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Synthesis of Ultrathin GeO 2 –Reduced Graphene Oxide (RGO) Sheets for a High‐Capacity Lithium‐Ion Battery Anode
Author(s) -
Ma DeLong,
Yuan Shuang,
Huang XiaoLei,
Cao ZhanYi
Publication year - 2014
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201300167
Subject(s) - graphene , anode , materials science , oxide , lithium (medication) , battery (electricity) , nanotechnology , composite number , chemical engineering , lithium ion battery , nanoparticle , thermal stability , current density , ion , electrode , composite material , metallurgy , chemistry , organic chemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
GeO 2 is a promising high‐performance anode material for Li‐ion batteries (LIBs) because of its high theoretical reversible capacity, low operation voltage, and high thermal stability. Herein, a simple, cheap, and easily scaled‐up synthetic procedure for preparing ultrathin GeO 2 –reduced graphene oxide (RGO) sheets is proposed and realized through a freeze‐drying method. The as‐prepared GeO 2 –RGO show non‐aggregated graphene sheets and homogeneously dispersed GeO 2 nanoparticles. As a high‐performance anode material for LIBs, the composite shows a high specific capacity (1200 mAh g −1 at current density of 100 mA g −1 ), good cycling performance, and rate capability.