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High Chaos Induced Multiple-Anion-Rich Solvation Structure Enabling Ultrahigh Voltage and Wide Temperature Lithium-Metal Batteries by Fangyuan Cheng; Wen Zhang; Qing Li; Chun Fang; Jiantao Han; Yunhui Huang is a Engineering article available to read on EtoBox.

What is High Chaos Induced Multiple-Anion-Rich Solvation Structure Enabling Ultrahigh Voltage and Wide Temperature Lithium-Metal Batteries about?

The optimal electrolyte for ultrahigh energy density (>400 Wh/kg) lithium-metal batteries with a LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode is required to withstand high voltage (≥4.7 V) and be adaptable over a wide temperature range. However, the battery performance is degraded by aggressive electrode-electrolyte reactions at high temperature and high voltage, while excessive growth of lithium dendrites usually occurs due to poor kinetics at low temperature. Accordingly, the development of electrolytes has encountered challenges in that there is almost no electrolyte simultaneously meeting the above requirements. Herein, a high chaos electrolyte design strategy is proposed, which promotes the formation of weak solvation structures involving multiple anions. By tailoring a Li + -EMC-DMC-DFOB --PO 2 F 2 --PF 6 -multiple-anionrich solvation sheath, a robust inorganic-rich interphase is obtained for the electrode-electrolyte interphase (EEI), which is resistant to the intense interfacial reactions at high voltage (4.7 V) and high temperature (45 °C). In addition, the Li + solvation is weakened by the multiple-anion solvation structure, which is a benefit to Li + desolventization at low temper

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Author

Fangyuan Cheng; Wen Zhang; Qing Li; Chun Fang; Jiantao Han; Yunhui Huang

Publisher

American Chemical Society (ACS)

Published

2023

Language

EN

Field

Engineering (Physical Sciences)