Fluorine Aluminum Oxide Layer for Electrochemical Self-Discharge
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Solution Overview
Problem
Conventional electrochemical devices with conductive polymer positive electrode materials suffer from insufficient suppression of self-discharge due to decomposition reactions at the positive current collector interface, leading to reduced capacitance and energy loss.
Innovation Solution
A positive electrode with an aluminum current collector coated by a fluorine-containing aluminum oxide layer, which enhances corrosion resistance and forms a stable passive film, preventing electrolyte decomposition and self-discharge, is used in conjunction with a porous positive electrode material layer and a carbon layer to manage anion movement and reduce direct contact between the current collector and the electrode material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional aluminum current collector is used in a positive electrode with conductive polymer, then the device achieves high output and fast charge-discharge performance, but self-discharge occurs due to decomposition reactions at the current collector interface
Solution Approach 1:
A fluorine-containing aluminum oxide layer is introduced as an intermediary between the aluminum current collector and the conductive polymer electrode material. This intermediate layer prevents direct contact and decomposition reactions while maintaining electrical conductivity, thereby suppressing self-discharge without sacrificing power output.
Solution Approach 2:
The current collector structure is transformed from pure aluminum to a composite system consisting of aluminum substrate with a fluorine-containing aluminum oxide coating layer. This composite structure combines the high conductivity of aluminum with the chemical stability and protective properties of the fluorinated oxide layer.
2Reliability
If the positive current collector surface is treated to prevent decomposition reactions, then self-discharge is suppressed, but reaction resistance increases and output performance deteriorates
Solution Approach 1:
The chemical composition and surface properties of the aluminum oxide layer are modified by incorporating fluorine elements, which changes the layer's properties to simultaneously achieve chemical stability (suppressing self-discharge) and electrical conductivity (maintaining power output).
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 fluorine-containing aluminum oxide layer effectively suppresses self-discharge, maintaining capacitance and energy storage efficiency by stabilizing the interface and reducing reaction with the electrolyte, while allowing for sufficient anion movement to support device operation.
Implementation Method 1
an aluminum oxide layer disposed on a surface of the positive current collector. The aluminum oxide layer contains fluorine
Implementation Method 2
enhances corrosion resistance and forms a stable passive film, preventing electrolyte decomposition
Implementation Method 3
the electrochemical device can be charged and discharged by adsorption (doping) and desorption (dedoping) of anions
Implementation Method 4
the electrochemical device can be charged and discharged by adsorption (doping) and desorption (dedoping) of anions
Implementation Method 5
allowing for sufficient anion movement to support device operation
Data Source
AI summary
An electrochemical device of the present invention includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. The positive electrode includes a positive current collector containing aluminum, a positive electrode material layer containing a conductive polymer, and an aluminum oxide layer disposed on a surface of the positive current collector. The aluminum oxide layer contains fluorine.