Aqueous Positive Electrode Binder With Self-Crosslinking Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current aqueous positive electrode binders for lithium batteries face issues with stability, cost, and environmental concerns due to the use of toxic solvents and expensive materials, leading to brittle electrodes and high production costs.
Innovation Solution
A novel aqueous binder is developed by copolymerizing functional monomers with dispersion, flexible, and self-cross-linkable groups, providing good dispersibility, flexibility, and self-cross-linking properties, which improves the processability and cyclic stability of the positive electrode plates while being environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PVDF binder is used with NMP solvent, then bonding performance is improved, but cost increases and environmental harm occurs
Solution Approach 1:
The patent replaces expensive PVDF binder with cheaper aqueous-based binder systems (such as carboxymethyl cellulose, starch, or polyacrylonitrile derivatives), eliminating the need for costly NMP solvent recovery processes while maintaining adequate bonding performance for battery electrodes
Solution Approach 2:
The patent converts the previously harmful NMP solvent system into a beneficial aqueous-based system where water serves as the solvent, eliminating toxicity concerns and enabling simpler, more environmentally friendly processing while reducing material costs
2Ease of manufacture
If aqueous binder is used to reduce cost, then material cost decreases, but electrode flexibility and processability worsen
Solution Approach 1:
The patent modifies the chemical structure of aqueous binders by introducing flexible side chains, adjusting molecular weight distributions, and controlling cross-linking densities to achieve optimal balance between flexibility and bonding strength, enabling electrodes to withstand rolling and winding processes without brittleness
Solution Approach 2:
The patent develops composite binder systems combining multiple polymer components (e.g., carboxymethyl cellulose with starch derivatives, or polyacrylonitrile with flexible additives) to synergistically improve both flexibility and adhesion properties while maintaining cost-effectiveness compared to PVDF
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 binder achieves superior peeling force, cyclic stability, and rate capability compared to traditional PVDF binders, is cost-effective, and environmentally friendly, making it suitable for large-scale replacement in lithium batteries.
Implementation Method 1
The binder is an aqueous positive electrode binder, which is obtained by copolymerizing a plurality of functional monomers
Implementation Method 2
The binder has the characteristics of good dispersibility, good self cross-linking, strong bonding performance and good flexibility
Data Source
AI summary
Disclosed are a binder and a battery including the binder. The novel aqueous binder with self cross-linking performance, strong bonding performance, and good flexibility is obtained by copolymerizing a plurality of functional monomers. The binder has the characteristics of good processability and high solid content of the slurry when applied to a positive electrode; the positive electrode plate obtained by applying the slurry has high peeling force and good cyclic stability, and its rate capability is superior to that obtained by applying PVDF binder; and the binder is green and environmental friendly, and it is expected to replace PVDF in batteries and achieve large-scale application.