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High power and stable P-doped yolk-shell structured Si@C anode simultaneously enhancing conductivity and Li+ diffusion kinetics

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Chen, Ming, Zhou, Qinnan, Zai, Jiantao, Iqbal, Asma, Tsega, Tsegaye Tadesse, Dong, Boxu, Liu, Xuejiao, Zhang, Yuchi, Yan, Changyu, Zhao, Liang, Nazakat, Ali, Peisan E., Sharel , Low, John C. T. and Qian, Xuefeng (2020) High power and stable P-doped yolk-shell structured Si@C anode simultaneously enhancing conductivity and Li+ diffusion kinetics. Nano Research . doi:10.1007/s12274-020-3142-9 (In Press)

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Official URL: http://dx.doi.org/10.1007/s12274-020-3142-9

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Abstract

Silicon is a low price and high capacity anode material for lithium-ion batteries. The yolk-shell structure can effectively accommodate Si expansion to improve stability. However, the limited rate performance of Si anodes can’t meet people’s growing demand for high power density. Herein, the phosphorus-doped yolk-shell Si@C materials (P-doped Si@C) were prepared through carbon coating on P-doped Si/SiOx matrix to obtain high power and stable devices. Therefore, the as-prepared P-doped Si@C electrodes delivered a rapid increase in Coulombic efficiency from 74.4% to 99.6% after only 6 cycles, high capacity retention of ∼ 95% over 800 cycles at 4 A·g−1, and great rate capability (510 mAh·g−1 at 35 A·g−1). As a result, P-doped Si@C anodes paired with commercial activated carbon and LiFePO4 cathode to assemble lithium-ion capacitor (high power density of ∼ 61,080 W·kg−1 at 20 A·g−1) and lithium-ion full cell (good rate performance with 68.3 mAh·g−1 at 5 C), respectively. This work can provide an effective way to further improve power density and stability for energy storage devices.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Lithium ion batteries, Silicon , Energy storage, Diffusion
Journal or Publication Title: Nano Research
Publisher: Tsinghua University Press
ISSN: 1998-0124
Official Date: 2020
Dates:
DateEvent
2020Published
23 October 2020Available
23 September 2020Accepted
Date of first compliant deposit: 28 October 2020
DOI: 10.1007/s12274-020-3142-9
Status: Peer Reviewed
Publication Status: In Press
Access rights to Published version: Open Access
Copyright Holders: © The Author(s) 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
20520710400Science and Technology Commission of Shanghai Municipalityhttp://dx.doi.org/10.13039/501100003399
18230743400 Science and Technology Commission of Shanghai Municipalityhttp://dx.doi.org/10.13039/501100003399
18QA1402400Science and Technology Commission of Shanghai Municipalityhttp://dx.doi.org/10.13039/501100003399
21771124[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
SL2020MS020)Shanghai Jiao Tong Universityhttp://dx.doi.org/10.13039/501100004921
Joint Seed Fund (2019/20)Shanghai Jiao Tong Universityhttp://dx.doi.org/10.13039/501100004921
Joint Seed Fund (2019/20)University of Warwickhttp://dx.doi.org/10.13039/501100000741

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