Oligomer Cathode Coating for High-Temperature Lithium Battery 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 electrolytes, which limits their application in high-temperature environments.
Innovation Solution
An oligomer is synthesized through a reaction between epoxy acrylate resin and barbituric acid, forming a highly branched, thermally stable polymer that acts as a protective layer on the cathode material, preventing damage from high temperatures and enhancing the structural stability of lithium batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lithium transition metal oxide is used as cathode material in high temperature application, then high voltage and high energy density are achieved, but the cathode reacts with electrolytes and is damaged, leading to oxygen release and combustion reactions
Solution Approach 1:
The patent applies preliminary action by pre-coating the cathode material surface with an oligomer layer before battery operation. This oligomer layer is formed through a chemical reaction between epoxy acrylate resin and barbituric acid, creating a protective barrier that prevents the cathode from reacting with electrolytes at high temperatures, thus maintaining structural stability while preserving high voltage characteristics
Solution Approach 2:
The patent uses an oligomer as an intermediary substance between the cathode material and the electrolyte. This oligomer layer acts as a mediator that physically separates the cathode from direct contact with electrolytes, preventing harmful chemical reactions while allowing the battery to maintain its high voltage and energy density performance
2Power
If lithium transition metal oxide is used as cathode material, then high energy density is achieved, but oxygen is released to participate in combustion reaction, causing explosion and expansion
Solution Approach 1:
The patent applies preliminary action by pre-forming a protective oligomer coating on the cathode surface before any combustion reaction can occur. This pre-established barrier prevents oxygen release from the cathode material at high temperatures, eliminating the fuel for combustion reactions and preventing explosion and expansion while maintaining high energy density
Solution Approach 2:
The patent converts the potential harm of high-temperature oxygen release into a benefit by using the heat and chemical environment to drive the formation of a stable oligomer layer. This layer, formed through the reaction between epoxy acrylate and barbituric acid, actually prevents the harmful combustion reactions that would otherwise occur, thus converting the high-temperature condition from a danger into a mechanism for creating protection
3Power
If conventional cathode materials are used, then high voltage performance is achieved, but performance degradation occurs due to reaction with electrolytes at high temperature
Solution Approach 1:
The patent applies preliminary action by pre-coating the cathode with an oligomer layer that stabilizes the surface chemistry. This pre-protection allows the battery to maintain high voltage performance over extended cycling at high temperatures, preventing the performance degradation that would otherwise occur due to electrolyte-cathode reactions
Solution Approach 2:
The patent changes the surface chemical parameters of the cathode by introducing an oligomer coating with specific chemical properties (formed from epoxy acrylate and barbituric acid). This parameter change in surface chemistry maintains electrical performance while reducing chemical reactivity with electrolytes, thus extending battery cycle life without sacrificing high voltage characteristics
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 improves the thermal stability and safety of lithium batteries, maintaining excellent capacity and cycle life, even under high-temperature conditions, by forming a stable protection layer on the cathode material.
Implementation Method 1
The oligomer of the invention is obtained by a reaction of epoxy acrylate (EA) resin and barbituric acid (BTA)
Implementation Method 2
the oligomer...acts as a protective layer on the cathode material, preventing damage from high temperatures
Data Source
AI summary
An oligomer and a lithium battery are provided. The oligomer is obtained by a reaction of epoxy acrylate and barbituric acid. The lithium battery includes an anode, a cathode, a separator, an electrolyte solution and a packaging structure, wherein the cathode includes the oligomer.