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Poly(2‐ethyl‐2‐oxazoline) as a Gel Additive to Improve the Performance of Sulfur Cathodes in Lithium‐Sulfur Batteries
Author(s) -
Yang Qi,
Yu Yu,
Huang Wenlong,
Liu Yuansheng,
Liu Xu,
Liu Huitian,
Shan Zhongqiang
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202001594
Subject(s) - polysulfide , sulfur , dissolution , electrolyte , cathode , chemistry , lithium (medication) , chemical engineering , diffusion , inorganic chemistry , materials science , electrode , organic chemistry , medicine , physics , engineering , thermodynamics , endocrinology
Dissolution and free diffusion of polysulfides in ether‐based electrolyte during cycling causes fast capacity decay and low columbic efficiency in lithium‐sulfur batteries. In this work, poly(2‐ethyl‐2‐oxazoline) (PEtOx), as an additive of sulfur cathodes, can gelatinate the electrolyte in the presence of polysulfide species, which can anchor the uncontrollable diffusion of polysulfides during the discharge process. Additionally, pore structures can form in the sulfur cathode after the dissolution of PEtOx into the electrolyte. As a result, the sulfur converted from polysulfides during subsequent charging processes will deposit more uniformly in the porous cathode. This “dissolution‐redeposition” mechanism effectively reduces the loss of active materials, providing beneficial guidance for practical Li−S batteries.