Pb-sandwiched nanoparticles as anode material for lithium-ion batteries
Pb-sandwiched nanoparticles as anode material for lithium-ion batteries
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铅夹心纳米粒子作为锂离子电池负极材料
DOI：
10.1007/s10008-011-1333-8
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发表时间：
2012-01-01
影响因子：
2.5
通讯作者：
Yang, Hanxi
中科院分区：
文献类型：
--
作者：
Chen, Zhongxue;Cao, Yuliang;Yang, Hanxi
采用简单的球磨法制备了三明治结构的SiC@Pb@C纳米复合材料，并通过X射线衍射、X射线光电子能谱、扫描电子显微镜和透射电子显微镜对其进行了表征。与裸铅阳极相比，SiC@Pb@C纳米复合材料具有更高的可逆容量和循环寿命。在0.005 - 1.0 V之间的电位区间内进行600次充电和放电循环后，可保持> 1，586 mAh cm−3（207 mAh g−1）的可逆体积容量，这远远超过文献中先前报道的容量。增强的电化学性能归因于三明治结构，其中纳米尺寸的Pb颗粒锚定在刚性SiC核和外部碳壳之间，减轻了合金化/去合金化过程中Pb中间层的大体积变化所造成的损害。
A sandwiched SiC@Pb@C nanocomposite was prepared through a simple ball-milling route and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The SiC@Pb@C nanocomposite exhibits a much improved reversible capacity and cycling life as compared with a bare Pb anode. A reversible volumetric capacity of >1,586 mAh cm−3(207 mAh g−1) can be maintained after 600 cycles of charge and discharge in the potential interval between 0.005 and 1.0 V, which far exceeds those reported previously in the literature. The enhanced electrochemical performance is ascribed to the sandwiched structure in which nanosized Pb particles were anchored in between the rigid SiC core and the outer carbon shell, mitigating the damage done by the large volume change of the Pb interlayer during the alloying/dealloying process.