Journal
CARBON
Volume 141, Issue -, Pages 258-265Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2018.09.060
Keywords
Lithium-sulfur battery; Graphene; Zinc oxide; Core-shell structure
Funding
- National Natural Science Foundation of China [51772335]
- Guangdong Natural Science Foundation [2016A030313346, 2014A030306022]
- Guangdong Youth Top-notch Talent Support Program [2015TQ01C201]
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Employ of hollow nanostructure carbon materials as a host framework for sulfur cathode is a promising strategy to cope with the notorious posers in lithium-sulfur (Li-S) battery. However, the dissolution and diffusion of intermediate polysulfides in electrolytes still result in rapid capacity loss and poor rate performances, due to the weak interaction between polarized lithium polysulfides and non-polarized carbon host. To address this challenge, a bipolar material, zinc oxide embedded tetrapod-shaped carbon shell (TCS/ZnO) is designed for polysulfides immobilization in Li-S battery. The TCS/ZnO composites are synthesized through a CVD process using tetrapod shaped ZnO nanowhiskers as template, following by a partially hydrogen etching treatment. Attributed to the strong chemisorption of ZnO to polysulfides, high initial specific capacity of 1284 mAh g(sulfur)(-l), stable Coulombic efficiency of similar to 99.5% and excellent cycling stability (815 mAh g(sulfur)(-l) after 100 cycles at 0.2 C) are exhibited for S-TCS/ZnO cathode with optimized ratio of ZnO. (C) 2018 Elsevier Ltd. All rights reserved.
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