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K‐Ion Storage Enhancement in Sb 2 O 3 /Reduced Graphene Oxide Using Ether‐Based Electrolyte
Author(s) -
Li Jinliang,
Zhuang Ning,
Xie Junpeng,
Li Xiaodan,
Zhuo Wenchen,
Wang Hao,
Na Jong Beom,
Li Xibo,
Yamauchi Yusuke,
Mai Wenjie
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201903455
Subject(s) - electrolyte , materials science , graphene , electrochemistry , anode , oxide , ether , chemical engineering , ion , battery (electricity) , inorganic chemistry , nanotechnology , electrode , organic chemistry , chemistry , metallurgy , thermodynamics , power (physics) , physics , engineering
In this work, an ether‐based electrolyte is adopted instead of conventional ester‐based electrolyte for an Sb 2 O 3 ‐based anode and its enhancement mechanism is unveiled for K‐ion storage. The anode is fabricated by anchoring Sb 2 O 3 onto reduced graphene oxide (Sb 2 O 3 ‐RGO) and it exhibits better electrochemical performance using an ether‐based electrolyte than that using a conventional ester‐based electrolyte. By optimizing the concentration of the electrolyte, the Sb 2 O 3 ‐RGO composite delivers a reversible specific capacity of 309 mAh g −1 after 100 cycles at 100 mA g −1 . A high specific capacity of 201 mAh g −1 still remains after 3300 cycles (111 days) at 500 mA g −1 with almost no decay, exhibiting a longer cycle life compared with other metallic oxides. In order to further reveal the intrinsic mechanism, the energy changes for K atom migrating from surface into the sublayer of Sb 2 O 3 are explored by density functional theory calculations. According to the result, the battery using the ether‐based electrolyte exhibits a lower energy change and migration barrier than those using other electrolytes for K‐ion, which is helpful to improve the K‐ion storage performance. It is believed that the work can provide deep understanding and new insight to enhance electrochemical performance using ether‐based electrolytes for KIBs.