Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 56, Pages 14056-14063Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201703164
Keywords
amorphous structure; anode materials; carbon nanotubes; cobalt sulfide; molybdenum sulfide
Categories
Funding
- Natural Science Foundation of China [21301086]
- Natural Science Foundation of Shandong Province [ZR2013BQ008]
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Cobalt sulfide and molybdenum sulfide, with high theoretical capacities, have been considered as one of most promising anode materials for lithium-ion batteries (LIBs). However, the poor cyclability and low rate performances originating from the large volume expansion and poor electrical conductivity extremely inhibit their practical application. Here, the electrochemical performances are effectively improved by growing amorphous cobalt sulfide and molybdenum sulfide onto amorphous carbon-coated multiwalled carbon nanotubes (CNTs@C@CoS2 and CNTs@C@MoS2). The CNTs@C@CoS2 presents a high reversible specific capacity of 1252 mAhg(-1) at 0.2 Ag-1, excellent rate performance of 672 mAhg(-1) (5 Ag-1), and enhanced cycle life of 598 mAhg(-1) after 500 cycles at 2 Ag-1. For CNTs@C@MoS2, it exhibits a specific capacity of 1395 mAhg(-1), superior rate performance of 727 mAhg(-1) at 5 Ag-1, and long cycle stability (796 mAhg(-1) after 500 cycles at 2 Ag-1). The enhanced electrochemical properties of the electrodes are probably ascribed to their amorphous nature, the combination of CNTs@C that adhered and hindered the agglomeration of CoS2 and MoS2 as well as the enhanced electronic conductivity.
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