Interpenetrated 3D porous silicon as high stable anode material for Li-Ion battery

• Published in: Journal of power sources Vol. 406; pp. 167 - 175
• Main Authors: Liu, Yanxia, Qin, Lijuan, Liu, Fan, Fan, Yameng, Ruan, Jingjing, Zhang, Suojiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2018
• Subjects: Bi-continues structure; Composite gel; Lithium-ion batteries; Magnesiothermic reduction; Silicon-based anode; Template-free method; Lithium-ion batteries; Template-free method; Composite gel; Bi-continues structure; Silicon-based anode; Magnesiothermic reduction
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2018.10.028

Confronting issues of silicon-based anode for its huge volume change (∼320%), porous silicon attracts noteworthy attention. Most previous studies are concentrated on designing various sacrificial templates to endow silicon with marvelous shapes or structures. Herein, without the assistance of sacrificial template, a template-free method is developed to fabricate interpenetrated three-dimensional porous silicon. A silica composite gel, which possesses numerous nano-pores, is primarily constructed, and the silicon can be inherently equipped with these nano-pores via modified magnesiothermic reduction. Scanning electron microscope and transmission electron microscope images illustrate that the as-prepared porous silicon possesses bi-continuous structure. It also exhibits high initial reversible capacity (∼1.41 mAh cm−2 at 0.16 mA cm−2), superior cycling stability (∼0.98 mAh cm−2 after 200 cycles), and good rate performance. In addition, analysis of cyclic voltammetry curves and electrochemical impedance spectroscopy demonstrate that this porous silicon possesses appropriate channels for rapid Li+ transport and low electrochemical reaction polarization resistance. [Display omitted] •A template-free method is utilized to fabricate interpenetrated porous silicon.•The porous silicon demonstrates good cycling stability and rate capability.•Detailed electrochemical measurements and analysis are also conducted.