Dry Battery Electrode Coating to Suppress Side Reactions
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Solution Overview
Problem
Existing rechargeable lithium batteries face issues with side reactions and irreversible capacity loss due to the use of binders with low lowest unoccupied molecular orbital (LUMO) levels, leading to degraded binding properties and reduced battery efficiency and lifespan.
Innovation Solution
Incorporating a catecholamine-based compound-containing layer on the surface of the active material and binder in a dry electrode film, which acts as a protective layer to suppress side reactions and mitigate irreversible capacity loss, using compounds like dopamine or polydopamine with a thickness of 0.1 to 20 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a binder with low LUMO level is used in the dry electrode film, then the binding properties are improved, but side reactions occur and irreversible capacity loss increases
Solution Approach 1:
The patent introduces a catecholamine-based compound layer as an intermediary substance between the binder and the electrolyte. This intermediate layer has high LUMO level characteristics that prevent direct contact between the low LUMO level binder and the electrolyte, thereby suppressing side reactions while maintaining the binding properties provided by the original binder.
Solution Approach 2:
The patent applies a thin film coating of catecholamine-based compounds (0.1 to 20 nm thickness) on the binder surface. This flexible thin film acts as a protective shell that maintains the structural integrity and binding function of the binder while providing a barrier against harmful electrochemical reactions with the electrolyte.
2Duration of action of stationary object
If a protective layer is added to suppress side reactions, then battery service life is improved, but device complexity increases
Solution Approach 1:
The patent modifies the surface properties of the binder by changing the chemical composition parameter - specifically by coating with catecholamine-based compounds that have high LUMO levels. This parameter change transforms the binder surface from being electrochemically active (prone to side reactions) to electrochemically stable, thereby extending battery service life without fundamentally changing the electrode structure.
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 catecholamine-based compound-containing layer enhances the initial efficiency and service life of the battery by reducing side reactions and maintaining binding properties, thereby improving the overall performance of the electrode.
Implementation Method 1
Incorporating a catecholamine-based compound-containing layer on the surface of the active material and binder in a dry electrode film
Implementation Method 2
the catecholamine-based compound-containing layer may be present on a surface of the active material and a surface of the first binder
Data Source
AI summary
The present disclosure provides an electrode for a rechargeable lithium battery and a rechargeable lithium battery including the electrode. The electrode includes an electrode active material layer, wherein the electrode active material layer is a dry electrode film including an active material having a catecholamine-based compound-containing layer and a first binder having a catecholamine-based compound-containing layer.