Mesoporous Ge/Geo?/Carbon Lithi
By Hwang, Jongkook; Jo, Changshin; Kim, Min Gyu; Chun, Jinyoung; Lim, Eunho; Kim, Seongseop; Jeong, Sanha; Kim, Youngsik & Lee, Jinwoo
Published in ACS Nano
NULL
2015
Abstract
We report mesoporous composite materials (m-Geo?, m-Geo?/C, and m-Ge-Geo?/C) with large pore size which are synthesized by a simple block copolymer directed self-assembly. m-Ge/Geo?/C shows greatly enhanced Coulombic efficiency, high reversible capacity (1631 mA h g-1), and stable cycle life compared with the other mesoporous and bulk Geo? electrodes. m-Ge/Geo?/C exhibits one of the highest areal capacities (1.65 mA h cm-2) among previously reported Ge- and Geo?-based anodes. The superior electrochemical performance in m-Ge/Geo?/C arises from the highly improved kinetics of conversion reaction due to the synergistic effects of the mesoporous structures and the conductive carbon and metallic Ge.
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