ZnO decorated germanium nanoparticles as anode materials in Li-ion batteries.

Citation data:

Nanotechnology, ISSN: 1361-6528, Vol: 28, Issue: 9, Page: 095402

Publication Year:
2017
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/21899
PMID:
28067209
DOI:
10.1088/1361-6528/aa57b2
Author(s):
Kim, Tae-Hee; Park, Song Yi; Lee, Tack Ho; Jeong, Jaeki; Kim, Dong Suk; Swihart, Mark T; Song, Hyun-Kon; Kim, Jin Young; Kim, Seongbeom
Publisher(s):
IOP Publishing; IOP PUBLISHING LTD
Tags:
Chemical Engineering; Chemistry; Materials Science; Engineering; germanium nanoparticle; ZnO nanoparticle; laser pyrolysis; lithium ion battery; anode material
article description
Germanium exhibits high charge capacity and high lithium diffusivity, both are the key requirements for electrode materials in high performance lithium ion batteries (LIBs). However, high volume expansion and segregation from the electrode during charge-discharge cycling have limited use of germanium in LIBs. Here, we demonstrate that ZnO decorated Ge nanoparticles (Ge@ZnO NPs) can overcome these limitations of Ge as an LIB anode material. We produced Ge NPs at high rates by laser pyrolysis of GeH, then coated them with solution phase synthesized ZnO NPs. Half-cell tests revealed dramatically enhanced cycling stability and higher rate capability of Ge@ZnO NPs compared to Ge NPs. Enhancements arise from the core-shell structure of Ge@ZnO NPs as well as production of metallic Zn from the ZnO layer. These findings not only demonstrate a new surface treatment for Ge NPs, but also provide a new opportunity for development of high-rate LIBs.