Phosphoric Acid Binder for Nonaqueous Battery Electrodes
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Solution Overview
Problem
Nonaqueous battery electrodes face challenges with low binding properties between active materials and collectors, leading to reduced capacity, high costs due to expensive solvents, and inadequate charge-discharge cycle performance, particularly in terms of elution resistance and swelling resistance to nonaqueous solvents.
Innovation Solution
A binder composition comprising a phosphoric acid group-containing ethylenically unsaturated monomer and surfactant, along with a neutralizing agent, is used to enhance the binding properties and cycle performance, with specific ratios of phosphorus atoms and surfactant content optimized for improved adhesion and cycle stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PVDF-based binder using NMP solvent is used, then binding property between active materials and collector is improved, but cost increases and work environment preservation deteriorates
Solution Approach 1:
The invention changes the solvent parameter from organic NMP to water, and modifies the binder composition by incorporating phosphoric acid group-containing monomers and surfactants. This parameter change maintains binding properties while eliminating the harmful effects of NMP on work environment and cost
Solution Approach 2:
The invention creates a composite binder system combining phosphoric acid group-containing ethylenically unsaturated monomer, surfactant, and neutralizing agent. This composite material approach achieves both good binding properties and environmental friendliness by synergistic combination of multiple components
2Object-affected harmful factors
If SBR-based aqueous dispersion is used, then cost decreases and work environment preservation improves, but binding property between active materials and collector deteriorates
Solution Approach 1:
The invention modifies the aqueous dispersion composition by adding phosphoric acid group-containing monomers and surfactants to the binder system. This changes the chemical parameters of the binder to achieve both good binding properties and environmental friendliness simultaneously
Solution Approach 2:
The phosphoric acid group-containing surfactant acts as an intermediary that bridges the hydrophobic active materials and the aqueous dispersion medium. The surfactant molecules with phosphoric acid groups provide both water solubility and adhesion to active materials, resolving the contradiction between aqueous formulation and binding performance
3Quantity of substance
If small amount of binder is used, then capacity increases, but binding property and cycle life deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters of the binder to include phosphoric acid group-containing monomers and surfactants, which significantly improve binding efficiency. This allows achieving good binding properties and cycle life with reduced binder amount, thereby increasing capacity
4Ease of manufacture
If conventional binder composition is used, then manufacturing simplicity is maintained, but charge-discharge cycle property deteriorates
Solution Approach 1:
The invention develops a composite binder composition containing phosphoric acid group-containing ethylenically unsaturated monomer, surfactant, and neutralizing agent. This composite material approach improves charge-discharge cycle property through enhanced elution and swelling resistance while maintaining manufacturing simplicity through straightforward mixing and processing
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 significantly improves the charge-discharge cycle property and life of nonaqueous batteries by enhancing elution resistance and swelling resistance, allowing for higher capacity and reduced solvent costs, making it suitable for various applications including electric vehicles.
Implementation Method 1
A binder composition essentially comprises (A) an ethylenically unsaturated monomer and (B) a surfactant... (a) a phosphoric acid group-containing ethylenically unsaturated monomer
Implementation Method 2
enhance the binding properties and cycle performance, with specific ratios of phosphorus atoms and surfactant content optimized for improved adhesion
Implementation Method 3
significantly improves the charge-discharge cycle property and life of nonaqueous batteries by enhancing elution resistance and swelling resistance
Data Source
AI summary
A binder composition for nonaqueous battery electrodes essentially contains (A) an ethylenically unsaturated monomer and (B) a surfactant, and further satisfies any two or more conditions of the following (I) to (III): (I) (A) the ethylenically unsaturated monomer includes (a) a phosphoric acid group-containing ethylenically unsaturated monomer; (II) (B) the surfactant comprises (b) a phosphoric acid group-containing surfactant; and (III) the composition including (C) a neutralizing agent containing an alkali metal compound and/or an alkali earth metal compound.