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Biodegradable Bacterial Cellulose-Supported Quasi-Solid Electrolyte for Lithium Batteries
journal contribution
posted on 2020-03-12, 17:48 authored by Mingxia Yan, Wenjie Qu, Qingdong Su, Shi Chen, Yi Xing, Yongxin Huang, Nan Chen, Yuejiao Li, Li Li, Feng Wu, Renjie ChenThe stringent safety
and sustainability requirements for electrolytes used in lithium batteries
have led to significant research efforts into alternative materials.
Here, a quasi-solid electrolyte based on biodegradable bacterial cellulose
(BC) was successfully synthesized via a simple ball milling method.
The BC provides plenty of sites for the attachment of ionic liquid
electrolytes (ILEs) as well as ion transport channels. Moreover, the
O–H groups contained in the BC molecular chains interact with
anions in ILEs to form hydrogen bonds, which promotes the dissociation
of the lithium salts. The prepared electrolytes (BC-ILEs) have good
thermal stability with a decomposition temperature exceeding 300 °C
and high ionic conductivities. The Li/BC-ILE/LiFePO4 battery
exhibits remarkable electrochemical performance. More importantly,
the results of the Fehling test verify that the electrolyte can be
degraded by cellulase. The quasi-solid electrolyte broadens the range
of electrolytes for lithium batteries and provides new avenues to
explore safe and eco-friendly materials.