Binder Composition for Non-Aqueous Battery Electrodes
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Solution Overview
Problem
Conventional binder compositions for non-aqueous secondary battery electrodes suffer from insufficient viscosity stability and electrolyte solution resistance, leading to electrode mixed material layer elution and deteriorated high-temperature storage characteristics.
Innovation Solution
A binder composition incorporating a polymer with functional groups bondable to cationic groups, specifically carboxylic acid, sulfonate, or phosphate groups, combined with an organic compound containing at least two cationic groups like polyethyleneimine, which enhances viscosity stability and electrolyte solution resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional binder compositions are used, then the electrode mixed material layer can be formed, but the viscosity stability is insufficient and the layer easily elutes into electrolyte solution
Solution Approach 1:
The patent combines a polymer with functional groups (carboxylic acid, sulfonate, or phosphate groups) and an organic compound with cationic groups (polyethyleneimine or its derivatives) to create a composite binder system. This composite approach allows the functional groups to interact with the cationic groups, forming a network structure that simultaneously improves viscosity stability and electrolyte solution resistance, resolving the contradiction between these two properties.
Solution Approach 2:
The patent modifies the chemical parameters of the binder composition by introducing specific functional groups that can bond with cationic groups. This chemical parameter change enables the formation of a crosslinked or networked structure, which fundamentally alters the physical properties of the binder, leading to improved viscosity stability and reduced elution into electrolyte solution.
2Reliability
If conventional binder compositions are used, then the electrode can be manufactured, but the high-temperature storage characteristics deteriorate
Solution Approach 1:
The composite binder system combining polymers with functional groups and cationic organic compounds creates a more robust structure that maintains integrity at high temperatures. This composite approach improves high-temperature storage characteristics while keeping the manufacturing process compatible with conventional electrode production methods, thus resolving the contradiction between reliability and ease of manufacture.
3Strength
If the binder composition is optimized for viscosity stability, then the electrode mixed material layer adheres well to the current collector, but the electrolyte solution resistance is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the binder by introducing functional groups that can form bonds with cationic groups. This parameter change creates a dual-function binder that provides both strong adhesion to the current collector and resistance to elution into electrolyte solution, thereby resolving the contradiction between close adherence and electrolyte solution resistance.
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 composition effectively inhibits electrode mixed material layer elution and improves high-temperature storage characteristics of non-aqueous secondary batteries by forming a rigid network that maintains stability and adhesion.
Implementation Method 1
a polymer including a functional group that is bondable with a cationic group
Implementation Method 2
forming a rigid network that maintains stability and adhesion
Data Source
AI summary
Provided is a binder composition for a non-aqueous secondary battery electrode that has excellent viscosity stability and can form an electrode mixed material layer having excellent electrolyte solution resistance. The binder composition for a non-aqueous secondary battery electrode contains a polymer including a functional group that is bondable with a cationic group and an organic compound including at least two cationic groups.