Sn-Based Nanocomposite for Li-Ion Battery Anode with High Energy Density, Rate Capability, and Reversibility
- Authors
- Park, Min-Gu; Lee, Dong-Hun; Jung, Heechul; Choi, Jeong-Hee; Park, Cheol-Min
- Issue Date
- Mar-2018
- Publisher
- AMER CHEMICAL SOC
- Keywords
- lithium-ion batteries; anode materials; tin-based compound anodes; reaction mechanism; nanocomposite electrodes
- Citation
- ACS NANO, v.12, no.3, pp 2955 - 2967
- Pages
- 13
- Journal Title
- ACS NANO
- Volume
- 12
- Number
- 3
- Start Page
- 2955
- End Page
- 2967
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/22199
- DOI
- 10.1021/acsnano.8b00586
- ISSN
- 1936-0851
1936-086X
- Abstract
- To design an easily manufactured, large energy density, highly reversible, and fast rate-capable Li-ion battery (LIB) anode, Co-Sn intermetallics (CoSn2, CoSn, and Co3Sn2) were synthesized, and their potential as anode materials for LIBs was investigated. Based on their electrochemical performances, CoSn2 was selected, and its C-modified nanocomposite (CoSn2/C) as well as Ti- and C-modified nanocomposite (CoSn2/a-TiC/C) was straightforwardly prepared. Interestingly, the CoSn2, CoSn2/C, and CoSn2/a-TiC/C showed conversion/nonrecombination, conversion/partial recombination, and conversion/full recombination during Li insertion/extraction, respectively, which were thoroughly investigated using ex situ X-ray diffraction and extended X-ray absorption fine structure analyses. As a result of the interesting conversion/full recombination mechanism, the easily manufactured CoSn2/a-TiC/C nanocomposite for the Sn-based Li-ion battery anode showed large energy density (first reversible capacity of 1399 mAh cm(-3)), high reversibility (first Coulombic efficiency of 83.2%), long cycling behavior (100% capacity retention after 180 cycles), and fast rate capability (appoximately 1110 mAh cm(-3) at 3C rate). In addition, degradation/enhancement mechanisms for high-capacity and high-performance Li-alloy-based anode materials for next-generation LIBs were also suggested.
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