GeOx/reduced graphene oxide composite as an anode for li-ion batteries

Enhanced capacity via reversible utilization of Li2O along with improved rate performance

Dongping Lv, Mikhail L. Gordin, Ran Yi, Terrence Xu, Jiangxuan Song, Ying Bing Jiang, Daiwon Choi, Donghai Wang

Research output: Contribution to journalArticle

106 Citations (Scopus)

Abstract

A self-assembled GeOx/reduced graphene oxide (GeO x/RGO) composite, where GeOx nanoparticles are grown directly on reduced graphene oxide sheets, is synthesized via a facile one-step reduction approach and studied by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectroscopy, electron energy loss spectroscopy elemental mapping, and other techniques. Electrochemical evaluation indicates that incorporation of reduced graphene oxide enhances both the rate capability and reversible capacity of GeOx, with the latter being due to the RGO enabling reversible utilization of Li2O. The composite delivers a high reversible capacity of 1600 mAh g-1 at a current density of 100 mA g-1, and still maintains a capacity of 410 mAh g-1 at a high current density of 20 A g-1. Owing to the flexible reduced graphene oxide sheets enwrapping the GeOx particles, the cycling stability of the composite is also improved significantly. To further demonstrate its feasibility in practical applications, the synthesized GeOx/RGO composite anode is successfully paired with a high voltage LiNi0.5Mn1.5O4 cathode to form a full cell, which shows good cycling and rate performance. A GeOx/reduced graphene oxide (RGO) composite, where amorphous GeOx (1.01 < x < 1.07) nanoparticles are in intimate contact with well-dispersed RGO sheets, is successfully synthesized via a facile one-step reduction approach. The introduction of conductive RGO sheets into germanium oxide is a simple but effective strategy for enhancing the reversible utilization of Li2O and improving rate capability for Li+ storage in germanium oxides.

Original languageEnglish (US)
Pages (from-to)1059-1066
Number of pages8
JournalAdvanced Functional Materials
Volume24
Issue number8
DOIs
StatePublished - Feb 26 2014

Fingerprint

Graphite
Oxides
Graphene
electric batteries
graphene
Anodes
anodes
composite materials
oxides
Composite materials
ions
Germanium oxides
germanium oxides
Current density
current density
Nanoparticles
Lithium-ion batteries
nanoparticles
cycles
Electron energy loss spectroscopy

All Science Journal Classification (ASJC) codes

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Lv, Dongping ; Gordin, Mikhail L. ; Yi, Ran ; Xu, Terrence ; Song, Jiangxuan ; Jiang, Ying Bing ; Choi, Daiwon ; Wang, Donghai. / GeOx/reduced graphene oxide composite as an anode for li-ion batteries : Enhanced capacity via reversible utilization of Li2O along with improved rate performance. In: Advanced Functional Materials. 2014 ; Vol. 24, No. 8. pp. 1059-1066.
@article{ed59d5d69d22491eb41eb43ca12116ad,
title = "GeOx/reduced graphene oxide composite as an anode for li-ion batteries: Enhanced capacity via reversible utilization of Li2O along with improved rate performance",
abstract = "A self-assembled GeOx/reduced graphene oxide (GeO x/RGO) composite, where GeOx nanoparticles are grown directly on reduced graphene oxide sheets, is synthesized via a facile one-step reduction approach and studied by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectroscopy, electron energy loss spectroscopy elemental mapping, and other techniques. Electrochemical evaluation indicates that incorporation of reduced graphene oxide enhances both the rate capability and reversible capacity of GeOx, with the latter being due to the RGO enabling reversible utilization of Li2O. The composite delivers a high reversible capacity of 1600 mAh g-1 at a current density of 100 mA g-1, and still maintains a capacity of 410 mAh g-1 at a high current density of 20 A g-1. Owing to the flexible reduced graphene oxide sheets enwrapping the GeOx particles, the cycling stability of the composite is also improved significantly. To further demonstrate its feasibility in practical applications, the synthesized GeOx/RGO composite anode is successfully paired with a high voltage LiNi0.5Mn1.5O4 cathode to form a full cell, which shows good cycling and rate performance. A GeOx/reduced graphene oxide (RGO) composite, where amorphous GeOx (1.01 < x < 1.07) nanoparticles are in intimate contact with well-dispersed RGO sheets, is successfully synthesized via a facile one-step reduction approach. The introduction of conductive RGO sheets into germanium oxide is a simple but effective strategy for enhancing the reversible utilization of Li2O and improving rate capability for Li+ storage in germanium oxides.",
author = "Dongping Lv and Gordin, {Mikhail L.} and Ran Yi and Terrence Xu and Jiangxuan Song and Jiang, {Ying Bing} and Daiwon Choi and Donghai Wang",
year = "2014",
month = "2",
day = "26",
doi = "10.1002/adfm.201301882",
language = "English (US)",
volume = "24",
pages = "1059--1066",
journal = "Advanced Functional Materials",
issn = "1616-301X",
publisher = "Wiley-VCH Verlag",
number = "8",

