Solid-State Battery Catholyte Composition for Garnet Interface Stability
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Solution Overview
Problem
There is a need for new electrolytes and catholytes that are compatible with solid-state battery electrolyte separators in lithium-metal anode batteries, as existing liquid-based electrolytes are not suitable for solid-state rechargeable batteries with lithium-metal anodes.
Innovation Solution
A catholyte solution comprising a lithium salt and at least two aprotic C3-10 heterocyclic molecules, each independently containing a sulfur ring atom and optionally substituted with 1 to 6 substituents, is used in conjunction with a lithium-stuffed garnet solid-state electrolyte to enhance the performance of lithium-metal anode batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid-based electrolytes (carbonate-based) are used in batteries, then the batteries can achieve good ionic conductivity, but they are incompatible with solid-state electrolyte separators and lithium-metal anodes
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by using aprotic C3-10 heterocyclic molecules containing sulfur ring atoms instead of traditional carbonate-based solvents. This parameter change enables the electrolyte to be compatible with solid-state electrolyte separators while maintaining lithium-ion conductivity, resolving the contradiction between reliability and adaptability.
2Reliability
If conventional electrolytes are used with lithium-stuffed garnet solid-state electrolyte, then the battery can operate, but high voltage stability is poor and charge transfer at the interface is excessive
Solution Approach 1:
The catholyte solution acts as an intermediary layer between the lithium-stuffed garnet solid-state electrolyte and the cathode. The aprotic C3-10 heterocyclic molecules with sulfur ring atoms in the catholyte mediate the interface interactions, improving high voltage stability and reducing harmful charge transfer at the interface through chemical compatibility and interface engineering.
3Productivity
If existing electrolyte compositions are used, then the battery structure is simple, but fast charging capability and continuous discharge capacity are limited
Solution Approach 1:
The patent employs composite electrolyte composition combining a lithium salt with at least two different aprotic C3-10 heterocyclic molecules containing sulfur ring atoms. This composite approach enhances fast charging capability and continuous discharge capacity by leveraging the synergistic effects of different heterocyclic molecules while maintaining manageable system complexity.
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 proposed catholyte solution improves high voltage stability, reduces charge transfer at the lithium-stuffed garnet interface, enables fast charging, and enhances the continuous discharge capacity and calendar life of lithium-metal anode batteries.
Implementation Method 1
The solid-state electrolyte separator must be a solid, also stable in contact with lithium metal, and able to conduct Li+ ions but not electrons at appreciable rates
Implementation Method 2
a catholyte solution comprising a lithium salt and at least two aprotic C3-10 heterocyclic molecules
Data Source
AI summary
Provided herein are compositions which are useful as electrolytes and/or catholytes in an electrochemical cell that includes a solid-state separator and a lithium-metal anode.