Oligomer-Polymer Cathode Coating for Thermal Stability
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Solution Overview
Problem
Commercialized secondary lithium batteries with lithium transition metal oxide cathodes suffer from structural instability and potential combustion at high temperatures, leading to performance degradation and safety issues.
Innovation Solution
An oligomer-polymer is developed through the polymerization of a compound with an ethylenically unsaturated group and a nucleophile compound, forming a hyperbranched structure that acts as a protective layer on the cathode material, enhancing thermal stability and preventing damage in high-temperature environments.
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 high voltage and high energy density are achieved, but structural stability deteriorates at high temperatures leading to combustion and performance degradation
Solution Approach 1:
The patent uses a composite material consisting of lithium transition metal oxide cathode material combined with an oligomer-polymer coating layer. This composite structure allows the battery to maintain high energy density from the lithium transition metal oxide while the oligomer-polymer layer provides thermal stability and prevents combustion at high temperatures, thus resolving the contradiction between energy density and structural stability.
2Power
If lithium transition metal oxide cathode is used, then high voltage is achieved, but safety deteriorates due to combustion reactions at high temperatures
Solution Approach 1:
The oligomer-polymer coating acts as an intermediary layer between the lithium transition metal oxide cathode and the external environment. This intermediate layer prevents direct contact and reaction between the cathode material and oxygen or other reactive substances, thereby eliminating the combustion risk while preserving the high voltage characteristics of the lithium transition metal oxide.
3Productivity
If high temperature operation is performed, then battery performance is maintained, but cathode structural stability deteriorates causing oxygen release and combustion
Solution Approach 1:
The oligomer-polymer coating is applied in advance to the lithium transition metal oxide cathode material before battery operation. This preliminary protective action creates a stable surface layer that prevents oxygen release during high-temperature operation, allowing the battery to maintain its performance without generating harmful oxygen that could lead to combustion.
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 maintains good capacitance, battery efficiency, and extends the charge and discharge cycle life of lithium batteries even at high temperatures, while ensuring safety by forming a stable complex with metal oxides and providing a protective layer.
Implementation Method 1
The oligomer-polymer of the invention is obtained by the polymerization reaction of a compound containing an ethylenically unsaturated group and a nucleophile compound
Implementation Method 2
the oligomer-polymer of the invention maintains good capacitance, battery efficiency, and extends the charge and discharge cycle life of lithium batteries even at high temperatures, while ensuring safety by forming a stable complex with metal oxides
Data Source
AI summary
An oligomer-polymer is provided. The oligomer-polymer is obtained by the polymerization reaction of a compound containing an ethylenically unsaturated group and a nucleophile compound, wherein the nucleophile compound includes the compound shown in formula 1:A lithium battery including an anode, a cathode, an isolation film, an electrolyte solution, and a package structure is also provided, wherein the cathode includes the oligomer-polymer.