Effect of electrolyte on cycle performances of the electrodeposited Sn-O-C composite anode of lithium secondary batteries

JOURNAL OF POWER SOURCES

卷:275

Article

Jeong, Moongook^1,2  Yokoshima, Tokihiko²  Nara, Hiroki²  Momma, Toshiyuki^1,2  Osaka, Tetsuya^1,2 

[1] Waseda Univ, Grad Sch Adv Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan

[2] Waseda Univ, Fac Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan

关键词: Tin;    Anode;    Sn-O-C composite;    Electrodeposition;    Electrolyte;    Lithium secondary batteries;   

DOI  :  10.1016/j.jpowsour.2014.11.008

来源: Elsevier

【 摘 要 】

The electrodeposited Sn-O-C composite anode cycling with LiClO4 delivered stable cycle performances showing discharge capacity of 473 mA h g Risri with 95% of coulombic efficiency at 100th cycle. However, the anode showed poor cycle performances with LiPF6 delivering discharge capacity of 69 mA h g(-1) of sn at 100th cycle with 70% of coulombic efficiency. Electrochemical investigation performed by cyclic voltammetry and differential capacity plots revealed that the Sn-O-C composite cycling with LiPF86 suffered from retarded phase transition reaction between Li and Sn during charge/discharge process. X-ray photoelectron spectroscopy declared the existence of fluorinated-Sn and LiF. Moreover, energy dispersive X-ray spectroscopy found increase in their amount with repeated cycles. The morphologies of the Sn-O-C composite cycled with LiPF6 showed aggregated particles containing the chemical state of fluorinated-Sn and LiF on its surface. Furthermore, the significant pulverization and aggregation of the active material were observed from the Sn-O-C composite cycled by LiPF6 rather than that of LiClO4, which was probably promoted by the generated HF strongly corroding metallic component. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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