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.
Original language | English |
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Pages (from-to) | 5299-5309 |
Number of pages | 11 |
Journal | ACS Nano |
Volume | 9 |
Issue number | 5 |
DOIs | |
State | Published - 26 May 2015 |
Keywords
- block copolymer
- catalytic function
- germanium oxide
- lithium-ion batteries
- mesoporous materials