期刊
NANO ENERGY
卷 9, 期 -, 页码 196-203出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2014.07.020
关键词
Lithium-ion battery; Anode; SnLi4.4; Tin
类别
资金
- National Natural Science Foundation of China [21303161]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13037]
- Key Science and Technology Innovation Team of Zhejiang Province [2010R50013]
- China Postdoctoral Science Foundation [2012M521167]
- International Postdoctoral Exchange Program
Induction melting associated with simple ball-milling is utilized to synthesize a SnLi4.4@C core-shell hierarchical composite in which nanometer-sized SnLi4.4 particles are uniformly dispersed and encapsulated by carbon matrix. When evaluated as anode materials for lithium ion batteries, the composite exhibits a reversible capacity of 680 mA h g(-1) after 200 cycles at 200 mA g(-1). A capacity of 310 mA h g(-1) is obtained even at a high rate of 5000 mA g(-1). The superior electrochemical performance is ascribed to the fact that the prelithiated SnLi4.4 will not exert any expansion stress on the carbon matrix during the subsequent delithiation and lithiation processes, therefore guarantee the sustainable integrity of the composite in the prolonged cycling. The carbon matrix offers continuous transport paths for Li+ ions and electrons inside the composite. Meanwhile the carbon can sufficiently prevent the disintegration and aggregation of Sn nanoparticles upon prolonged cycling. The present study effectively circumvents the low initial Coulombic efficiency of the Sn-related nanocomposites and provides a protocol for pairing lithium-free cathodes to make the next-generation high energy lithium ion batteries. (C) 2014 Elsevier Ltd. All rights reserved.
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