Binder Composition for Secondary Battery Electrodes
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Solution Overview
Problem
Conventional binder compositions for secondary battery electrodes often lead to aggregation of conductive materials, hindering their uniform dispersion and resulting in increased cell resistance and reduced output characteristics.
Innovation Solution
A binder composition with a polymer having a specific terminal structure, combined with a solvent, is used to facilitate the dispersion of conductive materials in the slurry composition, ensuring improved dispersibility and electrode uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional binder compositions are used in slurry composition, then the binder provides basic binding function, but the conductive material aggregates and dispersibility deteriorates
Solution Approach 1:
The invention modifies the chemical structure of the binder polymer by introducing specific functional groups (carboxyl groups with predetermined content and ratio) to change its interaction parameters with conductive materials. This structural parameter change enables the binder to disperse conductive materials effectively while maintaining binding function, resolving the contradiction between basic binding and dispersibility.
Solution Approach 2:
The invention creates a composite binder system by combining specific polymers with defined carboxyl group content and ratio. This composite approach integrates multiple functional components within the binder structure, enabling simultaneous achievement of binding function and conductive material dispersibility that single-component binders cannot provide.
2Reliability
If conductive material is added to electrode mixed material layer, then electrical contact is improved, but uniform dispersion becomes difficult due to aggregation
Solution Approach 1:
The binder with specific carboxyl group content acts as an intermediary substance between conductive materials and the electrode matrix. This intermediary binder facilitates uniform distribution of conductive materials throughout the electrode mixed material layer, preventing aggregation and ensuring both electrical contact and manufacturing uniformity.
3Ease of manufacture
If conductive material aggregates in slurry composition, then application is simplified, but cell resistance increases and output characteristics reduce
Solution Approach 1:
By changing the chemical parameters of the binder (introducing specific carboxyl groups with controlled content and ratio), the invention improves conductive material dispersibility in the slurry composition. This parameter change ensures uniform distribution of conductive materials, reducing cell resistance and improving output characteristics while maintaining ease of application.
Data Source
AI summary
A binder composition for a secondary battery including a polymer having a structure represented by the following formula (I) at a terminal thereof; and a solvent,[in Formula (I), R1 and R2 each independently represents an organic group or an organic group in which R1 and R2 together form a ring, and * represents a binding site to the terminal of a main chain of the polymer].