Stokes Killian, Flynn Grace, Geaney Hugh, Bree Gerard, Ryan Kevin M
Bernal Institute and Department of Chemical Sciences , University of Limerick , Limerick , V94 T9PX Ireland.
Nano Lett. 2018 Sep 12;18(9):5569-5575. doi: 10.1021/acs.nanolett.8b01988. Epub 2018 Aug 9.
Here, we report the application of axially heterostructured nanowires consisting of alternating segments of silicon and germanium with a tin seed as lithium-ion battery anodes. During repeated lithiation and delithiation, the heterostructures completely rearrange into a porous network of homogeneously alloyed SiGe ligaments. The transformation was characterized through ex situ TEM, STEM, and Raman spectroscopy. Electrochemical analysis was conducted on the heterostructure nanowires with discharge capacities in excess of 1180 mAh/g for 400 cycles (C/5) and capacities of up to 613 mAh/g exhibited at a rate of 10 C.
在此，我们报道了由硅和锗的交替段与锡籽晶组成的轴向异质结构纳米线作为锂离子电池阳极的应用。在反复的锂化和脱锂过程中，异质结构完全重排成均匀合金化的硅锗韧带的多孔网络。通过非原位透射电子显微镜（TEM）、扫描透射电子显微镜（STEM）和拉曼光谱对该转变进行了表征。对异质结构纳米线进行了电化学分析，其在400次循环（C/5）中的放电容量超过1180 mAh/g，在10 C的倍率下表现出高达613 mAh/g的容量。
