway, thereby improving layer stability without requiring complex multi-layer structures.
2Strength
If conductive carbon fiber tube with linear binder is added, then cohesive force and stability improve, but device complexity increases
Solution Approach 1:
The conductive carbon fiber tube with linear binder coating serves multiple functions simultaneously: it provides mechanical reinforcement and binding (strength), maintains electrical conductivity (through the carbon fiber), and prevents particle detachment (stability). This multi-functionality resolves the contradiction by achieving multiple performance improvements through a single added component rather than requiring separate elements for each function.
Solution Approach 2:
The linear binder is selectively applied only on the surface of the conductive carbon fiber tubes rather than throughout the entire electrode structure. This localized application provides targeted adhesion where needed (at particle-fiber interfaces) while minimizing overall material addition and structural complexity, thereby improving cohesive force without proportionally increasing device complexity.
3Productivity
If negative active material layer stability is improved, then charge rate performance improves, but manufacturing complexity increases
Solution Approach 1:
The linear binder on the conductive carbon fiber tube surface provides self-binding capability, where the binder naturally adheres to both the carbon fiber and negative active material particles during the mixing and coating process. This self-service binding mechanism reduces the need for additional complex manufacturing steps or specialized equipment, thereby improving charge rate performance through enhanced stability while maintaining relatively simple manufacturing processes.
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 design stabilizes the negative active material layer, reducing detachment and enhancing the electrochemical device's kinetic performance, including improved charge rate and cycle capacity retention.
Implementation Method 1
The linear binder is adsorbed on a surface of the conductive carbon fiber tube
Data Source
AI summary
A negative active material layer of the negative electrode plate includes a negative active material and a functional material. The functional material is distributed between particles of the negative active material. The functional material includes a conductive carbon fiber tube and a linear binder adsorbed on the surface of the conductive carbon fiber tube. The length of the conductive carbon fiber tube is L1, and L1 satisfies: 2 μm≤L1≤50 μm. Three points on the same conductive carbon fiber tube along the length direction of the conductive carbon fiber tube are consecutively selected and connected into a polyline to form a first angle α at a middle point of the three points as a vertex, satisfying: 30°≤α≤180°.