Polyaspartate Salt Dispersant for Li-Ion Battery Negative Electrodes
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Solution Overview
Problem
Lithium ion secondary batteries face issues with electrochemical performance, particularly cycle retention rate and discharge efficiency, due to the use of dispersants in their preparation process.
Innovation Solution
Incorporating polyaspartate salt, such as potassium polyaspartate, sodium polyaspartate, or barium polyaspartate, as a dispersant in the lithium ion secondary battery negative electrode additive, which improves the dispersion of active materials and enhances the adhesion to the metal foil, thereby improving electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dispersants are used in negative electrode paste preparation, then the paste can be prepared, but the electrochemical performance (cycle retention rate and discharge efficiency) deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the dispersant by specifying polyaspartate salt with particular molecular weight ranges (10,000-100,000) and purity levels (insoluble matter <30 wt%), thereby improving electrochemical performance while maintaining manufacturability
Solution Approach 2:
The patent uses polyaspartate salt as a composite dispersant material that combines dispersion functionality with improved adhesion properties, resolving the contradiction between ease of manufacture and electrochemical performance
2Reliability
If polyaspartate salt is added to improve dispersion and adhesion, then electrochemical performance improves, but the complexity of the additive composition increases
Solution Approach 1:
The polyaspartate salt serves multiple functions simultaneously: it acts as a dispersant for active materials, an adhesion promoter for metal foil, and a viscosity modifier, thereby improving electrochemical performance without significantly increasing compositional complexity
3Strength
If polyaspartate salt is used as dispersant, then adhesion to metal foil improves, but the cost of materials increases
Solution Approach 1:
The patent optimizes the concentration parameter of polyaspartate salt in the paste formulation, specifying it as 0.05-3 wt% based on active material weight, thereby achieving improved adhesion while controlling material costs
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 use of polyaspartate salt as a dispersant in the lithium ion secondary battery negative electrode additive leads to improved dispersity and adhesion, resulting in enhanced discharge capacity, charge-discharge efficiency, and capacity retention rate at both room temperature and low temperatures.
Implementation Method 1
improves the dispersion of active materials
Implementation Method 2
enhances the adhesion to the metal foil
Data Source
AI summary
A lithium ion secondary battery negative electrode additive includes polyaspartate salt and water.