Document Detail

Sulphur-TiO(2) yolk-shell nanoarchitecture with internal void space for long-cycle lithium-sulphur batteries.
MedLine Citation:
PMID:  23299881     Owner:  NLM     Status:  In-Data-Review    
Sulphur is an attractive cathode material with a high specific capacity of 1,673 mAh g(-1), but its rapid capacity decay owing to polysulphide dissolution presents a significant technical challenge. Despite much efforts in encapsulating sulphur particles with conducting materials to limit polysulphide dissolution, relatively little emphasis has been placed on dealing with the volumetric expansion of sulphur during lithiation, which will lead to cracking and fracture of the protective shell. Here, we demonstrate the design of a sulphur-TiO(2) yolk-shell nanoarchitecture with internal void space to accommodate the volume expansion of sulphur, resulting in an intact TiO(2) shell to minimize polysulphide dissolution. An initial specific capacity of 1,030 mAh g(-1) at 0.5 C and Coulombic efficiency of 98.4% over 1,000 cycles are achieved. Most importantly, the capacity decay after 1,000 cycles is as small as 0.033% per cycle, which represents the best performance for long-cycle lithium-sulphur batteries so far.
Zhi Wei Seh; Weiyang Li; Judy J Cha; Guangyuan Zheng; Yuan Yang; Matthew T McDowell; Po-Chun Hsu; Yi Cui
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature communications     Volume:  4     ISSN:  2041-1723     ISO Abbreviation:  Nat Commun     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-09     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101528555     Medline TA:  Nat Commun     Country:  England    
Other Details:
Languages:  eng     Pagination:  1331     Citation Subset:  IM    
1] Department of Material Science and Engineering, Stanford University, Stanford, California 94305, USA [2].
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