Battery Binder Composition for Electrode Adhesion and Rate Capability
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Solution Overview
Problem
Conventional binder compositions for non-aqueous secondary batteries face challenges in ensuring sufficient adhesiveness and rate characteristics of electrode mixed material layers, leading to suboptimal performance in secondary batteries.
Innovation Solution
A binder composition comprising a polymer with specific functional groups and melamine cyanurate at a specific ratio, which enhances binding capacity and adhesiveness, forming functional layers that improve the rate characteristics of non-aqueous secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional binder compositions are used, then the battery structure is simple and easy to manufacture, but the adhesiveness of the electrode mixed material layer is insufficient and rate characteristics are poor
Solution Approach 1:
The patent applies composite materials by combining a fluorine-based polymer (providing basic binding and electrochemical stability) with a functionalized polymer containing carboxylic acid groups (providing enhanced adhesion through chemical bonding). This composite binder system achieves superior adhesiveness and rate characteristics while maintaining manufacturability, directly resolving the contradiction between performance improvement and complexity increase.
Solution Approach 2:
The patent employs parameter changes by optimizing the molecular weight, functional group content, and ratio of the functionalized polymer relative to the fluorine-based polymer. By adjusting these parameters, the binder composition achieves optimal balance between adhesiveness, conductivity, and processing characteristics, resolving the contradiction without excessive complexity.
2Productivity
If conventional binder compositions are used, then the manufacturing process is simple, but the rate characteristics of secondary batteries are insufficient
Solution Approach 1:
The composite binder system combines the high ionic conductivity of fluorine-based polymers with the strong adhesion and surface functionality of carboxylic acid-containing polymers. This composite structure enables improved rate characteristics by facilitating both ion transport and electrical contact, while the polymers maintain compatible processing characteristics for standard manufacturing methods.
3Reliability
If the amount of melamine compound is increased to improve binding capacity, then adhesiveness improves, but excess melamine compound may harm battery performance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the melamine compound content within the range of 0.5-85 parts by mass per 100 parts by mass of binder. This optimized parameter range ensures sufficient binding capacity and adhesiveness while preventing harmful effects on battery performance, such as excessive viscosity or electrochemical interference, thereby resolving the contradiction between binding strength and performance safety.
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 proposed binder composition significantly improves the adhesiveness and rate characteristics of secondary batteries by optimizing the ratio of melamine cyanurate to polymer, ensuring better electrode layer adhesion and conductivity while maintaining high battery performance.
Implementation Method 1
a binder composition which comprises a binder and a melamine compound, wherein an amount of the melamine compound is 0.5 parts by mass or more and 85 parts by mass or less per 100 parts by mass of the binder
Data Source
AI summary
Disclosed is a binder composition for non-aqueous secondary batteries which has an excellent binding capacity and which is capable of forming a functional layer which may improve the rate characteristics of non-aqueous secondary batteries. The binder composition comprises a binder and a melamine compound, wherein an amount of the melamine compound is 0.5 parts by mass or more and 85 parts by mass or less per 100 parts by mass of the binder.