Primer-Coated Cathode Current Collector for Magnesium Batteries
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Solution Overview
Problem
Conventional cathode current collectors in magnesium secondary batteries face issues with delamination of cathode active material at operating voltages due to low adhesive strength, leading to reduced battery performance and lifespan.
Innovation Solution
A cathode current collector is developed by coating a primer containing a conductive material and a polymer on a metallic base, such as stainless steel, to enhance adhesive strength and stability, thereby preventing delamination and maintaining electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stainless steel foil is used as a cathode current collector, then electrochemical stability is improved, but adhesive strength between the active material and the foil is reduced
Solution Approach 1:
The patent applies composite materials by coating a primer layer containing conductive material and polymer material on the stainless steel foil surface. This creates a composite structure where the stainless steel provides electrochemical stability while the primer coating enhances adhesive strength and surface activity, resolving the contradiction between electrochemical stability and adhesive strength.
Solution Approach 2:
The patent applies local quality by modifying only the surface of the stainless steel foil with a primer coating rather than changing the bulk material properties. The primer coating locally enhances adhesive strength and surface activity at the interface with the active material, while the underlying stainless steel maintains its electrochemical stability throughout the battery operation.
2Strength
If the cathode current collector is coated with a primer including conductive material and polymer material, then adhesive strength is improved, but device complexity is increased
Solution Approach 1:
The patent merges multiple functions into a single primer coating layer: it provides adhesive bonding, electrical conductivity, and surface activation in one integrated coating. This combines multiple potential separate layers into a single composite primer layer, reducing overall device complexity while maintaining all necessary functions.
Solution Approach 2:
The primer coating serves multiple functions simultaneously: it acts as an adhesive layer, a conductive layer, and a surface treatment layer. This multi-functionality eliminates the need for separate layers for each function, simplifying the overall device structure and reducing manufacturing complexity.
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 primer-coated current collector improves adhesive strength and internal resistance, resulting in increased battery lifespan and performance, with enhanced high-rate discharge characteristics and reduced capacity reduction over cycles.
Implementation Method 1
adhesive strength between the active material and the foil is reduced during rolling in processing of a battery
Implementation Method 2
a primer including a conductive material and a polymer material
Data Source
AI summary
Disclosed is a current collector prepared by coating a primer on a metallic base and a magnesium secondary battery including the same. The primer includes a conductive material and a polymer material and enhances adhesive strength between a cathode current collector and an active material, thereby maintaining stability in an operating voltage range of the battery without increasing internal resistance.