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Uniform core-shell Cu6Sn5@C nanospheres with controllable synthesis and excellent lithium storage performances
Su, LW (Su, Liwei); Fu, JH (Fu, Jianghao); Zhang, PJ (Zhang, Pinjie); Wang, LB (Wang, Lianbang); Wang, YH (Wang, Yuanhao); Ren, MM (Ren, Manman)
2017
发表期刊RSC ADVANCES
卷号7期号:45页码:28399-28406
摘要

Metallic tin (Sn) is one of the most promising alternatives to graphite anodes for lithium ion batteries due to its higher theoretical capacity, higher packing density and safer thermodynamic potential, while the huge volume transformation during repeated cycling leads to rapid pulverization and consequently poor capacity retention. This work provides an easy-to-control method to prepare uniform core-shell Cu6Sn5@C nanospheres in which Cu@Sn cores (40-50 nm in diameter) are well encapsulated by PANI-derived carbon layers with a thickness of similar to 5 nm. The obtained Cu6Sn5@C exhibits an excellent cycling ability and good rate capabilities. Both the reversible capacity (518 mA h g(-1)) after 100 cycles and the initial coulombic efficiency (89.2%) are the highest values in Cu6Sn5-based materials. The impressive cycling performance is believed to result from the carbon coating that not only prevents particle agglomeration during the synthesis but also accommodates the vast structural transformation of the Cu6Sn5 nanocores during the electrochemical (de)lithiation process, so ensuring good ionic and electronic transport to the core. The effect of synthesis conditions on the composition are also investigated systematically.

DOI10.1039/c7ra02214j
收录类别SCI
WOS记录号WOS:000402999300053
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.xjipc.cas.cn/handle/365002/5096
专题材料物理与化学研究室
作者单位1.Zhejiang Univ Technol, Coll Chem Engn, State Key Lab Breeding Base Green Chem Synth Tech, Hangzhou 310014, Zhejiang, Peoples R China
2.Juhua Grp Technol Ctr, Quzhou 324004, Peoples R China
3.Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Urumqi 830011, Peoples R China
4.Qilu Univ Technol, Inst Mat Sci & Engn, Jinan 250353, Peoples R China
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Su, LW ,Fu, JH ,Zhang, PJ ,et al. Uniform core-shell Cu6Sn5@C nanospheres with controllable synthesis and excellent lithium storage performances[J]. RSC ADVANCES,2017,7(45):28399-28406.
APA Su, LW ,Fu, JH ,Zhang, PJ ,Wang, LB ,Wang, YH ,&Ren, MM .(2017).Uniform core-shell Cu6Sn5@C nanospheres with controllable synthesis and excellent lithium storage performances.RSC ADVANCES,7(45),28399-28406.
MLA Su, LW ,et al."Uniform core-shell Cu6Sn5@C nanospheres with controllable synthesis and excellent lithium storage performances".RSC ADVANCES 7.45(2017):28399-28406.
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