期刊
ADVANCED ENERGY MATERIALS
卷 7, 期 21, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201700950
关键词
hierarchical structures; Li4Ti5O12; lithium ion batteries; ultrafast charge/discharge; ultrathin nanosheets
类别
资金
- National Basic Research Program of China [2013CB932601, 2014CB239303]
- National Natural Science Foundation of China [21133001]
Ultrathin Li4Ti5O12 nanosheet based hierarchical microspheres are synthesized through a three-step hydrothermal procedure. The average thickness of the Li4Ti5O12 sheets is only approximate to(6.6 +/- 0.25) nm and the specific surface area of the sample is 178 m(2) g(-1). When applied into lithium ion batteries as anode materials, the hierarchical Li4Ti5O12 microspheres exhibit high specific capacities at high rates (156 mA h g(-1) at 20 C, 150 mA h g(-1) at 50 C) and maintain a capacity of 126 mA h g(-1) after 3000 cycles at 20 C. The results clearly suggest that the utility of hierarchical structures based on ultrathin nanosheets can promote the lithium insertion/extraction reactions in Li4Ti5O12. The obtained hierarchical Li4Ti5O12 with ultrathin nanosheets and large specific surface area can be perfect anode materials for the lithium ion batteries applied in high power facilities, such as electric vehicles and hybrid electric vehicles.
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