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Synthesis and Characterization of Empty Silicon Clathrates for Anode Applications in Li-ion Batteries

  • Kwai S. Chan (a1), Michael A. Miller (a1), Carol Ellis-Terrell (a1) and Candace K. Chan (a2)

Abstract

Several processing methods were developed and evaluated for synthesizing empty silicon clathrates. A solution synthesis method based on the Hofmann-elimination oxidation reaction was successfully utilized to produce 20 mg of empty Si46. Half-cells using the Si46 electrodes were successfully cycled for 1000 cycles at rate of 5.3C. The capacity of the Si46 electrode in long-term tests was 675 mAh/g at the 4th cycle, but increased to 809 mAh/g at 50 cycles. The corresponding Coulombic efficiency was better than 99%. The capacity dropped from 809 to 553 mAh/g after 1000 cycles while maintaining a 99% Coulombic efficiency. In comparison, a Ba8Al8Si38 electrode could be cycled for about 200 cycles with a lower capacity and Coulombic efficiency. Potential applications of empty silicon clathrates as anode materials in Li-ion batteries are discussed.

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Corresponding author

*(Email: kchan@swri.org)

References

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1. Chan, K. S. and Miller, M. A., Anodes—Synthesis and Characterization of Silicon Clathrates for Anode Applications in Lithium-Ion Batteries, Energy Storage R&D, FY2014 Final Report, Southwest Research Institute, 2014.
2. Peng, X., Wei, Q., Li, Y., and Chan, C. K., J. Phys. Chem. C, 119, 2824728257 (2016).
3. Li, Y., Raghavan, R., Wagner, N. A., Davidowksi, S. K., Baggetto, L., Zhao, R., Cheng, Q., Yarger, J. L., Veith, G. M., Ellis-Terrell, C., Miller, M. A., Chan, K. S., and Chan, C. K., Advanced Science, 2015, 1500057. DOI: 10.1002/advs.201500057
4. Guloy, A. M., Ramlau, R., Tang, Z., Schnelle, W., Baitinger, M., and Grin, Y., Nature, 443, 320323 (2006). DOI: 10.1038/nature05145

Keywords

Synthesis and Characterization of Empty Silicon Clathrates for Anode Applications in Li-ion Batteries

  • Kwai S. Chan (a1), Michael A. Miller (a1), Carol Ellis-Terrell (a1) and Candace K. Chan (a2)

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