Germanium?tin alloy nanocrystals for high-performance lithium ion batteries

Title
Germanium?tin alloy nanocrystals for high-performance lithium ion batteries
Authors
Yong Che ChoChang Hyun KimHyung Soo ImYoon MyungHan Sung KimSeung Hyuk BackYoung Rok LimChan Su JungDong Myung JangJeunghee ParkSang Hoo KimEun Hee ChaKi Yoon BaeMin Seob Song조원일
Keywords
Ge-Sn; nanocrystal; laser-photo synthesis; anode; lithium ion battery
Issue Date
2013-05
Publisher
Physical chemistry chemical physics : PCCP
Citation
VOL 15, 11691-11695
Abstract
Germanium-tin (Ge1-xSnx) alloy nanocrystals were synthesized using a gas-phase laser photolysis reaction of tetramethyl germanium and tetramethyl tin. A composition tuning was achieved using the partial pressure of precursors in a closed reactor. For x < 0.1, cubic phase alloy nanocrystals were exclusively produced without separation of the tetragonal phase Sn metal. In the range of x = 0.1-0.4, unique Ge1-xSnx-Sn alloy-metal hetero-junction nanocrystals were synthesized, where the Sn metal domain becomes dominant with x. Thin graphitic carbon layers usually sheathed the nanocrystals. We investigated the composition-dependent electrochemical properties of these nanocrystals as anode materials of lithium ion batteries. Incorporation of Sn (x = 0.05) significantly increased the capacities (1010 mA h g(-1) after 50 cycles) and rate capabilities, which promises excellent electrode materials for the development of high-performance lithium batteries.
URI
http://pubs.kist.re.kr/handle/201004/58741
ISSN
14639076
Appears in Collections:
KIST Publication > Article
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