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Rheological phase reaction method synthesis and characterizations of xLiMn0.5Fe0.5PO4–yLi3V2(PO4)3/C composites as cathode materials for lithium ion batteries

Published online by Cambridge University Press:  28 November 2019

Xiaofang Yu ,
Qingwen Li ,
Qian Liu ,
Xuefeng Lei ,
Dawei Song ,
Hongzhou Zhang ,
Xixi Shi  and
Lianqi Zhang
Xiaofang Yu
Affiliation:
School of Materials Science and Engineering, Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin University of Technology, Tianjin 300384, China
Qingwen Li
Affiliation:
School of Materials Science and Engineering, Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin University of Technology, Tianjin 300384, China
Qian Liu
Affiliation:
School of Materials Science and Engineering, Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin University of Technology, Tianjin 300384, China
Xuefeng Lei
Affiliation:
School of Material Science & Food Engineering, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China
Dawei Song
Affiliation:
School of Materials Science and Engineering, Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin University of Technology, Tianjin 300384, China
Hongzhou Zhang*
Affiliation:
School of Materials Science and Engineering, Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin University of Technology, Tianjin 300384, China
Xixi Shi*
Affiliation:
School of Materials Science and Engineering, Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin University of Technology, Tianjin 300384, China
Lianqi Zhang*
Affiliation:
School of Materials Science and Engineering, Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin University of Technology, Tianjin 300384, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

A series of xLiMn0.5Fe0.5PO4–yLi3V2(PO4)3/C (x:y= 4:1, 3:1, 2:1, 1:1, 1:2, and 1:3) composite cathode materials for lithium-ion batteries are successfully prepared by the rheological phase reaction method. The structures, morphologies, and electrochemical properties of these composite materials are studied. The results indicate that xLiMn0.5Fe0.5PO4–yLi3V2(PO4)3/C composites are composed of LiMn0.5Fe0.5PO4 and Li3V2(PO4)3 phases and mutual doping exists. The initial discharge capacities, initial Coulombic efficiencies, and capacity retentions of composites increase but then decline with the increase of Li3V2(PO4)3 content. All the composites show higher capacity retentions than LiMn0.5Fe0.5PO4/C and Li3V2(PO4)3/C single phases except LMFP–3LVP/C. The composite material of x:y= 1:1 exhibits remarkably superior electrochemical performance than the single phases and other composites both in discharge capacity and cycle performance, delivering the initial discharge capacity of 148.2 mA h/g (2.0–4.5 V) and 170.1 mA h/g (2.0–4.8 V) at 0.1 C. And the corresponding capacity retentions are 98.0 and 90.4% after 100 cycles, respectively.

Keywords

compositeenergy storagepowder
Type
Invited Paper
Information
Journal of Materials Research , Volume 35 , Issue 1: Focus Section: Advances in Battery Technology: Material Innovations in Design and Fabrication , 14 January 2020 , pp. 2 - 11
Copyright
Copyright © Materials Research Society 2019 

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