Conductive-Coated Current Collector for Corrosion and Interface Loss
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Solution Overview
Problem
Current lithium-ion battery electrodes face issues such as corrosion of the current collector due to the use of nickel-containing cathode active materials in water-based slurries and high interfacial resistance between the electrode layer and the current collector, leading to poor electrochemical performance.
Innovation Solution
A modified current collector with a conductive layer comprising a binder material and a copolymer is used, which acts as a physical barrier to prevent corrosion and reduces interfacial resistance, enhancing electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water-based slurry is used for manufacturing lithium-ion battery electrodes, then environmental friendliness and safety are improved, but corrosion of the current collector occurs due to reaction with nickel-containing cathode active materials
Solution Approach 1:
The patent introduces a protective coating layer as an intermediary between the water-based slurry and the current collector substrate. This coating acts as a mediator that prevents direct contact and chemical reaction between the basic water-based slurry (containing nickel-containing cathode active materials) and the current collector, thereby eliminating corrosion while maintaining the environmental benefits of water-based processing
Solution Approach 2:
The patent employs composite material structure consisting of the current collector substrate combined with a protective coating layer. This composite structure integrates the electrical conductivity of the metal current collector with the corrosion resistance of the coating material, allowing the system to withstand the corrosive environment of water-based slurries while maintaining functional performance
2Ease of manufacture
If conventional current collector is used, then manufacturing simplicity is maintained, but high interfacial resistance between electrode layer and current collector leads to poor electrochemical performance
Solution Approach 1:
The patent creates a composite current collector structure with a protective coating layer that serves dual functions: preventing corrosion and reducing interfacial resistance. The coating layer is designed to be electrically conductive, providing efficient electron transport pathways at the interface between the electrode layer and current collector, thereby improving electrochemical performance without significantly complicating the manufacturing process
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 modified current collector improves electrochemical performance by preventing substrate corrosion and reducing interfacial resistance, resulting in exceptional battery output.
Implementation Method 1
the binder material comprises a copolymer comprising a structural unit (a)... the binder material in the conductive layer of the modified current collector disclosed herein remains adhered to the substrate
Implementation Method 2
the conductive layer of the modified current collector can act as a physical barrier between the substrate and the alkaline electrode active material in the electrode layer. This prevents the corrosion of the substrate
Implementation Method 3
the conductive material in the conductive layer of the modified current collector reduces interfacial resistance between the electrode layer and the modified current collector itself, which improves the output performance of the electrode
Data Source
AI summary
Provided herein is a modified current collector for a secondary battery, comprising a substrate and a conductive layer applied on one side or both sides of the substrate, wherein the conductive layer comprises a conductive material and binder material, wherein the binder material comprises a copolymer. Also provided herein is an electrode for a secondary battery, comprising the modified current collector and an electrode layer, wherein the electrode layer is located on the surface of the conductive layer(s). Within an electrode comprising the modified current collector disclosed herein, the presence of the conductive layer inhibits corrosion of the substrate and reduces interfacial resistance between the electrode layer and the substrate. Consequently, batteries comprising such an electrode exhibit exceptional electrochemical performance.