Facile fabrication of Si mesoporous nanowires for high-capacity and long-life lithium storage.
Si has the second highest theoretical capacity among all the known anode materials for lithium ion batteries, whereas it is vulnerable to pulverization and crumbling upon lithiation/delithiation. Herein, Si mesoporous nanowires prepared by a scalable and cost-effective procedure are reported for the first time. Such nanowire morphology and mesoporous structure can effectively buffer the huge lithiation-induced volume expansion of Si, therefore contributing to excellent cycling stability and high-rate capability. Reversible capacities of 1826.8 and 737.4 mA h g(-1) can be obtained at 500 mA g(-1) and a very high current density of 10 A g(-1), respectively. After 1000 cycles at 2500 mA g(-1), this product still maintains a high capacity of 643.5 mA h g(-1).
School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai 20024, P.R. China. liyangce@sjtu.edu.cn.
Jizhang
J
Chen
Li
L
Yang
Saibihai
S
Rousidan
Shaohua
S
Fang
Zhengxi
Z
Zhang
Shin-ichi
S
Hirano
D011211:Electric Power Supplies; D055664:Electrochemical Techniques; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D016062:Porosity; D011758:Pyrroles / Q000737:chemistry
D007477:Ions; D011108:Polymers; D011758:Pyrroles; C067635:polypyrrole; D008094:Lithium