SnSb micron-sized particles for Li-ion batteries
- 作者：L. Simonin ; U. Lafont ; E.M. Kelder
- 关键词：Li-ion battery ; Alloy ; SnSb ; Micron-sized particles ; Post-mortem TEM ; Negative electrode
- 刊名：Journal of Power Sources
- 出版年：2008
- 期刊代码：58_03787753
- 类别：ce
- 出版时间：1 June 2008
- 卷：180
- 期：2
- 页码：859-863
- 文件大小：989 K
摘要
Micrometre-sized particles of Sn/SnSb were produced with a simple technique consisting in melting commercial ingots of tin and antimony separately at 280 °C and 680 °C, respectively, and casting them together in a ceramic boat. The solid alloy was then crushed into a homogeneous powder by grinding and sieving. The obtained powder was characterised by X-ray diffraction, and electron microscopy. Elemental and phase composition analyses were performed via, inductive coupled plasma and differential scanning calorimetry, respectively. The material was further tested as electrode material in a lithium galvanic cell. It showed relatively good capacity retention for at least 15 cycles. TEM analysis on post-mortem electrode samples showed the formation of nanostructures after the first discharge followed by a progressive disappearance of the micron-sized particles upon further cycling. Fading at higher cycles is explained by the formation of isolated metallic nano-particles that become inactive for further storage of lithium.