Cross-linked Glyceryl Ether Epoxy Resin Electrolyte for High Voltage Stability
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Solution Overview
Problem
Conventional glyceryl ether epoxy resin electrolytes with ether oxygen groups have low oxidation potential, leading to decomposition when used with high-voltage cathode materials, limiting the improvement of battery output voltage and energy density in flexible lithium-ion batteries.
Innovation Solution
A cross-linked polyethylene glycol-based glyceryl ether epoxy resin (c-PEGR) is developed through a ring-opening reaction of glyceryl ether polymer and polyamine compound, restricting the movement of hydroxyl groups and enhancing oxidation stability, with an oxidation potential reaching 4.36V, and is used in a lithium ion battery electrolyte with excellent compatibility with Li metal anodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional glyceryl ether epoxy resin electrolyte is used, then flexibility and processability are improved, but oxidation potential is low causing decomposition at high voltage
Solution Approach 1:
The patent uses polyethylene glycol (PEG) as a gel former combined with glyceryl ether epoxy resin to create a composite gel electrolyte. The PEG component forms a three-dimensional network structure that enhances the oxidation stability of the electrolyte, allowing it to withstand high voltage cathode materials while maintaining the flexibility and processability inherent to glyceryl ether epoxy resin electrolytes
2Reliability
If copolymerization organic-inorganic compounding is used to improve oxidation stability, then device complexity increases but inherent low oxidation stability is not substantially resolved
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating PEG with specific molecular weights (2000-10000) into the glyceryl ether epoxy resin system. This parameter change creates a gel electrolyte with enhanced oxidation stability that can be prepared through a relatively simple process of mixing and curing, avoiding the complex copolymerization and organic-inorganic compounding procedures
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 c-PEGR electrolyte demonstrates improved oxidation stability, maintaining a stable voltage platform and cycle performance, preventing Li dendrite growth and electrolyte consumption, and achieving high capacity retention and coulombic efficiency even at high voltages.
Implementation Method 1
ability to adequate contact with electrodes and conduct lithium ions
Implementation Method 2
A cross-linked polyethylene glycol-based glyceryl ether epoxy resin (c-PEGR) is developed through a ring-opening reaction of glyceryl ether polymer and polyamine compound
Data Source
AI summary
A lithium ion battery electrolyte comprising a glyceryl ether epoxy resin gel is provided. The glyceryl ether epoxy resin gel comprises a glyceryl ether epoxy resin and an electrolyte. The glyceryl ether epoxy resin is a cross-linked polymer obtained by a ring-opening reaction of a glyceryl ether polymer and a polyamine compound. The glyceryl ether polymer is a glycidyl ether polymer comprising at least two epoxy groups, and the polyamine compound comprises at least two amine groups. The cross-linked polymer comprises a main chain and a plurality of hydroxyl groups, and the plurality of hydroxyl groups are located on the main chain. The electrolyte comprises a lithium salt and a non-aqueous solvent. The lithium salt and the glyceryl ether epoxy resin are dispersed in the non-aqueous solvent. A method of making the lithium ion battery electrolyte is also provided.