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Electrochemical Characterization of Nanostructured LiMn 2 O 4 Composite in Lithium‐Ion Hybrid Supercapacitors
Author(s) -
Zheng Xiaowen,
Li Shuo,
Yang Yuan,
Chen Lina,
Si Pengchao
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.202001198
Subject(s) - supercapacitor , materials science , electrolyte , electrochemistry , lithium (medication) , composite number , spinel , chemical engineering , cathode , capacitance , graphene , aqueous solution , nanotechnology , composite material , electrode , chemistry , metallurgy , medicine , engineering , endocrinology
A nanostructured spinel LiMn 2 O 4 and graphene composite fabricated by using a simple one‐step method exhibits excellent electrochemical performance as the cathode for aqueous hybrid supercapacitors. The specific capacitance of commercial LiMn 2 O 4 is enhanced five‐fold with a scan rate that is also enhanced 20 times in 1 M Li 2 SO 4 aqueous electrolyte. In addition, the use of water‐in‐salt electrolyte (5 M LiTFSI) greatly improves the electrochemical performance of the hybrid devices, owing to the larger working window. A high energy density of 202 Wh kg −1 at power densities of 171 W kg −1 and 20 Wh kg −1 at 2571 W kg −1 were obtained in 5 M LiTFSI. This work provides two strategies to achieve high‐performance LiMn 2 O 4 ‐based cathodes and highly concentrated electrolyte for hybrid supercapacitors in actual applications.