期刊
ELECTROCHIMICA ACTA
卷 194, 期 -, 页码 17-25出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.02.085
关键词
ultrathin nanoplates; graphene; layered double hydroxides; lithium-ion battery
资金
- Fundamental Research Funds for the Central Universities
- National Natural Science Foundation of China [21273022, 51272030, 21573023]
As anode materials for lithium-ion batteries, bicomponent metal oxide composites show high reversible capacities; but the morphology and particle size of the composites are hardly controllable, which may reduce their electrochemical properties. In this work, ultrathin NiO/NiFe2O4 nanoplates with a diameter of 5 similar to 7 nm and a thickness of similar to 2 nm are controllably fabricated on the graphene derived from NiFe layered double hydroxides (NiFe-LDHs), and exhibit superior electrochemical performance compared to pure NiO/NiFe2O4 aggregates without graphene. The nanosized NiO and NiFe2O4 plates are separated from each other and the graphene substrate can prevent the aggregation of NiO/NiFe2O4 as well as enhance the electronic conductivity of the composite, which is beneficial to improving the electrochemical performance. Moreover, the effects of the content and the particle size/component of NiO/NiFe2O4 on the electrochemical performances are also studied in order to achieve optimal performance. Ultrathin NiO/NiFe2O4 nanoplates are further encapsulated by graphene nanosheets and show slightly decreased performance compared to those supported by graphene nanosheets. The different electrochemical behaviors of graphene-containing composites may be attributed to the different interactions between graphene nanosheets and NiO/NiFe2O4 nanoplates. (C) 2016 Elsevier Ltd. All rights reserved.
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