}

GeOx/reduced graphene oxide composite as an anode for li-ion batteries : Enhanced capacity via reversible utilization of Li2O along with improved rate performance. / Lv, Dongping; Gordin, Mikhail L.; Yi, Ran; Xu, Terrence; Song, Jiangxuan; Jiang, Ying Bing; Choi, Daiwon; Wang, Donghai.

In: Advanced Functional Materials, Vol. 24, No. 8, 26.02.2014, p. 1059-1066.

Research output: Contribution to journalArticle

TY - JOUR

T1 - GeOx/reduced graphene oxide composite as an anode for li-ion batteries

T2 - Enhanced capacity via reversible utilization of Li2O along with improved rate performance

AU - Lv, Dongping

AU - Gordin, Mikhail L.

AU - Yi, Ran

AU - Xu, Terrence

AU - Song, Jiangxuan

AU - Jiang, Ying Bing

AU - Choi, Daiwon

AU - Wang, Donghai

PY - 2014/2/26

Y1 - 2014/2/26

N2 - A self-assembled GeOx/reduced graphene oxide (GeO x/RGO) composite, where GeOx nanoparticles are grown directly on reduced graphene oxide sheets, is synthesized via a facile one-step reduction approach and studied by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectroscopy, electron energy loss spectroscopy elemental mapping, and other techniques. Electrochemical evaluation indicates that incorporation of reduced graphene oxide enhances both the rate capability and reversible capacity of GeOx, with the latter being due to the RGO enabling reversible utilization of Li2O. The composite delivers a high reversible capacity of 1600 mAh g-1 at a current density of 100 mA g-1, and still maintains a capacity of 410 mAh g-1 at a high current density of 20 A g-1. Owing to the flexible reduced graphene oxide sheets enwrapping the GeOx particles, the cycling stability of the composite is also improved significantly. To further demonstrate its feasibility in practical applications, the synthesized GeOx/RGO composite anode is successfully paired with a high voltage LiNi0.5Mn1.5O4 cathode to form a full cell, which shows good cycling and rate performance. A GeOx/reduced graphene oxide (RGO) composite, where amorphous GeOx (1.01 < x < 1.07) nanoparticles are in intimate contact with well-dispersed RGO sheets, is successfully synthesized via a facile one-step reduction approach. The introduction of conductive RGO sheets into germanium oxide is a simple but effective strategy for enhancing the reversible utilization of Li2O and improving rate capability for Li+ storage in germanium oxides.

AB - A self-assembled GeOx/reduced graphene oxide (GeO x/RGO) composite, where GeOx nanoparticles are grown directly on reduced graphene oxide sheets, is synthesized via a facile one-step reduction approach and studied by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectroscopy, electron energy loss spectroscopy elemental mapping, and other techniques. Electrochemical evaluation indicates that incorporation of reduced graphene oxide enhances both the rate capability and reversible capacity of GeOx, with the latter being due to the RGO enabling reversible utilization of Li2O. The composite delivers a high reversible capacity of 1600 mAh g-1 at a current density of 100 mA g-1, and still maintains a capacity of 410 mAh g-1 at a high current density of 20 A g-1. Owing to the flexible reduced graphene oxide sheets enwrapping the GeOx particles, the cycling stability of the composite is also improved significantly. To further demonstrate its feasibility in practical applications, the synthesized GeOx/RGO composite anode is successfully paired with a high voltage LiNi0.5Mn1.5O4 cathode to form a full cell, which shows good cycling and rate performance. A GeOx/reduced graphene oxide (RGO) composite, where amorphous GeOx (1.01 < x < 1.07) nanoparticles are in intimate contact with well-dispersed RGO sheets, is successfully synthesized via a facile one-step reduction approach. The introduction of conductive RGO sheets into germanium oxide is a simple but effective strategy for enhancing the reversible utilization of Li2O and improving rate capability for Li+ storage in germanium oxides.

UR - http://www.scopus.com/inward/record.url?scp=84894434300&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84894434300&partnerID=8YFLogxK

U2 - 10.1002/adfm.201301882

DO - 10.1002/adfm.201301882

M3 - Article

VL - 24

SP - 1059

EP - 1066

JO - Advanced Functional Materials

JF - Advanced Functional Materials

SN - 1616-301X

IS - 8

ER -