Positive Electrode Slurry Composition for Higher Coating Weight
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Solution Overview
Problem
Conventional methods to increase the coating weight of positive electrode plates in lithium-ion batteries lead to reduced yield and potential safety hazards, making it difficult to manufacture high-energy density batteries.
Innovation Solution
Incorporating a polyether siloxane with specific structural units into the positive electrode slurry to enhance the stability, flexibility, and dispersibility of the positive electrode plate, thereby allowing for increased coating weight without cracking or safety issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods are used to increase the coating weight of the positive electrode plate, then the energy density is improved, but the manufacturing yield decreases and safety hazards increase
Solution Approach 1:
The invention changes the chemical composition parameters of the slurry by introducing polyether siloxane with specific molecular weight ranges (10,000-60,000) and controlled structural unit proportions. This parameter change enables the coating to achieve higher weight while maintaining flexibility and preventing cracking, thereby resolving the contradiction between increasing coating weight and maintaining manufacturing yield
Solution Approach 2:
The invention creates a composite slurry system combining polyether siloxane with positive electrode active materials. The polyether siloxane acts as a flexible binder that forms a composite structure with the active materials, enabling the coating to withstand mechanical stress during manufacturing while achieving higher coating weights for improved energy density
2Quantity of substance
If conventional methods are used to increase the coating weight of the positive electrode plate, then the energy density is improved, but safety hazards increase
Solution Approach 1:
By changing the molecular weight parameters of the polyether siloxane to specific ranges (10,000-60,000) and controlling the proportions of structural units, the invention optimizes the flexibility and adhesion properties of the coating. This prevents cracking and structural failure during battery operation, thereby improving safety while enabling higher coating weights for enhanced energy density
3Quantity of substance
If the coating weight of the positive electrode plate is increased, then the energy density is improved, but the flexibility and stability of the plate deteriorate
Solution Approach 1:
The invention optimizes the molecular weight parameters of polyether siloxane (10,000-60,000) and controls the proportions of different structural units to achieve the optimal balance between flexibility and stability. This parameter optimization allows the plate to maintain its structural integrity and stability even at higher coating weights, enabling improved energy density without sacrificing plate stability
Data Source
AI summary
The present disclosure provides a positive electrode slurry comprising a polyether siloxane, wherein the polyether siloxane may comprise at least the following structural units:wherein D is methyl or ethyl; A is hydrogen, halogen or haloalkyl; B is hydroxyl, R, OR, or ROR′, wherein the R and R′ are each independently a linear or branched alkyl group containing 1 to 8 carbons; and E is phenyl, alkyl-substituted phenyl, ether-substituted phenyl, or halophenyl.