Flexible Electrode Slurry Additive for Lithium-Ion Battery
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Solution Overview
Problem
Lithium-ion battery electrodes manufactured using water-based processes face challenges with flexibility due to poor dispersion of binders and electrode active material particles, leading to structural instability and increased risk of fracture, especially when bent, which degrades the battery's performance and lifetime.
Innovation Solution
Incorporating an additive into the electrode slurry that increases the distance between polymer chains in the binder, enhancing flexibility and electrochemical performance by reducing intermolecular forces and allowing for better dispersion in aqueous solvents, resulting in electrodes that remain smooth and flexible even at high surface densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water-based solvents are used instead of NMP, then environmental friendliness and cost are improved, but dispersion of binders and electrode active material particles deteriorates
Solution Approach 1:
The patent introduces a specific binder formulation with hydrophilic groups (carboxylic acid, hydroxyl, or amide groups) as an intermediary substance that enables effective dispersion of electrode active material particles in water-based solvents. This binder acts as a mediator between the hydrophobic electrode particles and the hydrophilic water solvent, resolving the dispersion problem while maintaining environmental benefits
Solution Approach 2:
The patent changes the chemical parameters of the binder by specifying functional groups (carboxylic acid, hydroxyl, or amide) that enhance water solubility and dispersion capability. This parameter change allows the binder to effectively disperse electrode materials in water-based solvents, overcoming the traditional limitation of aqueous systems
2Quantity of substance
If electrode coating density is increased to achieve higher output capacity, then energy density is improved, but flexibility and structural stability deteriorate
Solution Approach 1:
The patent changes the molecular structure parameters of the binder by incorporating hydrophilic functional groups and specifying molecular weight ranges (10,000-1,000,000 g/mol). These parameter changes create a binder that provides optimal adhesion and flexibility even at high coating densities, preventing electrode fracture while maintaining high energy density
3Productivity
If more electrode active material is used to achieve the same output capacity, then material efficiency is improved, but electrode thickness and inflexibility increase
Solution Approach 1:
The patent optimizes the binder's molecular weight (10,000-1,000,000 g/mol) and functional group composition to maintain electrode flexibility despite increased thickness from higher material loading. The enhanced binder formulation allows thicker electrodes to remain flexible and suitable for winding operations
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 additive significantly improves the flexibility and electrochemical performance of lithium-ion battery electrodes, reducing the risk of fracture and enhancing the battery's overall performance and lifespan.
Implementation Method 1
the additive significantly improves the flexibility and electrochemical performance of lithium-ion battery electrodes, reducing the risk of fracture and enhancing the battery's overall performance and lifespan
Data Source
AI summary
Provided is a slurry composition that can be used in manufacturing an electrode of a lithium-ion battery. The slurry composition comprises a binder, a solvent, an electrode active material, and an additive. The additive can be a compound described by the general formula (1). The binder is a copolymer comprising of one or more hydrophilic structural units and one or more hydrophobic structural units. The addition of the additive improves electrode flexibility significantly. A method to produce electrodes using this slurry is also disclosed. In addition, battery cells containing the electrode prepared using the slurry composition disclosed herein exhibit exceptional electrochemical performance.