Li-Ion Battery Binder Copolymer for Stronger Electrode Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lithium ion battery binders have high costs and poor bonding performance, which hinders the improvement of battery performance and increases costs, necessitating the development of cost-effective binders with enhanced bonding capabilities.
Innovation Solution
A binder comprising a copolymer with structural units derived from monomers containing a cyano group, an ester group, and a specific group, optimized in terms of molecular weight and composition to improve bonding and cycling performance while reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing binders are used in lithium ion batteries, then the battery can be manufactured, but the cost is high and bonding performance is poor
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by incorporating specific functional groups (cyano group, ester group, and the group shown in formula I) into the polymer structure. This parameter change in molecular structure leads to improved bonding performance while using cost-effective monomers that are not subjected to policy restrictions and can be mass-produced.
Solution Approach 2:
The patent creates a composite binder system by combining multiple structural units with different functional groups (cyano, ester, and the group in formula I) within the same polymer chain. This composite approach at the molecular level allows the binder to simultaneously achieve strong bonding performance and cost-effectiveness by leveraging the synergistic effects of different functional groups.
2Strength
If fluorine-containing monomers are used to improve bonding performance, then bonding strength increases, but cost increases and policy restrictions apply
Solution Approach 1:
The patent replaces expensive fluorine-containing monomers with cheaper alternative monomers containing cyano groups, ester groups, and the group shown in formula I. These alternative monomers are not subjected to policy restrictions and can be mass-produced at lower cost, while still achieving the required bonding performance through their functional group interactions.
Solution Approach 2:
The patent changes the chemical composition by substituting fluorine-containing monomers with non-fluorine-containing monomers that have different functional groups. This parameter change in monomer selection maintains bonding capability through alternative chemical mechanisms (cyano group coordination, ester group interactions) while eliminating cost and policy issues associated with fluorine-containing materials.
3Reliability
If the solid content of slurry is increased to improve electrode performance, then battery performance improves, but binder cost increases
Solution Approach 1:
The patent changes the cost parameter of the binder by using inexpensive monomers (cyano, ester, and formula I group containing monomers) that can be mass-produced without policy restrictions. This cost reduction in binder material allows for increased solid content in the slurry formulation, thereby improving electrode performance without being constrained by high binder costs.
Data Source
AI summary
The present application provides a binder and a preparation method therefor, a secondary battery, a battery module, a battery pack and a power consuming device. The binder may comprise a copolymer C, and the copolymer C may comprise a structural unit derived from a monomer containing a cyano group, a structural unit derived from a monomer containing an ester group, and a structural unit derived from a monomer containing a group shown in formula I, in which n is selected from 0, 1, 2, or 3: