Polyvinyl Alcohol Binder Adhesion and Stability in Non-Aqueous Batteries
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Solution Overview
Problem
Current binder compositions for non-aqueous electrolyte batteries face challenges such as low adhesion properties, high electrical resistance, poor flexibility, and instability, which affect the performance and longevity of portable terminals.
Innovation Solution
A binder composition comprising polyvinyl alcohol, a copolymer of vinyl alcohol and ethylenically unsaturated carboxylic acid, and a neutralized salt, along with an amino acid, carboxylic acid-containing polymer, or polyamine, is used to enhance adhesion, stability, and charge/discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If diene-based rubber (SBR) is used as binder with CMC-Na thickener, then adhesion to current collector can be improved, but the binder system becomes complex and storage stability decreases
Solution Approach 1:
The patent extracts and eliminates the CMC-Na thickener component from the binder system, using only polyvinyl alcohol as the binder. This simplifies the binder system from a two-component system (SBR+CMC-Na) to a single-component system (polyvinyl alcohol), while maintaining adhesion performance through the specific molecular structure and functional groups of polyvinyl alcohol.
Solution Approach 2:
The patent uses polyvinyl alcohol as a composite material that inherently provides both binding and thickening functions. The polymer's molecular structure, containing hydroxyl groups and carbonyl groups, allows it to form strong interactions with both the current collector and active material particles, replacing the need for separate binder and thickener components.
2Strength
If diene-based rubber (SBR) is used as binder, then adhesion property can be enhanced, but heat resistance and capacity retention ratio deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the binder from diene-based rubber to polyvinyl alcohol. This parameter change fundamentally alters the thermal stability and electrochemical compatibility of the binder system. Polyvinyl alcohol's molecular structure provides superior heat resistance and maintains capacity retention ratio at high temperatures, while still achieving adequate adhesion through its functional groups.
3Strength
If acrylic binder or polyamide/imide-based binder is used, then adhesion property is improved, but electrical resistance increases and flexibility deteriorates
Solution Approach 1:
The patent applies local quality by using polyvinyl alcohol's specific functional groups (hydroxyl and carbonyl groups) at the interface with the current collector and active material to provide adhesion, while the bulk polymer structure maintains electrical conductivity and flexibility. This localized functional group interaction allows strong adhesion without compromising the overall electrical properties of the electrode.
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 improves adhesion to current collectors, enhances slurry stability, and achieves high charge/discharge efficiency, addressing the limitations of existing binders by providing better mechanical strength and flexibility.
Implementation Method 1
The proposed binder composition improves adhesion to current collectors
Implementation Method 2
a neutralized salt of the copolymer, and (C) at least one selected from an amino acid, a carboxylic acid-containing polymer, and a polyamine
Data Source
AI summary
The present invention relates to a binder composition for a non-aqueous electrolyte battery, which is characterized by containing (A) polyvinyl alcohol, (B) at least one selected from a copolymer of vinyl alcohol and ethylenically unsaturated carboxylic acid and a neutralized salt of the copolymer and (C) at least one selected from an amino acid, a carboxylic acid-containing polymer and a polyamine; and a binder aqueous solution for a non-aqueous electrolyte battery, a slurry composition for a non-aqueous electrolyte battery, an electrode for a non-aqueous electrolyte battery, and a non-aqueous electrolyte battery, each containing the binder composition; and others.