Type I Clathrates as Novel Silicon Anodes: An Electrochemical and Structural Investigation.
Type I Clathrates as Novel Silicon Anodes: An Electrochemical and Structural Investigation.
复制标题
DOI：
10.1002/advs.201500057
复制
发表时间：
2015-06
期刊：
影响因子：
15.1
通讯作者：
Chan, Candace K.
中科院分区：
文献类型：
--
作者：
Li, Ying;Raghavan, Rahul;Wagner, Nicholas A.;Davidowski, Stephen K.;Baggetto, Loic;Zhao, Ran;Cheng, Qian;Yarger, Jeffery L.;Veith, Gabriel M.;Ellis-Terrell, Carol;Miller, Michael A.;Chan, Kwai S.;Chan, Candace K.
硅包合物含有笼状结构，可以封装各种客体原子或分子。本文介绍了基于Ba 8AlySi 46 −y的I型硅笼形化合物作为锂离子电池负极材料的电化学评估。核磁共振和X射线衍射的循环后表征表明，即使在电化学插入44 Li（101 Li/Si）到笼形结构中后，也没有明显的结构或体积变化。所观察到的性质与其他硅阳极的锂化形成鲜明对比，其他硅阳极变成无定形的并且遭受大的体积变化。电化学反应被提议在锂化和脱锂期间分别在相对于Li/Li+约0.2和0.4 V下作为单相反应发生，这与金刚石立方或非晶硅阳极不同。在5 mA g−1倍率下，观察到组成为Ba8Al8.54Si37.46的硅笼形物的可逆容量高达499 mAh g−1，对应于1.18 Li/Si。这些结果表明，硅笼形物可能是锂离子电池的有前途的耐用阳极。
Silicon clathrates contain cage‐like structures that can encapsulate various guest atoms or molecules. An electrochemical evaluation of type I silicon clathrates based on Ba8AlySi46−y as the anode material for lithium‐ion batteries is presented here. Postcycling characterization with nuclear magnetic resonance and X‐ray diffraction shows no discernible structural or volume changes even after electrochemical insertion of 44 Li (≈1 Li/Si) into the clathrate structure. The observed properties are in stark contrast with lithiation of other silicon anodes, which become amorphous and suffer from large volume changes. The electrochemical reactions are proposed to occur as single phase reactions at approximately 0.2 and 0.4 V versus Li/Li+ during lithiation and delithiation, respectively, distinct from diamond cubic or amorphous silicon anodes. Reversible capacities as high as 499 mAh g−1 at a 5 mA g−1 rate were observed for silicon clathrate with composition Ba8Al8.54Si37.46, corresponding to ≈1.18 Li/Si. These results show that silicon clathrates could be promising durable anodes for lithium‐ion batteries.
登录
查看更多内容
影响因子：
9.5
作者：
Bhandavat, R.;Singh, G.
通讯作者：
Singh, G.
影响因子：
16.6
作者：
EVERS, J;OEHLINGER, G;SEXTL, G
通讯作者：
SEXTL, G
影响因子：
3.9
作者：
Hatchard, TD;Dahn, JR
通讯作者：
Dahn, JR
影响因子：
56.9
作者：
KASPER, JS;HAGENMULLER, P;CROS, C
通讯作者：
CROS, C
影响因子：
38.3
作者：
Chan, Candace K.;Peng, Hailin;Cui, Yi
通讯作者：
Cui, Yi