Synthesis and Characterization of Empty Silicon Clathrates for Anode Applications in Li-ion Batteries
Synthesis and Characterization of Empty Silicon Clathrates for Anode Applications in Li-ion Batteries
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DOI：
10.1557/adv.2016.434
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发表时间：
2016-01-01
期刊：
影响因子：
0.8
通讯作者：
Chan, Candace K.
中科院分区：
文献类型：
--
作者：
Chan, Kwai S.;Miller, Michael A.;Chan, Candace K.
开发并评价了几种制备空硅笼形物的方法。成功地利用基于霍夫曼消除氧化反应的溶液合成方法来生产20 mg空Si-46。使用Si-46电极的半电池以5.3C的速率成功地循环1000次循环。Si-46电极在长期测试中的容量在第4次循环时为675 mAh/g，但在50次循环时增加到809 mAh/g。相应的库仑效率优于99%。在1000次循环后，容量从809 mAh/g下降到553 mAh/g，同时保持99%的库仑效率。相比之下，Ba 8Al 8 Si 38电极可以循环约200次，具有较低的容量和库仑效率。讨论了空硅笼形化合物作为锂离子电池负极材料的潜在应用。
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 Si-46. Half-cells using the Si-46 electrodes were successfully cycled for 1000 cycles at rate of 5.3C. The capacity of the Si-46 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.