A Yolk-Shell Design for Stabilized and Scalable Li-Ion Battery Alloy Anodes

被引：1699

作者：

Liu, Nian ^{[2
]}

Wu, Hui ^{[1
]}

McDowell, Matthew T. ^{[1
]}

Yao, Yan ^{[1
]}

Wang, Chongmin ^{[3
]}

Cui, Yi ^{[1
,4
]}

机构：

[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Chem, Stanford, CA 94305 USA

[3] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA

[4] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

来源：

NANO LETTERS | 2012年 / 12卷 / 06期

基金：

美国国家科学基金会;

关键词：

Silicon nanoparticle; Li-ion battery; anode; yolk-shell; solid-electrolyte interphase; in situ TEM; ELECTROCHEMICAL PERFORMANCE; SILICON NANOWIRES; HIGH-CAPACITY; LITHIUM; SIZE; NANOPARTICLES; MICROSPHERES; ELECTRODE; FRACTURE; SPHERES;

D O I：

10.1021/nl3014814

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Silicon is regarded as one of the most promising anode materials for next generation lithium-ion batteries. For use in practical applications, a Si electrode must have high capacity, long cycle life, high efficiency, and the fabrication must be industrially scalable. Here, we design and fabricate a yolk-shell structure to meet all these needs. The fabrication is carried out without special equipment and mostly at room temperature. Commercially available Si nanoparticles are completely sealed inside conformal, thin, self-supporting carbon shells, with rationally designed void space in between the particles and the shell. The well-defined void space allows the Si particles to expand freely without breaking the outer carbon shell, therefore stabilizing the solid-electrolyte interphase on the shell surface. High capacity (similar to 2800 mAh/g at C/10), long cycle life (1000 cycles with 74% capacity retention), and high Coulombic efficiency (99.84%) have been realized in this yolk-shell structured Si electrode.

引用

页码：3315 / 3321

页数：7

共 39 条

[11] Electrospun Core-Shell Fibers for Robust Silicon Nanoparticle-Based Lithium Ion Battery Anodes [J].