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Nano Research 2021, 14(4): 1004-1011 https://doi.org/10.1007/s12274-020-3142-9
Research Article | Open Access | Issue | Published: 23 October 2020

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

Show Author's Information Ming Chen1,  Qinnan Zhou1,  Jiantao Zai1( ),  Asma Iqbal1,  TsegayeTadesse Tsega1,  Boxu Dong1,  Xuejiao Liu1,  Yuchi Zhang1,  Changyu Yan1,  Liang Zhao1,  Ali Nazakat1,  SharelPeisan E2,3,  CheeTongJohn Low2( ),  Xuefeng Qian1( )
Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Warwick Electrochemical Engineering Group, WMG, Energy Innovation Centre, University of Warwick, CV4 7AL, UK
School of Health & Life Sciences, Teesside University, Middlesbrough, TS1 3BX, UK
Keywords:
lithium-ion battery, full cell, P-doped yolk-shell structured Si@C anode, excellent rate performance, long life, high power
Topics:
AnodesEnergy storageIon batteriesIonsIron compoundsLithiumLithium compoundsPhosphorusSiliconSilicon compounds
Cite this article:
Chen M, Zhou Q, Zai J, et al. High power and stable P-doped yolk-shell structured Si@C anode simultaneously enhancing conductivity and Li+ diffusion kinetics. Nano Research, 2021, 14(4): 1004-1011. https://doi.org/10.1007/s12274-020-3142-9
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Abstract Full text Electronic supplementary material About this article

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.


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About this article

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

Show Author's information Ming Chen1, Qinnan Zhou1, Jiantao Zai1( ), Asma Iqbal1, TsegayeTadesse Tsega1, Boxu Dong1, Xuejiao Liu1, Yuchi Zhang1, Changyu Yan1, Liang Zhao1, Ali Nazakat1, SharelPeisan E2,3, CheeTongJohn Low2( ), Xuefeng Qian1( )
Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Warwick Electrochemical Engineering Group, WMG, Energy Innovation Centre, University of Warwick, CV4 7AL, UK
School of Health & Life Sciences, Teesside University, Middlesbrough, TS1 3BX, UK

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.

Keywords: lithium-ion battery, full cell, P-doped yolk-shell structured Si@C anode, excellent rate performance, long life, high power

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Received: 13 August 2020
Revised: 21 September 2020
Accepted: 23 September 2020
Published: 23 October 2020
Issue date: April 2021

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© The Author(s) 2020

Acknowledgements

The work is supported by Science and Technology Commission of Shanghai Municipality (Nos. 20520710400, 18230743400 and 18QA1402400), the National Natural Science Foundation of China (No. 21771124), Oceanic Interdisciplinary Program of Shanghai Jiao Tong University (No. SL2020MS020), and SJTU-Warwick Joint Seed Fund (2019/20).

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