Germanium on seamless graphene carbon nanotube hybrids for lithium ion anodes

Title
Germanium on seamless graphene carbon nanotube hybrids for lithium ion anodes
Authors
이승기김남동Caitian GaoRodrigo Villegas SalvatierraLei LiYilun LiJunwei ShaGladys A. Lopez SilvaHuilong FeiErqing XieJames M. Tour
Keywords
Graphene carbon nanotube hybrid; Seamless connection; Germanium; Lithium ion batteries; Rate capability
Issue Date
2017-10
Publisher
Carbon
Citation
VOL 123-439
Abstract
Germanium is a promising anode for lithium ion batteries (LIB) because of its potential rate capability and high theoretical specific capacity. Here we demonstrate a seamlessly connected graphene and carbon nanotube (GCNT) hybrid that serves as an integral current collector for a Ge anode. A vertically aligned CNT (VA-CNT) forest grown on graphene provides a high surface area for Ge deposition. The seamless connection between graphene and VA-CNT facilitates electron transport from the Ge to the Cu current collector. Graphene serves to alleviate mechanical strain between the electrode and current collector. The mechanical resilience of the GCNT lessens Ge pulverization on charge/discharge of the LIB. As a result, the Ge/GCNT anode has a high specific capacity of 1315 mAh/g after 200 cycles at 0.5 A/g and a high rate performance of 803 mAh/g at 40 A/g.
URI
http://pubs.kist.re.kr/handle/201004/66710
ISSN
0008-6223
Appears in Collections:
KIST Publication > Article
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