Improved electrochemical behavior of W-coated SiO-graphite composite anode in lithium-ion secondary battery
- Authors
- Yom, Jee Ho; Lee, Jun Kyu; Yoon, 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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