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Improved electrochemical behavior of W-coated SiO-graphite composite anode in lithium-ion secondary battery

Authors
Yom, Jee HoLee, Jun KyuYoon, Woo Young
Issue Date
5월-2015
Publisher
SPRINGER
Keywords
Silicon monoxide; Tungsten; Graphite; Lithium-ion secondary battery; Physical vapor deposition
Citation
JOURNAL OF APPLIED ELECTROCHEMISTRY, v.45, no.5, pp.397 - 403
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume
45
Number
5
Start Page
397
End Page
403
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/93692
DOI
10.1007/s10800-015-0810-7
ISSN
0021-891X
Abstract
The electrochemical performance of a W-coated SiO-graphite composite anode was evaluated in Li-ion secondary coin cells. Tungsten was coated onto the SiO-graphite composite electrode by physical vapor deposition. The layered structure of the W-coated electrode was imaged using transmission electron microscopy and the uniformity of the coating was confirmed by electron probe microanalysis. In coin cells, the W-coated electrode showed a higher retention capacity and discharge capacity than the uncoated electrode at a C rate of 0.5 C after 100 cycles. The discharge capacity of the coated cell was 566 mAh g(-1) after the 1st cycle and 358 mAh g(-1) after the 100th cycle at a C rate of 0.5 C, whereas that of the uncoated cell was 517 mAh g(-1) after the 1st cycle and 269 mAh g(-1) after the 100th cycle. The retention capacity of the coated cell was 63.2 % after 100 cycles, whereas that of the uncoated cell was 52.0 %. A comparison of the W-coated and uncoated electrodes after 100 cycles revealed that the W layer, which has superior conductivity and mechanical properties, improved the electrochemical performance of the electrode. Impedance analysis also confirmed that the W coating enhanced the cell performance.
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공과대학 (신소재공학부)
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