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Citrate‐Assisted Growth of NiCo 2 O 4 Nanosheets on Reduced Graphene Oxide for Highly Reversible Lithium Storage
Author(s) -
Gao Guoxin,
Wu Hao Bin,
Lou Xiong Wen David
Publication year - 2014
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201400422
Subject(s) - materials science , graphene , oxide , anode , lithium (medication) , trisodium citrate , chemical engineering , nanocomposite , nanotechnology , nanostructure , electrode , metallurgy , medicine , chemistry , endocrinology , engineering
Hybrid nanostructures based on graphene and transition metal oxides hold great promise as high‐performance electrode materials for next‐generation lithium‐ion batteries. In this work, the rational design and fabrication of NiCo 2 O 4 nanosheets supported on reduced graphene oxide (denoted as rGO/NiCo 2 O 4 ) is presented as a novel anode material for highly efficient and reversible lithium storage. A solution method is applied to grow Ni‐Co precursor nanosheets on rGO, in which the addition of trisodium citrate is found crucial to guide the formation of uniform Ni‐Co precursor nanosheets. Subsequent thermal treatment results in formation of crystalline NiCo 2 O 4 nanosheets on rGO without damaging the morphology. The interconnected NiCo 2 O 4 nanosheets form hierarchically porous films on both sides of rGO. Such a hybrid nanostructure would effectively promote the charge transport and withstand volume variation upon prolonged charge/discharge cycling. As a result, the rGO/NiCo 2 O 4 nanocomposite demonstrates high reversible capacities of 954.3 and 656.5 mAh g –1 over 50 cycles at current densities of 200 and 500 mA g –1 respectively, and remarkable capacity retention at increased current densities.