Open AccessImproved Low Temperature Performance of Graphite/Li Cells Using Isoxazole as a Novel Cosolvent in Electrolytes
Author(s) -
Nuwanthi D. Rodrigo,
Sha Tan,
Zulipiya Shadike,
Enyuan Hu,
XiaoQing Yang,
Brett L. Lucht
Publication year - 2021
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac11a6
Subject(s) - electrolyte , ethylene carbonate , isoxazole , anode , solvent , interphase , graphite , chemistry , lithium (medication) , chemical engineering , dimethyl carbonate , inorganic chemistry , electrode , electrochemistry , materials science , organic chemistry , catalysis , medicine , biology , engineering , genetics , endocrinology
An investigation of novel electrolyte formulations to improve low temperature performance of Li/graphite half cells has been conducted. A novel electrolyte co-solvent, isoxazole (IZ), has been investigated in electrolyte systems composed of lithium difluoro(oxalato)borate (LiDFOB) in fluoroethylene carbonate (FEC) and LiDFOB in ethylene carbonate (EC). Cells containing 1 M LiDFOB FEC: IZ electrolyte have a significant improvement in capacity retention and reversible capacity at −10 °C. Ex-situ surface analysis of the cycled electrodes suggests that reduction of LiDFOB results in an oxalate rich solid electrolyte interphase (SEI). Addition of FEC, results in improved stability of the anode SEI preventing further decomposition of isoxazole solvent and improving cycling performance.