Journal
ELECTROCHIMICA ACTA
Volume 318, Issue -, Pages 314-321Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.06.076
Keywords
Ge/GeO2; RGO; Three-dimensional cubic structure; Lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [51874362]
- Natural Science Foundation of Hunan Province [2018JJ1036]
- Program for New Century Excellent Talents in University [NCET-13-0594]
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Germanium-based materials has been considered as a promising anode material for Li-ion batteries due to their high theoretical capacity. Herein, we reported a novel Ge/GeO2-Reduced graphene oxide (GG-RGO) microcubes via one-step recombination using sodium borohydride as reductant, followed by a calcination process in reducing atmosphere. During the recombination, the reduced graphene oxide coated GeO2 nanoparticles self-assemble to form three-dimensional Ge shell/GeO2 core cubic structure. RGO coated construction can relieve volume expansion, provide a large reactive area and reduce distance for lithium diffusion. Meanwhile, two-phase Ge/GeO2 composite nanostructure can effectively increase specific capacity. Benefited from its unique three-dimensional structure, the Ge/GeO2-RGO composites exhibit high reversible capacity (1005 mAh g(-1) at 100 mA g(-1)), good cycling stability (a high reversible capacity of 933 mAh g(-1) after 50 cycles) and rate performance (740 mAh g(-1) at 2000 mAh g(-1)). (C) 2019 Elsevier Ltd. All rights reserved.
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