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

被引：66

作者：

Cho, Yong Jae ^{[1
]}

Kim, Chang Hyun ^{[1
]}

Im, Hyung Soon ^{[1
]}

Myung, Yoon ^{[1
]}

Kim, Han Sung ^{[1
]}

Back, Seung Hyuk ^{[1
]}

Lim, Young Rok ^{[1
]}

Jung, Chan Su ^{[1
]}

Jang, Dong Myung ^{[1
]}

Park, Jeunghee ^{[1
]}

Lim, Sang Hoo ^{[2
]}

Cha, Eun Hee ^{[2
]}

Bae, Ki Yoon ^{[3
]}

Song, Min Seob ^{[3
]}

Cho, Won Il ^{[3
]}

机构：

[1] Korea Univ, Dept Chem, Jochiwon 339700, South Korea

[2] Hoseo Univ, Dept Liberal Art & Literature, Chungnam 336795, South Korea

[3] Korea Inst Sci & Technol, Ctr Energy Convergence, Seoul 136791, South Korea

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2013年 / 15卷 / 28期

关键词：

HIGH-CAPACITY; ANODE MATERIAL; GE; LI; SN; NANOPARTICLES; NANOWIRES; COMPOSITE; NANOCOMPOSITE; ELECTRODES;

D O I：

10.1039/c3cp51366a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：11691 / 11695

页数：5

共 38 条

[1] Ge-Sn semiconductors for band-gap and lattice engineering [J].