期刊
NANOMATERIALS
卷 11, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/nano11020319
关键词
germanium oxide; graphene composite; anode material; lithium-ion battery
类别
资金
- National Research Foundation of Korea (NRF) - South Korean Ministry of Science and ICT [NRF2018R1D1A3B07047285]
A Ge/GeO2/graphene composite material was synthesized to address the volume expansion issue of germanium/germanium oxide nanoparticles during charge/discharge cycles. The material showed superior cycling stability by trapping Ge/GeO2 nanoparticles between graphene nanosheets to offset the volume expansion effect. Transmission electron microscopy images confirmed the distribution of Ge/GeO2 nanoparticles on graphene nanosheets.
Germanium/germanium oxide nanoparticles with theoretically high discharge capacities of 1624 and 2152 mAh/g have attracted significant research interest for their potential application as anode materials in Li-ion batteries. However, these materials exhibit poor long-term performance due to the large volume change of 370% during charge/discharge cycles. In the present study, to overcome this shortcoming, a Ge/GeO2/graphene composite material was synthesized. Ge/GeO2 nanoparticles were trapped between matrices of graphene nanosheets to offset the volume expansion effect. Transmission electron microscopy images revealed that the Ge/GeO2 nanoparticles were distributed on the graphene nanosheets. Discharge/charge experiments were performed to evaluate the Li storage properties of the samples. The discharge capacity of the bare Ge/GeO2 nanoparticles in the first discharge cycle was considerably large; however, the value decreased rapidly with successive cycles. Conversely, the present Ge/GeO2/graphene composite exhibited superior cycling stability.
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