Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 2, Pages 1348-1356Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01914
Keywords
lithium-sulfur batteries; shuttle effect; Co3O4; acidified carbon nanotubes; bird nest; polysulfide intermediates; catalytic
Funding
- National Natural Science Foundation of China [51202117]
- Natural Science Foundation of Beijing [2162037, L182062]
- Beijing Nova program [Z171100001117077]
- Fundamental Research Funds for the Central Universities [2014QJ02]
- Key Laboratory of Advanced Materials of Ministry of Education [2018AML03]
- Yue Qi Young Scholar Project of China University of Mining & Technology (Beijing) [2017QN17]
- University of Alaska Fairbanks
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Lithium-sulfur battery with a much higher specific capacity and energy density than the commercial Li-ion battery is the most promising energy storage system. However, the shuttle effect of the dissolved sulfide polyanions and the insulating sulfur materials during charge/discharge of Li-S batteries reduce the coulombic efficiency and the cycle life of the batteries. Herein, we prepared novel Co3O4/acidified multiwall carbon nanotube (ACNT) hosting materials with a stable bird-nest structure, which integrates metal oxide with a conductive framework effectively. The double barrier of the bird-nest hosting materials suppress the shuttle effect and the carbon nanotubes provide a high electronic conductivity in the sulfur cathode. The composite Co3O4/S/ACNT cathode exhibited an initial discharge capacity of 1285 mAh g(-1) at 0.1 C and 693.7 mAh g(-1) was retained after 550 cycles at 0.5 C. The cross-linked bird-nest structure not only encapsulates polysulfide effectively, but also promotes the transformation and utilization of polysulfides thanks to the catalytic properties of Co3O4.
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