Carbon coated mesoporous Si anode prepared by a partial magnesiothermic reduction for lithium-ion batteries

Owing to its high theoretical capacity, Si based anode materials have been regarded as the most promising alternative anode materials for lithium-ion batteries. Unfortunately, the commercial application of Si based anode materials has been greatly hindered, due to the large volume change of Si mater...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-09, Vol.716, p.204-209
Main Authors: Wu, Lili, Zhou, Haochen, Yang, Juan, Zhou, Xiangyang, Ren, Yongpeng, Nie, Yang, Chen, Song
Format: Article
Language:English
Subjects:
Anodic coatings
Batteries
Carbon coating
Coating effects
Electric contacts
Electrochemical analysis
Electrodes
Lithium-ion batteries
Lithium-ion battery
Mesoporous silicon
Partial magnesiothermic reduction
Rechargeable batteries
Reduction
Silicon
Silicon dioxide
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Summary:Owing to its high theoretical capacity, Si based anode materials have been regarded as the most promising alternative anode materials for lithium-ion batteries. Unfortunately, the commercial application of Si based anode materials has been greatly hindered, due to the large volume change of Si materials during their lithiation/delithiation process, which results in severe pulverization, loss of electrical contact and rapid capacity fading. To address these issues, we reported a partial magnesiothermic reduction method by adjusting the proportion of added Mg powder to convert SiO2 into Si/SiO2 and subsequently to coat such a composite with a carbon layer. After removing unreacted SiO2 using HF, carbon-coated mesoporous Si (p-Si@C) can be obtained. The internal pores could accommodate the volume changes of Si and the carbon coating layer could effectively stabilize the interface during cycling. With this design, the as-prepared p-Si@C shows superior electrochemical performance compared with bare Si. When the p-Si@C electrode evaluated at a rate of 0.5 A g−1, a reversible capacity of 1146 mAh g−1 could still be maintained after 100 cycles. •A Partial Magnesiothermic Reduction Method is used to obtain mesoporous Si.•The internal pores could accommodate the volume changes of Si.•The carbon coating layer could effectively stabilize the interface during cycling.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.05.057