Journal
NANO ENERGY
Volume 2, Issue 2, Pages 276-282Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2012.09.012
Keywords
Anodes; Cobalt carbonate; Energy storage; Graphene; Lithium ion batteries
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Funding
- 973 Program [2009CB220100]
- NSFC [21073096]
- Fundamental Research Funds for the Central Universities in China
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The composites of CoCO3 submicrocubes and graphene nanosheets (GNSs) were prepared through a solvothermal route and were tested as anode materials for lithium ion batteries. Profiting from the advantages of GNSs, CoCO3/GNS composites delivered high capacities of over 1000 mAh g(-1), much higher than theoretical values based on available lithium storage mechanisms. Instead, we propose an electrochemical catalytic conversion mechanism for lithium storage, in which not only cations (Co2+) but also anions (CO32-) are involved in the electron transfer. C4+ in CO32- is reduced to C-0 or other low-valence C under the electrochemical catalysis of newly-generated Co nanoparticles. This new mechanism may provide more clues for exploiting advanced materials for Li ion batteries and other energy storage devices. (C) 2012 Elsevier Ltd. All rights reserved.
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