Ketone-Based Polymer Electrolytes for High Voltage Lithium Ion Batteries
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Solution Overview
Problem
Existing electrolytes struggle to maintain stability and prevent capacity fade in lithium batteries using next-generation cathode materials that operate at high voltages, such as NCA and NCM, due to degradation issues like oxidation.
Innovation Solution
Development of a ketone-based polymer electrolyte with specific structural components and the option to include ceramic electrolyte particles, which can be crosslinked and combined with lithium salts, to enhance ionic transport and mechanical properties, suitable for use in both cathodes and separators within lithium battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional electrolytes are used in high voltage cathodes, then the battery can operate at high voltages, but the electrolyte degrades through oxidation leading to capacity fade
Solution Approach 1:
The patent modifies the chemical structure of polymer electrolytes by incorporating ketone groups at specific positions in the backbone, which changes the electrochemical stability parameters of the electrolyte to withstand high voltage oxidation conditions
Solution Approach 2:
The patent creates composite polymer electrolytes combining ketone-containing monomers with other functional monomers to achieve both high voltage stability and good ionic conductivity, resolving the contradiction between stability and performance
2Reliability
If polymer electrolytes are used to improve safety and stability, then electrochemical stability improves, but ionic transport properties may be limited compared to liquid electrolytes
Solution Approach 1:
The patent optimizes the molecular weight, composition ratios, and structural parameters of the ketone-containing polymer electrolyte to achieve a balance between stability and ionic conductivity, improving ionic transport while maintaining high voltage stability
Solution Approach 2:
The patent introduces specific functional groups and side chains at localized positions in the polymer structure to create regions with enhanced ionic conductivity without compromising the overall electrochemical stability of the electrolyte system
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 ketone-based polymer electrolytes demonstrate excellent lithium ion transport properties and electrochemical stability up to high voltages, reducing capacity fade and improving long-term stability in high-energy density lithium batteries.
Implementation Method 1
a solid polymer electrolyte in which the ketone-based polymer is immiscible
Implementation Method 2
The polymer may be crosslinked and may or may not be combined with an electrolyte salt to be used as a polymer electrolyte
Data Source
AI summary
New poly(ketone)-based polymers have been synthesized. When these polymers are combined with electrolyte salts, such polymer electrolytes have shown excellent electrochemical oxidation stability in lithium battery cells. Their stability along with their excellent ionic transport properties make them especially suitable as electrolytes in high energy density lithium battery cells.