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Diethyl (thiophen-2-ylmethyl) phosphonate: A Novel Multifunctional Electrolyte Additive for High Voltage Batteries

Abstract

Carbonate-based electrolytes used in Li-ion batteries encounter various challenges at extreme electrochemical environments, hence their application calls for the help of various additives, especially when used with high voltage cathode materials. These additives are designed to form protective interphases that prevent parasitic carbonate oxidation, while in certain cases they stabilize electrolytes from reduction at anode surfaces or even serve as flame-retardants that postpone the thermal runaway during overcharge. However, most of these additives are non-solvent to Li-salts, and their excessive use often casts negative effects. An ideal solution of minimizing the presence of these inert molecules is to identify an additive that structurally integrates these multiple functions into a single compound. In this work, we report a novel additive, diethyl (thiophen-2-ylmethyl) phosphonate (DTYP). Its 0.5% presence in a base electrolyte dramatically improves the capacity retention of a high voltage Li-ion cell using LiNi0.5Mn1.5O4 from 18% to 85% after 280 cycles at 1 C at 60 oC, raises the endothermic reaction onset temperature from 193 oC to 223 oC, and reduces the self-extinguishing time of the electrolyte from 88 s to 77 s. Thus, such a multifunctional additive presents a cost-efficient solution to the issues often faced in high voltage lithium-ion batteries.

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Publication details

The article was received on 05 Feb 2018, accepted on 09 May 2018 and first published on 11 May 2018


Article type: Paper
DOI: 10.1039/C8TA01236A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Diethyl (thiophen-2-ylmethyl) phosphonate: A Novel Multifunctional Electrolyte Additive for High Voltage Batteries

    Y. Zhu, X. Luo, H. Zhi, Y. Liao, L. Xing, M. Xu, X. Liu, K. Xu and W. Li, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01236A

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