Journal
ELECTROCHIMICA ACTA
Volume 184, Issue -, Pages 308-315Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.09.098
Keywords
lithium-ion batteries; self-assembly; carbon nanosheet powders; spray drying; path-memory effect
Categories
Funding
- natural science foundation of China [21303062]
- science and technology projects of Guangdong Province [2013B090500025]
- science and technology projects of Guangzhou [2014J4100027, 2014Y2-00012]
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Based on the concepts of self-assembly and re-construction, flower-like porous carbon nanosheet powders (CNPs), which exhibit almost double theoretical capacity of prototype graphite powders, are prepared by spray drying a suspension of graphite oxide and cetyltrimethylammonium bromide (CTAB) and subsequent thermally-reducing treatment. The functional groups, edges, and defective sites of nanoscale graphite oxide intermediate and their interaction with CTAB additive are utilized to construct the CNP micro-/nanostructure with abundant wrinkles. This unique micro-/nanostructure not only facilitates coating CNPs on the anode substrate of lithium-ion batteries (LIBs) but also improves their electrochemical performances. Specifically, these CNPs display an initial specific capacity of approximately 807 mAh g(-1) and a stable capacity of approximately 650 mAh g(-1) after the 6th cycle at a charge-discharge current of 100 mA g(-1). And a capacity of approximately 600 mAh g(-1) is still kept after 100 cycles, showing the as-prepared CNPs have promising application in the LIBs. In addition, based on the insertion/extraction 'path-memory effect', a storage mechanism of lithium ions is proposed to explain the importance of wrinkles in the CNPs to the capacity and cycling stability. (C) 2015 Elsevier Ltd. All rights reserved.
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