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Graphite‐Nanoplate‐Coated Bi 2 S 3 Composite with High‐Volume Energy Density and Excellent Cycle Life for Room‐Temperature Sodium–Sulfide Batteries
Author(s) -
Li WeiJie,
Han Chao,
Chou ShuLei,
Wang JiaZhao,
Li Zhen,
Kang YongMook,
Liu HuaKun,
Dou ShiXue
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201503310
Subject(s) - composite number , graphite , materials science , volume (thermodynamics) , sulfide , energy density , composite material , chemical engineering , thermodynamics , engineering physics , metallurgy , engineering , physics
Graphite‐nanoplate‐coated Bi 2 S 3 composite (Bi 2 S 3 @C) has been prepared by a simple, scalable, and energy‐efficient precipitation method combined with ball milling. The Bi 2 S 3 @C composite was used as the cathode material for sodium–sulfide batteries. It delivered an initial capacity of 550 mAh g −1 and high stable specific energy in the range of 275–300 Wh kg −1 at 0.1 C, with an enhanced capacity retention of 69 % over 100 cycles. The unique structure demonstrates superior cycling stability, with a capacity drop of 0.3 % per cycle over 100 cycles, compared with that of bare Bi 2 S 3 . The sodium storage mechanism of Bi 2 S 3 was investigated based on ex situ X‐ray diffraction and scanning transmission electron microscopy.