Polymer-Coated Electrode Material for Lithium-Ion Battery Cycle Stability
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Solution Overview
Problem
Current battery electrode materials, such as graphite, undergo severe volume changes during lithium insertion and extraction, leading to mechanical instability, particle pulverization, and rapid capacity fading, necessitating the development of materials resistant to volume change and particle pulverization while minimizing surface side reactions.
Innovation Solution
A method involving the formation of a self-assembled monolayer on a substrate followed by deposition of a polymer coating, using specific bonding agents and polymer monomers, to create a layered material that enhances structural stability and reduces surface reactions, thereby improving cycle stability and mechanical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrode materials undergo lithium insertion and extraction, then energy storage capacity is improved, but volume changes cause mechanical instability and particle pulverization
Solution Approach 1:
The patent applies a polymer coating layer that forms a flexible protective shell around the electrode material particles. This shell accommodates volume changes during lithium insertion and extraction while maintaining structural integrity, preventing particle pulverization and mechanical instability.
Solution Approach 2:
The patent creates a composite structure consisting of the electrode material core and polymer coating shell. This composite design combines the high capacity of the electrode material with the mechanical stability and flexibility of the polymer coating, resolving the contradiction between capacity and stability.
2Quantity of substance
If electrode materials undergo severe volume changes, then lithium storage capacity is improved, but particle pulverization and capacity fading occur
Solution Approach 1:
The polymer coating is applied beforehand to cushion and accommodate the volume changes that will occur during lithium insertion and extraction cycles. This pre-protection prevents mechanical failure and capacity fading during cycling, maintaining reliability while preserving storage capacity.
Solution Approach 2:
The flexible polymer coating shell allows for reversible expansion and contraction during cycling, accommodating volume changes without causing particle pulverization. This maintains both lithium storage capacity and cycle stability over multiple charging and discharging cycles.
3Stability of the object's composition
If bonding agents with specific functional groups are used, then self-assembled monolayer formation is improved, but coating adhesion and mechanical stability are enhanced
Solution Approach 1:
The bonding agent acts as an intermediary layer between the electrode material substrate and the polymer coating. It forms a self-assembled monolayer with specific functional groups that provide both ordered structure formation and strong chemical bonding interfaces, simultaneously achieving monolayer stability and coating adhesion.
Solution Approach 2:
The patent utilizes specific functional groups (epoxy, ureido, amino, or isocyano) in the bonding agent that can form strong chemical bonds with both the substrate and polymer coating. This chemical parameter change enables dual functionality of structured monolayer formation and strong interfacial adhesion.
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 approach results in an electrode material that maintains mechanical integrity and suppresses side reactions, achieving stable cycle performance and high Coulombic efficiency over multiple charging and discharging cycles, with enhanced uniformity and reduced thickness change.
Implementation Method 1
heating a substrate with a bonding agent to form a self-assembled monolayer-containing material
Implementation Method 2
depositing a polymer coating onto the self-assembled monolayer-containing material under an elevated temperature to form a layered material
Implementation Method 3
inducing reactive groups on the surface of the substrate by an oxidation treatment for facilitating the binding between the bonding agent and the substrate
Data Source
AI summary
A method of preparing an electrode material includes heating a substrate with a bonding agent to form a self-assembled monolayer-containing material; and depositing a polymer coating onto the self-assembled monolayer-containing material under an elevated temperature to form a layered material. An electrode material and an electrode incorporating the electrode material is also provided.