期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 22, 期 13, 页码 4422-+出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201504386
关键词
anodes; graphene; lithium-ion batteries; morphology control; nickel
资金
- NRF [NRF 2010-0029245]
- Global Frontier R&D Program of the Center for Multiscale Energy Systems - Ministry of Education, Science and Technology of Korea [NRF-2011-0031571]
- National Research Foundation of Korea [2010-0029245, 2011-0031571] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Nanostructured NiCo2O4 is directly grown on the surface of three-dimensional graphene-coated nickel foam (3D-GNF) by a facile electrodeposition technique and subsequent annealing. The resulting NiCo2O4 possesses a distinct flower or sheet morphology, tuned by potential or current variation electrodeposition, which are used as binder-free lithium-ion battery anodes for the first time. Both samples exhibit high lithium storage capacity, profiting from the unique binder-free electrode structures. The flower-type NiCo2O4 demonstrates high reversible discharge capacity (1459mAhg(-1) at 200mAg(-1)) and excellent cyclability with around 71% retention of the reversible capacity after 60 cycles, which are superior to the sheet-type NiCo2O4. Such superb performance can be attributed to high volume utilization efficiency with unique morphological character, a well-preserved connection between the active materials and the current collector, a short lithium-ion diffusion path, and fast electrolyte transfer in the binder-free NiCo2O4-coated 3D graphene structure. The simple preparation process and easily controllable morphology make the binder-free NiCo2O4/3D-GNF hybrid a potential material for commercial applications.
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