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Undoubtedly, it is imperative to figure out two stubborn issues concerning low electronic conductivity and sluggish lithium ion diffusion to promote the practical application of Li2FeSiO4 materials in lithium-ion battery (LIB) cathode. Herein, we report an innovative and simple strategy that combines a hydrothermal process with subsequent annealing to synthesize highly uniform Li2FeSiO4/C hollow nanospheres. During the hydrothermal process, polystyrene nanospheres are employed not only as the template but also, more tactfully, as carbon source to form amorphous carbon layers, which will function to enhance the electronic conductivity and restrict particle aggregations. The use of the LIB Li2FeSiO4/C hollow nanospheres as a LIB cathode delivers a desired stable capacity at each rate stage, and even at a high rate of 10 C, the hollow nanosphere cathode can present a specific discharge capacity as high as 50.5 mAh·g-1. After 100 cycles, the capacity retentions at 1 and 10 C remain as high as 93% and 72%, respectively. The superior electrochemical performance is believed to be related to special architectures of the Li2FeSiO4/C hollow nanosphere cathode.


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Li2FeSiO4/C hollow nanospheres as cathode materials for lithium-ion batteries

Show Author's information Shuiyun Shen1Yao Zhang1Guanghua Wei2Wansen Zhang1Xiaohui Yan1Guofeng Xia1Aiming Wu1Changchun Ke1Junliang Zhang1( )
Institute of Fuel Cells,School of Mechanical Engineering, Shanghai Jiao Tong University,Shanghai,200240,China;
SJTU-Paris Tech Elite Institute of Technology,Shanghai Jiao Tong University,Shanghai,200240,China;

Abstract

Undoubtedly, it is imperative to figure out two stubborn issues concerning low electronic conductivity and sluggish lithium ion diffusion to promote the practical application of Li2FeSiO4 materials in lithium-ion battery (LIB) cathode. Herein, we report an innovative and simple strategy that combines a hydrothermal process with subsequent annealing to synthesize highly uniform Li2FeSiO4/C hollow nanospheres. During the hydrothermal process, polystyrene nanospheres are employed not only as the template but also, more tactfully, as carbon source to form amorphous carbon layers, which will function to enhance the electronic conductivity and restrict particle aggregations. The use of the LIB Li2FeSiO4/C hollow nanospheres as a LIB cathode delivers a desired stable capacity at each rate stage, and even at a high rate of 10 C, the hollow nanosphere cathode can present a specific discharge capacity as high as 50.5 mAh·g-1. After 100 cycles, the capacity retentions at 1 and 10 C remain as high as 93% and 72%, respectively. The superior electrochemical performance is believed to be related to special architectures of the Li2FeSiO4/C hollow nanosphere cathode.

Keywords: lithium-ion batteries, cathode, Li2FeSiO4/C, hollow nanospheres, high performance

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Acknowledgements

Publication history

Received: 20 June 2018
Revised: 12 October 2018
Accepted: 13 October 2018
Published: 09 November 2018
Issue date: February 2019

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© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Acknowledgements

Acknowledgements

We gratefully acknowledge the financial support from the National Natural Science Foundation of China (Nos. 21503134 and 21406220), the Science Foundation of Ministry of Education of China (No. 413064); PSA Peugeot Citroën (No.13H100000584); Shanghai Jiao Tong University New Faculty Startup Funds (No.14X10040061); and the Science and Technology Commission of Shanghai Municipality (No.15YF1406500).

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