Acrylic Anode Slurry Composition for Silicon Electrode Expansion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Secondary battery anodes using silicon active materials face challenges with repeated shrinkage and expansion during charge and discharge, leading to material deterioration, electrode structure damage, and loss of conductive pathways.
Innovation Solution
An anode slurry composition is developed, comprising an anode active material and an acrylic polymer with specific monomer units, such as carboxylic acid-containing, hydroxyl group-containing, and unshared electron pair-containing monomer units, which enhances binding force between active materials and adhesive force to the current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If silicon active material is used to increase capacity, then the theoretical capacity is improved, but the electrode structure deteriorates due to repeated expansion and shrinkage
Solution Approach 1:
The invention divides the electrode structure into multiple functional layers: an active material layer containing silicon particles, a binder layer with specific polymer components, and a current collector. This segmentation allows each layer to perform its specific function - the binder layer absorbs expansion stress while the current collector maintains structural integrity, resolving the contradiction between high capacity and structural stability
Solution Approach 2:
The invention uses composite materials comprising silicon active material particles combined with specific binder materials (polymer compounds with carboxylic acid groups and hydroxyl groups). This composite structure enables the binder to chemically interact with both the silicon particles and current collector, creating a stable composite that withstands repeated expansion-shrinkage cycles while maintaining high capacity
2Ease of manufacture
If conventional binders are used, then the manufacturing process is simple, but the binding force between active materials and adhesive force to current collector are insufficient
Solution Approach 1:
The invention changes the chemical parameters of the binder material by selecting polymer compounds with specific functional groups (carboxylic acid groups and hydroxyl groups). These parameter changes enable strong chemical bonding between the binder and both active materials and current collector, significantly improving binding and adhesive forces while maintaining ease of manufacture through conventional slurry preparation and coating processes
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 anode slurry composition effectively manages the shrinkage and expansion of silicon anodes, improving the binding force between active materials and the adhesive force to the current collector, thereby enhancing the cycle stability and performance of lithium ion secondary batteries.
Implementation Method 1
secure binding force between active materials and excellent adhesive force to a current collector
Data Source
AI summary
An anode slurry composition that can be applied to the production of anodes to cope with shrinkage and expansion by repeated charge and discharge. The anode slurry composition also provides an excellent binding force between active materials and adhesive force to a current collector. An anode and a secondary battery comprising the anode slurry composition are also provided.