Oligomer-Polymer Cathode Coating for Lithium Battery Thermal Stability
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Solution Overview
Problem
Commercialized secondary lithium batteries face issues with cathode material stability at high temperatures, leading to performance degradation and potential explosions due to reaction with electrolyte solutions, which affects their safety and efficiency.
Innovation Solution
An oligomer-polymer is developed through the polymerization of a polymerizable compound with ethylenically unsaturated and active hydrogen groups, forming a protective layer on the cathode material to enhance thermal stability and prevent damage from high temperatures, using a Michael addition reaction and suitable reaction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium transition metal oxide is used as the cathode material, then the battery can achieve high energy density and voltage, but the cathode readily reacts with the electrolyte solution at high temperatures causing structural damage and safety issues
Solution Approach 1:
An oligomer-polymer coating layer is applied to the cathode material surface as an intermediary protective barrier. This coating prevents direct contact between the cathode and electrolyte solution while allowing lithium ion transport, thereby maintaining cathode structural stability at high temperatures without compromising energy density
Solution Approach 2:
The cathode is designed as a composite structure combining lithium transition metal oxide core with an oligomer-polymer shell. The composite material integrates the high energy density properties of the metal oxide with the thermal stability and protective properties of the polymer coating
2Temperature
If the cathode material is exposed to high temperatures, then the battery can operate in high-temperature environments, but the cathode reacts with the electrolyte solution causing oxygen release and combustion reactions
Solution Approach 1:
The oligomer-polymer coating serves as a thermal barrier and chemical protective intermediary between the cathode and electrolyte. It allows the battery to operate at elevated temperatures while preventing the harmful combustion reactions by blocking direct interaction between reactive components
Solution Approach 2:
The coating transforms the high-temperature operating condition, which would normally cause harmful reactions, into a beneficial scenario where the thermal stability of the oligomer-polymer material protects the cathode and enables safe high-temperature operation
3Device complexity
If conventional cathode materials are used without modification, then the battery design remains simple, but the battery experiences performance degradation and swelling due to cathode damage
Solution Approach 1:
The oligomer-polymer coating is applied in advance to the cathode material before battery assembly and operation. This preliminary protective action prevents cathode damage from occurring in the first place, eliminating performance degradation and swelling issues without requiring complex battery design modifications
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 oligomer-polymer improves the lithium battery's capacity, efficiency, and cycle life, maintaining safety and performance even at high temperatures without modifying existing battery designs or materials.
Implementation Method 1
The oligomer-polymer is obtained by a Michael addition reaction of the polymerizable compound
Implementation Method 2
the cathode material continuously maintains its structural stability with high performance in high temperature applications
Data Source
AI summary
An oligomer-polymer and a lithium battery are provided. The oligomer-polymer is obtained by a polymerization of a polymerizable compound having at least one ethylenically unsaturated group and at least one active hydrogen group in the same molecule. The lithium battery includes an anode, a cathode, a separator, an electrolyte solution and a package structure, wherein the cathode includes the oligomer-polymer.