Composite Binder Particles for Longer-Cycle Battery Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a demand for binders in non-aqueous secondary batteries that can improve the cycle characteristics of electrodes, as existing binders do not adequately enhance the performance of non-aqueous secondary batteries in terms of output, capacity, and longevity.
Innovation Solution
The development of composite particles comprising a copolymer with a nonionic compound having one ethylenically unsaturated bond and a compound with a carboxy group and one ethylenically unsaturated bond, combined with a tackifier, which are used to form electrodes with improved binding properties between electrode active materials and a current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional binders are used in non-aqueous secondary batteries, then the basic electrode structure is maintained, but the cycle characteristics and battery longevity are insufficient
Solution Approach 1:
The invention uses composite particles comprising a copolymer and a tackifier as binder material. The copolymer contains specific structural units (first structural unit from nonionic compound with one ethylenically unsaturated bond, second structural unit from compound with carboxy group and one ethylenically unsaturated bond) that work synergistically with the tackifier to improve both cycle characteristics and battery longevity, resolving the contradiction between reliability and duration of action.
2Strength
If existing binder compositions are used, then electrode assembly is straightforward, but binding properties between electrode active materials and current collector are inadequate
Solution Approach 1:
The invention specifies precise compositional parameters for the copolymer (ratios of first and second structural units, specific monomer types) and tackifier content to optimize binding properties. By controlling these parameters within defined ranges, the binder achieves superior adhesion between electrode active materials and current collector while maintaining ease of manufacture through standardized production processes.
3Power
If higher performance binders are developed to improve output and capacity, then battery performance increases, but the complexity of binder composition and production increases
Solution Approach 1:
The invention introduces functional differentiation within the binder system by combining copolymer chains with specific local functional groups (carboxy groups in second structural units) and tackifier components. This local quality enhancement at molecular level improves overall battery power and capacity output while the modular composition structure keeps production complexity manageable through established polymerization and mixing 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 composite particles and binder composition result in non-aqueous secondary batteries with excellent cycle characteristics, providing better electrode binding and longer battery life.
Implementation Method 1
a binder that binds an active material together and binds an active material to a current collector to fix the electrode active material layer on the current collector
Data Source
Figure 1~2
Figure 3
AI summary
Composite particles are provided, including: a copolymer; and a tackifier, in which the copolymer has a first structural unit derived from a monomer (a1) and a second structural unit derived from a monomer (a2), the monomer (a1) is a nonionic compound having only one ethylenically unsaturated bond, and the monomer (a2) is a compound having a carboxy group and only one ethylenically unsaturated bond.