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Hierarchical High‐Porosity Graphene Oxide‐Porous Carbon/Sulfur Composite with Sodium Chloride as Temporary Space Holders for High‐Performance Lithium‐Sulfur Batteries
Author(s) -
Chen Xingbu,
Wang Yang,
Wang Yichen,
Huang Jingyun,
Ye Zhizhen
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900418
Subject(s) - sulfur , graphene , porosity , materials science , oxide , composite number , carbon fibers , chemical engineering , cathode , lithium–sulfur battery , battery (electricity) , lithium (medication) , chloride , inorganic chemistry , composite material , electrochemistry , nanotechnology , chemistry , electrode , metallurgy , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
The ultrahigh theoretical specific capacity and energy density of lithium‐sulfur batteries have attracted extensive research, but the main issues including the insulating nature of sulfur, large volumetric expansion during discharging, and shuttle effect of polysulfides still need to be solved. Herein, a hierarchical high‐porosity graphene oxide‐porous carbon/sulfur (GO‐PC/S) composite cathode is designed and fabricated. In this work, sodium chloride was used as temporary space holders to create a hierarchical porous structure for accelerating the transmission of Li + , accommodating the volumetric expansion, and enlarging the specific surface area (342.623 m 2 g −1 ) up to eight times. Owing to the abundant oxygen‐containing functional groups of GO, sulfur and polysulfides can be effectively immobilized and the conductivity is enhanced by porous carbon. The Li−S battery exhibits outstanding kinetic performance and rate capability (618.3 mAh g −1 at 2 C) as well as excellent cycling performance over 300 cycles.