Conductive Rigid Skeleton Supported Silicon as High-Performance Li-Ion Battery Anodes

被引：164

作者：

Chen, Xilin ^{[1
]}

Li, Xiaolin ^{[1
]}

Ding, Fei ^{[1
,2
]}

Xu, Wu ^{[1
]}

Xiao, Jie ^{[1
]}

Cao, Yuliang ^{[1
,3
]}

Meduri, Praveen ^{[1
]}

Liu, Jun ^{[1
]}

Graff, Gordon L. ^{[1
]}

Zhang, Ji-Guang ^{[1
]}

机构：

[1] Pacific NW Natl Lab, Richland, WA 99354 USA

[2] Tianjin Inst Power Sources, Natl Key Lab Power Sources, Tianjin 300381, Peoples R China

[3] Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China

来源：

NANO LETTERS | 2012年 / 12卷 / 08期

关键词：

Silicon; anode; rigid skeleton; core-shell structure; lithium-ion batteries; energy storage; boron carbide; HIGH-CAPACITY; GRAPHITE COMPOSITES; LITHIUM; ELECTRODES; REDUCTION; NANOWIRES;

D O I：

10.1021/nl301657y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A cost-effective and scalable method is developed to prepare a core shell structured Si/B4C composite with graphite coating with high efficiency, exceptional rate performance, and long-term stability. In this material, conductive B4C with a high Mohs hardness serves not only as micro/nano-millers in the ball-milling process to break down micron-sized Si but also as the conductive rigid skeleton to support the in situ formed sub-10 nm Si particles to alleviate the volume expansion during charge/discharge. The Si/B4C composite is coated with a few graphitic layers to further improve the conductivity and stability of the composite. The Si/B4C/graphite (SBG) composite anode shows excellent cyclability with a specific capacity of similar to 822 mAh.g(-1) (based on the weight of the entire electrode, including binder and conductive carbon) and similar to 94% capacity retention over 100 cycles at 0.3 C rate. This new structure has the potential to provide adequate storage capacity and stability for practical applications and a good opportunity for large-scale manufacturing using commercially available materials and technologies.

引用

页码：4124 / 4130

页数：7

共 36 条

[1] ALL-SOLID LITHIUM ELECTRODES WITH MIXED-CONDUCTOR MATRIX [J].