TY - JOUR
T1 - Si7Ti4Ni4 as a buffer material for Si and its electrochemical study for lithium ion batteries
AU - Lee, Kyung Jae
AU - Yu, Seung Ho
AU - Kim, Jung Joon
AU - Lee, Dae Hyeok
AU - Park, Jungjin
AU - Suh, Soon Sung
AU - Cho, Jong Soo
AU - Sung, Yung Eun
N1 - Funding Information:
This work was supported by the Institute for Basic Science (IBS) and Fundamental R&D Program for Technology of World Premier Materials funded by the Ministry of Knowledge Economy, Korea ( 10037919 ).
PY - 2014
Y1 - 2014
N2 - Nano-Si embedded Si7Ti4Ni4 is synthesized with the melt spinning method, which is facile, and applicable to mass-production. Si7Ti4Ni4, the buffer material, is electrochemically inactive toward lithium. Nevertheless, Si 7Ti4Ni4 has good electrical conductivity, in the order of 105 S m-1, which is more conductive than amorphous carbon that is usually used as a coating material for active material. Furthermore, the surrounding grain boundaries of Si7Ti 4Ni4 effectively relax volume expansion of Si. Therefore, it plays a critical role in maintaining the structure of electrode and the integrity of active materials. As a result, nano-Si embedded in Si 7Ti4Ni4 shows outstanding cycle performance over 50 cycles at 400 mA g-1, and it maintains 86% of its specific capacity at 3200 mA g-1, compared with that of 400 mA g-1. This indicates that nano-Si embedded in Si7Ti4Ni 4 can be a promising anode material for lithium ion batteries.
AB - Nano-Si embedded Si7Ti4Ni4 is synthesized with the melt spinning method, which is facile, and applicable to mass-production. Si7Ti4Ni4, the buffer material, is electrochemically inactive toward lithium. Nevertheless, Si 7Ti4Ni4 has good electrical conductivity, in the order of 105 S m-1, which is more conductive than amorphous carbon that is usually used as a coating material for active material. Furthermore, the surrounding grain boundaries of Si7Ti 4Ni4 effectively relax volume expansion of Si. Therefore, it plays a critical role in maintaining the structure of electrode and the integrity of active materials. As a result, nano-Si embedded in Si 7Ti4Ni4 shows outstanding cycle performance over 50 cycles at 400 mA g-1, and it maintains 86% of its specific capacity at 3200 mA g-1, compared with that of 400 mA g-1. This indicates that nano-Si embedded in Si7Ti4Ni 4 can be a promising anode material for lithium ion batteries.
KW - Buffer material
KW - Lithium ion battery
KW - Silicon
KW - Volume expansion
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U2 - 10.1016/j.jpowsour.2013.08.033
DO - 10.1016/j.jpowsour.2013.08.033
M3 - Article
AN - SCOPUS:84883540199
VL - 246
SP - 729
EP - 735
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -