Electrode Forming Composition for Stable Battery Slurry Adhesion
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Solution Overview
Problem
Existing electrode formation compositions face challenges with slurry stability, adhesion to metal foils, and conductivity, particularly when using fluororesins with conventional organic solvents, leading to insufficient performance in lithium ion batteries.
Innovation Solution
A composition incorporating a copolymer with a vinylidene fluoride unit and another monomer, combined with a solvent represented by a specific chemical formula, enhances slurry stability, adhesion, and conductivity, resulting in improved battery performance with high temperature storage capacity retention and reduced gas generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional organic solvents are used with fluororesins for electrode formation, then the electrode can be formed, but the slurry stability is insufficient and adhesion to metal foils is poor
Solution Approach 1:
The patent changes the chemical parameters of the solvent system by introducing a specific carboxylic acid solvent (formula 1) with defined molecular structure characteristics (total carbon atoms ≥6, at least one carbonyl group). This parameter change in solvent chemistry resolves the contradiction by simultaneously improving slurry stability and adhesion properties that were insufficient with conventional organic solvents.
Solution Approach 2:
The patent creates a composite binder system combining the copolymer (containing vinylidene fluoride and other monomers) with the specific carboxylic acid solvent. This composite material approach achieves synergistic effects where the polymer-solvent combination provides both excellent slurry stability and strong adhesion to metal foils, overcoming the limitations of using either component alone.
2Reliability
If fluororesins are used as binders, then electrode formation is achieved, but conductivity and flexibility are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the binder by using a copolymer containing vinylidene fluoride units combined with specific carboxylic acid solvents. This compositional parameter change enhances both electrical conductivity and flexibility of the electrode, addressing the insufficiencies of conventional fluororesin binders.
3Reliability
If conventional electrode formation methods are used, then electrodes can be produced, but temperature storage capacity retention is poor and gas generation is excessive
Solution Approach 1:
The patent changes the chemical parameters of the electrode formation composition by introducing the specific carboxylic acid solvent (formula 1) and copolymer combination. This compositional parameter change leads to improved thermal stability and reduced gas generation during battery operation, while enhancing temperature storage capacity retention.
Solution Approach 2:
The patent converts the potential harmful effects of conventional solvent-polymer combinations (which cause gas generation and poor thermal stability) into benefits by selecting a specific carboxylic acid solvent and copolymer pairing. This selection transforms the electrode formation process to minimize harmful byproducts while maximizing thermal performance.
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 composition enables the formation of electrodes with excellent flexibility and conductivity, maintaining high temperature storage capacity and minimizing resistance increase, while reducing gas generation volume.
Implementation Method 1
an electrode can be formed, for example, by dissolving an electrode material and a binder in a solvent
Implementation Method 2
the composition for electrode formation has excellent slurry stability
Implementation Method 3
can form a coating layer that is firmly adhered to a metal foil
Implementation Method 4
has excellent flexibility and conductivity
Implementation Method 5
can realize a battery that has a high temperature storage capacity retention rate
Implementation Method 6
has a small gas generation volume
Data Source
AI summary
Provided is a composition for electrode formation comprising a copolymer comprising vinylidene fluoride unit and a unit of an other monomer other than vinylidene fluoride, and a solvent represented by a general formula (1): NR1R2R3 wherein R1, R2, and R3 are each independently H or a monovalent substituent, provided that the total number of carbon atoms of R1, R2, and R3 is 6 or more, and at least one of R1, R2, and R3 is an organic group having carbonyl group; and any two of R1, R2, and R3 optionally bond to each other to form a ring.