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In Situ Electrochemically Derived Amorphous‐Li 2 S for High Performance Li 2 S/Graphite Full Cell
Author(s) -
Ye Fangmin,
Liu Meinan,
Yan Xue,
Li Jia,
Pan Zhenghui,
Li Hongfei,
Zhang Yuegang
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201703871
Subject(s) - materials science , graphite , electrochemistry , cathode , lithium (medication) , amorphous solid , chemical engineering , electrode , amorphous carbon , carbon fibers , nanotechnology , chemistry , composite material , organic chemistry , composite number , medicine , engineering , endocrinology
High‐capacity Li 2 S cathode (1166 mAh g −1 ) is regarded as a promising candidate for the next‐generation lithium ion batteries. However, its high potential barrier upon the initial activation process leads to a low utilization of Li 2 S. In this work, a Li 2 S/graphite full cell with the zero activation potential barrier is achieved through an in situ electrochemical conversion of Li 2 S 8 catholyte into the amorphous Li 2 S. Theoretical calculations indicate that the zero activation potential for amorphous Li 2 S can be ascribed to its lower Li extraction energy than that of the crystalline Li 2 S. The constructed Li 2 S/graphite full cell delivers a high discharge capacity of 1006 mAh g −1 , indicating a high utilization of the amorphous Li 2 S as a cathode. Moreover, a long cycle life with 500 cycles for this Li 2 S/graphite full cell is realized. This in situ electrochemical conversion strategy designed here is inspired for developing high energy Li 2 S‐based full cells in future.