High performance porous Si@C anodes synthesized by low temperature aluminothermic reaction

Journal Article · Sun Apr 01 04:00:00 EDT 2018 · Electrochimica Acta

DOI:https://doi.org/10.1016/j.electacta.2018.02.166· OSTI ID:1439006

Mishra, Kuber; Zheng, Jianming; Patel, Rajankumar; Estevez, Luis; Jia, Haiping; Luo, Langli; El-Khoury, Patrick Z.; Li, Xiaolin; Zhou, Xiao-Dong; Zhang, Ji-Guang

A low temperature (210°C) aluminothermic reduction reaction process has been developed to synthesis porous silicon (Si) as an anode for Li ion battery applications. An eutectic mixture of AlCl3 and ZnCl2 is used as the mediator to reduce the reaction temperature. With carbon pre-coated on the porous SiO2 precursor, porous Si@C core shell structured anodes could be obtained with structure and morphology similar to that of the porous precursor. In addition, carbon coated porous Si also exhibits superior cyclic stability, higher rate performance, and higher coulombic efficiency. The porous Si anode demonstrates a high specific capacity of ~2100 mAh/g at the current density of 1.2 A/g and has a good cycling stability with ~76% capacity retention over 250 cycles. Therefore, it will be a good candidate for anode used in high energy density Li-ion batteries.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1439006
• Report Number(s): PNNL-SA-130364; 49321; VT1201000
• Journal Information: Electrochimica Acta, Journal Name: Electrochimica Acta Journal Issue: C Vol. 269; ISSN 0013-4686
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

Environmental Molecular Sciences Laboratory
aluminothermic reaction
anode
porous Si
silicon