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Mesoporous Ge/GeO2/Carbon Lithium-Ion Battery Anodes with High Capacity and High Reversibility.

Abstract
We report mesoporous composite materials (m-GeO2, m-GeO2/C, and m-Ge-GeO2/C) with large pore size which are synthesized by a simple block copolymer directed self-assembly. m-Ge/GeO2/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 GeO2 electrodes. m-Ge/GeO2/C exhibits one of the highest areal capacities (1.65 mA h cm(-2)) among previously reported Ge- and GeO2-based anodes. The superior electrochemical performance in m-Ge/GeO2/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.
AuthorsJongkook Hwang, Changshin Jo, Min Gyu Kim, Jinyoung Chun, Eunho Lim, Seongseop Kim, Sanha Jeong, Youngsik Kim, Jinwoo Lee
JournalACS nano (ACS Nano) Vol. 9 Issue 5 Pg. 5299-309 (May 26 2015) ISSN: 1936-086X [Electronic] United States
PMID25867753 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

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