GeOx/Reduced Graphene Oxide Composite as an Anode for Li-ion Batteries: Enhanced Capacity via Reversible Utilization of Li2O along with Improved Rate Performance

Journal Article · Mon Sep 01 04:00:00 EDT 2014 · Advanced Functional Materials, 24(8):1059-1066

DOI:https://doi.org/10.1002/adfm.201301882· OSTI ID:1168913

Lv, Dongping; Gordin, Mikhail; Yi, Ran; Xu, Terrence ^[1]; Song, Jiangxuan; Jiang, Yingbing; Choi, Daiwon; Wang, Donghai

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1. Tianren

A self-assembled GeOx/reduced graphene oxide (GeOx/RGO) composite, where GeOx nanoparticles were grown directly on reduced graphene oxide sheets, was 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 mAhg-1 at a current density of 100 mAg-1, and still maintains a capacity of 410 mAhg-1 at a high current density of 20 Ag-1. Owing to the flexible reduced graphene oxide sheets enwrapping the GeOx particles, the cycling stability of the composite was also improved significantly. To further demonstrate its feasibility in practical applications, the synthesized GeOx/RGO composite anode was successfully paired with a high voltage LiNi0.5Mn1.5O4 cathode to form a full cell, which showed good cycling and rate performance.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1168913
• Report Number(s): PNNL-SA-98096; TE1400000
• Journal Information: Advanced Functional Materials, 24(8):1059-1066, Journal Name: Advanced Functional Materials, 24(8):1059-1066
• Country of Publication: United States
• Language: English

Related Subjects

Anode
GeOx
Graphene Oxide
Li-ion batteries