Current Collector Surface Treatment Composition for Stronger Electrode Bonding
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Solution Overview
Problem
Current surface treatment methods for current collector foils in secondary batteries are limited, leading to inadequate improvements in surface properties and bonding strength between the current collector and active material layers, which affects the energy density, cycle performance, and safety of batteries.
Innovation Solution
A surface treatment composition comprising polycaprolactone modified with an acidic group and/or its salt, combined with polyether-modified polyolefin acid, polyether-modified polyalkenoate salt, or polyether-modified polyalkenoate ester, is applied to form an intermediate layer on the current collector, enhancing bonding strength and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-ingredient surface treatment agent is applied to the current collector, then the surface treatment process is simple, but the bonding strength and surface properties improvement is limited
Solution Approach 1:
The patent applies a composite surface treatment composition containing multiple ingredients: a first ingredient (polycaprolactone or its copolymer) and a second ingredient (polymer binder such as CMC, SBR, or PVDF). This composite formulation works synergistically to significantly improve bonding strength between the current collector and active material, overcoming the limitation of single-ingredient treatments while maintaining process simplicity.
2Strength
If the bonding strength between current collector and active material is improved, then the electrode performance is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines multiple functional ingredients into a single integrated surface treatment composition that can be applied in one step. The first ingredient (polycaprolactone-based) provides adhesion promotion, while the second ingredient (polymer binder) ensures mechanical strength and stability. This merged formulation simplifies the manufacturing process compared to sequential treatments, while achieving superior bonding performance.
3Strength
If polycaprolactone modified with acidic groups is used as surface treatment agent, then the bonding force between current collector and active material layer is improved, but the cost of materials increases
Solution Approach 1:
The patent modifies polycaprolactone by introducing acidic groups (such as carboxylic acid groups) to enhance its bonding capability with active materials. This chemical modification changes the surface interaction parameters, enabling stronger adhesion through electrostatic and chemical interactions. The controlled modification level balances performance improvement with material cost considerations.
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 treatment composition significantly improves the bonding force and tensile performance of the electrode, preventing binder segregation during drying and enhancing overall battery performance.
Implementation Method 1
the surface treatment composition can form an intermediate layer after being applied to a surface of a current collector foil. The intermediate layer can effectively enhance performance of bonding between the current collector foil and an active material layer
Implementation Method 2
the first ingredient is a polycaprolactone modified with an acidic group and/or with a salt of the acidic group... the surface treatment composition can improve the bonding force between the current collector foil and the active material layer
Data Source
AI summary
A surface treatment composition includes, expressed as parts by weight, a first ingredient of 1 to 30 parts and a second ingredient of 1 to 30 parts. The first ingredient is a polycaprolactone modified with an acidic group and/or a salt of the acidic group. The second ingredient is selected from polyether-modified polyolefin acid, polyether-modified polyalkenoate salt, polyether-modified polyalkenoate ester, or a combination thereof.