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Zwitterionic Electrolyte Additive for Lithium-Ion Batteries: Ammonium Alkyl Sulfonate
Ruize Sun1, Jingyu Yang1, Yongjin Fang1
1Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China.
A new zwitterionic additive, 3-(triethylammonium)-propane-1-sulfonate (TEAPS), enhances lithium-ion battery performance by forming a protective interface on both anode and cathode surfaces. This versatile additive improves cycling stability in propylene carbonate electrolytes.
Area of Science:
- Electrochemistry
- Materials Science
- Battery Technology
Background:
- Electrolyte additives are crucial for lithium-ion battery (LIB) performance.
- Current film-forming additives are limited to either the anode or cathode, increasing complexity and reducing efficiency.
Purpose of the Study:
- To design and synthesize a novel zwitterionic additive for LIBs.
- To investigate the additive's ability to form a stable interface on both anode and cathode.
- To evaluate the impact of the additive on battery cycling performance.
Main Methods:
- Synthesis of zwitterionic 3-(triethylammonium)-propane-1-sulfonate (TEAPS).
- Adsorption studies on graphite anode and LiCoO2 cathode surfaces in propylene carbonate (PC) electrolyte.
- Electrochemical cycling performance evaluation of LIBs with TEAPS additive.
Main Results:
- TEAPS adsorbs effectively on both graphite anode and LiCoO2 cathode.
- TEAPS facilitates the formation of a robust F/S/N-species interface.
- Significantly improved cycling performance of LIBs was observed.
Conclusions:
- The zwitterionic TEAPS additive demonstrates versatility by functioning on both electrodes.
- TEAPS promotes a stable and robust interfacial layer, enhancing battery cycling.
- TEAPS is a promising candidate for developing high-performance LIBs.
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