Electrochemical Electrode Alkaline Resin Acid Neutralization
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Solution Overview
Problem
Electrochemical devices with etched aluminum foil current collectors face issues due to residual acid reacting with the binder in the active material layer, leading to deteriorated capacitor characteristics over time.
Innovation Solution
Incorporating alkalescent resin layers with a pH between 7.0 and 10 into the recessed parts of the etched metal foil current collector, which neutralizes the acid residues and prevents them from reaching the active material layers, thereby maintaining stable capacitor characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an etched aluminum foil is used as the current collector to increase surface area and improve capacitor characteristics, then the capacitor performance is improved, but residual acid from etching reacts with the binder in the active material layer over time, causing the active material layer to separate and capacitor characteristics to deteriorate
Solution Approach 1:
An alkalescent resin layer is introduced as an intermediary substance between the etched current collector and the active material layer. This resin layer neutralizes residual acid on the current collector surface, preventing it from reacting with the binder in the active material layer. The resin layer serves as a protective barrier that eliminates the harmful chemical interaction while maintaining the electrical and mechanical functionality of the electrode structure.
Solution Approach 2:
The alkalescent resin layer is applied to the etched current collector before the active material layer is formed. This preliminary action neutralizes the residual acid on the current collector surface in advance, preventing future degradation. By performing the neutralization step before active material deposition, the invention ensures that the binder will not be compromised by acid reactions during subsequent processing or device 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 alkalescent resin layers effectively neutralize acid residues, preventing alteration of the active material layers and ensuring stable capacitor performance for an extended period.
Implementation Method 1
the alkalescent resin layers formed inside the recessed parts of the current collector neutralize the residues of the acid used for etching the current collector
Data Source
AI summary
An electrochemical device electrode has a current collector, alkalescent resin layers, conductive layers, and active material layers. The current collector is an acid-etched metal foil whose surface has concavities. The alkalescent resin layers are formed and desiccated inside the concavities and exhibit weak alkalinity. The conductive layers are formed on the current collector and the alkalescent resin layers, contain conductive material, and are electrically connected to the current collector. The active material layers are formed on the conductive layers.