Highly reversible lithium storage in a 3D macroporous Ge@C composite

A porous Ge@C composite was synthesized by magnesiothermic reduction reaction of GeO 2 , Mg powder and glucose followed by an etching process with HCl solution. Compared to a porous Ge electrode, the porous Ge@C composite electrode delivers better cycling stability (∼100% capacity retention after 10...

Full description

Saved in:
Bibliographic Details
Published in:RSC advances 2014, Vol.4 (71), p.37746-37751
Main Authors: Cheng, Jianxiu, Wang, Jiaqing, Li, Weihan, Liu, Xiaowu, Yu, Yan
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A porous Ge@C composite was synthesized by magnesiothermic reduction reaction of GeO 2 , Mg powder and glucose followed by an etching process with HCl solution. Compared to a porous Ge electrode, the porous Ge@C composite electrode delivers better cycling stability (∼100% capacity retention after 100 cycles at the 0.2 C rate) and higher rate capability (440 mA h g −1 at 1800 mA g −1 ). The improved electrochemical performance results from the synergistic effect of the 3D interconnected porous structure and the carbon shells. The local pores could buffer the volume change and the conductive carbon shell could prevent the aggregation of Ge as well as enhance the electronic conductivity of the whole electrode.
ISSN:2046-2069
2046-2069
DOI:10.1039/C4RA05043F