Conductive Binder Composition for Carbon Black Agglomeration in Batteries
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Solution Overview
Problem
The agglomeration of conductive agents like carbon black in secondary battery electrode plates during the preparation process leads to non-uniform distribution, affecting internal resistance, storage, and cycle performance, and current solutions using dispersing agents either fail to improve performance or complicate the process and increase costs.
Innovation Solution
A binder compound with a specific structure is used for surface grafting modification of carbon-based conductive agents, preventing agglomeration and improving binding and conductive properties, thereby enhancing the uniform distribution and performance of secondary batteries without compromising overall performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a dispersing agent is incorporated to alleviate conductive agent agglomeration, then the uniform distribution of conductive agent is improved, but the battery performance deteriorates and process complexity increases
Solution Approach 1:
The patent uses a binder compound as an intermediary substance that simultaneously achieves uniform distribution of conductive agent and maintains battery performance. The binder compound acts as a mediator between the conductive agent particles and the electrode plate material, preventing agglomeration through its molecular structure while avoiding the adverse effects of conventional dispersing agents.
Solution Approach 2:
The invention employs a composite binder compound structure that combines multiple functional groups (carboxyl, hydroxyl, amino groups) within a single molecular framework. This composite structure enables the binder to perform multiple functions: dispersing conductive agents uniformly, maintaining electrical conductivity, and preserving battery performance, thereby eliminating the need for separate dispersing agents.
2Stability of the object's composition
If a dispersing agent is incorporated to alleviate conductive agent agglomeration, then the uniform distribution of conductive agent is improved, but the process complexity and cost increase
Solution Approach 1:
The binder compound is designed with multi-functionality, serving both as a binding agent and a dispersing agent simultaneously. By incorporating multiple functional groups (carboxyl, hydroxyl, amino) into a single molecular structure, the binder can perform dispersion, binding, and conductivity maintenance functions, thereby simplifying the preparation process and reducing the number of required additives.
Solution Approach 2:
The patent merges the functions of the binder and dispersing agent into a single binder compound. Instead of using separate substances for binding and dispersing, the invention combines these functionalities into one compound with multiple functional groups, thereby reducing process complexity and eliminating the need for separate dispersing agent incorporation steps.
3Ease of manufacture
If the conductive agent is used without surface modification, then the process is simple, but the conductive agent agglomerates during stirring
Solution Approach 1:
The patent applies preliminary surface modification to the conductive agent by using the binder compound to coat or graft onto the conductive agent particles before electrode plate preparation. This preliminary action of surface modification prevents agglomeration during subsequent stirring and processing steps, while the binder compound's structure ensures uniform distribution is achieved during the same preparation 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 binder compound effectively addresses the agglomeration issue, improving storage and cycle performance of secondary batteries by ensuring uniform distribution of conductive agents, while maintaining comprehensive battery performance without increasing costs or complexity.
Implementation Method 1
The binder compound of the present disclosure can be used to for performing surface grafting modification for carbon-based conductive agent particles
Implementation Method 2
improves the dispersibility of conventional carbon-based conductive agents, and avoids the agglomeration
Data Source
AI summary
A binder compound, a conductive binder, and a secondary battery containing the same are provided. In some embodiments, the binder compound of the present disclosure has a structure of formula (I), where R1 and R2 each independently represent a straight or branched C1-12 alkyl; R3 represents a halogen or cyano group; R4 represents a hydroxymethyl or amino; Z represents a straight or branched C1-12 alkylene; and m represents an integer selected from 7600-47000. The binder compound and the conductive binder of the present disclosure can improve the storage and cycle performances of the secondary battery.