Open AccessNonflammable LiTFSI-Ethylene Carbonate/1,2-Dimethoxyethane Electrolyte for High-Safety Li-ion Batteries
Author(s) -
Huiying Liang,
Xiaoxi Zuo,
Lengdan Zhang,
Wenda Huang,
Qiuyu Chen,
Tianming Zhu,
Jiansheng Liu,
Junmin Nan
Publication year - 2020
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/ab8803
Subject(s) - electrolyte , dimethoxyethane , ethylene carbonate , dimethyl carbonate , chemistry , trimethyl phosphate , battery (electricity) , propylene carbonate , solvent , diethyl carbonate , thermal decomposition , chemical engineering , inorganic chemistry , electrode , organic chemistry , methanol , phosphate , engineering , power (physics) , physics , quantum mechanics
Developing a nonflammable electrolyte is an efficient strategy to eliminate fire hazards and improve battery safety. Electrolytes containing nonflammable phosphate solvents enhance battery safety to a certain extent, but their compatibility with electrodes remains an obstacle. Here, a nonflammable electrolyte based on carbonate solvent is designed to resolve this dilemma while guaranteeing battery performance. We demonstrate that a nonflammable electrolyte employing the popular film-forming solvent ethylene carbonate (EC) and 1,2-dimethoxyethane (DME) with 2.3 mol kg −1 lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) has excellent thermal stability owing to the unique solution molecule structure. What’s more, the nonflammable electrolyte possesses excellent compatibility with both LiNi 0.6 Co 0.2 Mn 0.2 O 2 and graphite electrode. The initial specific capacity and capacity retention rate of graphite/LiNi 0.6 Co 0.2 Mn 0.2 O 2 punch cells employing this electrolyte are 169.3 mAh g −1 and 98.7% (after 50 cycles), respectively, which are comparable to those of cells employing traditional carbonate electrolytes. Besides, short-circuit test of the pouch cell suggests that the release of gases accompanied by decomposition of electrolyte under abuse conditions is effectively suppressed. All of these results show a promising prospect of this nonflammable electrolyte for application in high-safety Li-ion batteries.