Positive Electrode Current Collector Design for Battery Corrosion Control
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Solution Overview
Problem
Existing batteries face challenges in enhancing safety performance without compromising electrochemical performance, particularly due to corrosion effects on the positive electrode current collector.
Innovation Solution
A battery design that includes a positive electrode plate with a conductive layer and an organic support layer, where the thickness of the conductive layer and the concentrations of specific anions in the electrolytic solution are optimized to meet the relationship 0.2×(C2/C1)≤H1≤(C2/C1)+3, thereby reducing corrosion effects and improving safety and electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of the conductive layer is reduced to enhance safety, then corrosion resistance improves, but the electrochemical performance deteriorates
Solution Approach 1:
The patent introduces the organic support layer as an intermediary between the conductive layer and the electrolytic solution. This intermediary layer protects the conductive layer from direct contact with the electrolyte, reducing corrosion effects while maintaining the electrical conductivity needed for electrochemical performance.
Solution Approach 2:
The patent changes the physical and chemical parameters of the system by optimizing the thickness of the conductive layer and the concentrations of anions in the electrolytic solution according to the formula 0.2×(C2/C1)≤H1≤(C2/C1)+3. This parameter optimization reduces corrosion resistance improvement while minimizing the negative impact on electrochemical performance.
2Reliability
If the concentrations of anions in the electrolytic solution are adjusted to reduce corrosion, then safety performance improves, but the ionic conductivity may deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the concentrations of anions (C1 and C2) in the electrolytic solution within specific ranges that satisfy the formula 0.2×(C2/C1)≤H1≤(C2/C1)+3. This optimization reduces corrosion and improves safety performance while maintaining acceptable ionic conductivity for battery operation.
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 optimized battery design achieves improved safety performance and extended service life while maintaining good electrochemical performance, as demonstrated by reduced corrosion and enhanced cycling performance.
Implementation Method 1
the electrolytic solution comprises a solvent and a solute being an ionic salt formed from a cation and an anion
Implementation Method 2
the electrolytic solution comprises a solvent and a solute being an ionic salt
Implementation Method 3
the effect of corrosion of the conductive layer on the safety performance and the electrochemical performance of the battery can be reduced
Data Source
AI summary
Provided a battery, a method for preparation thereof and an electrical device containing the same, wherein the battery includes a positive electrode plate and an electrolytic solution, the positive electrode plate including a positive electrode current collector and the positive electrode current collector including a conductive layer, and the electrolytic solution includes a first anion and a second anion, the first anion includes an anion selected from hexafluorophosphate anions, the second anion includes one ore more selected from anions shown in Formula 1 and an anion shown in Formula 2. The present application can improve the safety performance of the battery while enabling the battery to have good electrochemical performance.