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.
| Original language | English |
|---|---|
| Pages (from-to) | 3043-3048 |
| Number of pages | 6 |
| Journal | MRS Advances |
| Volume | 1 |
| Issue number | 45 |
| DOIs | |
| Publication status | Published - Jan 1 2016 |
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ASJC Scopus subject areas
- Mechanical Engineering
- Mechanics of Materials
- Materials Science(all)
- Condensed Matter Physics
Cite this
Synthesis and characterization of empty silicon clathrates for anode applications in Li-ion batteries. / Chan, Kwai S.; Miller, Michael A.; Ellis-Terrell, Carol; Chan, Candace.
In: MRS Advances, Vol. 1, No. 45, 01.01.2016, p. 3043-3048.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Synthesis and characterization of empty silicon clathrates for anode applications in Li-ion batteries
AU - Chan, Kwai S.
AU - Miller, Michael A.
AU - Ellis-Terrell, Carol
AU - Chan, Candace
PY - 2016/1/1
Y1 - 2016/1/1
N2 - 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.
AB - 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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U2 - 10.1557/adv.2016.434
DO - 10.1557/adv.2016.434
M3 - Article
VL - 1
SP - 3043
EP - 3048
JO - MRS Advances
JF - MRS Advances
SN - 2059-8521
IS - 45
ER -