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In situ low-temperature hydrothermal synthesis of LiMn2O4 nanocomposites based on graphene oxide/carbon nanotubes hydrogel and its capacities

Published online by Cambridge University Press:  17 July 2020

Kelei Wang ,
Lei Hua ,
Zhongbing Wang ,
Guanping Jin  and
Chunnian Chen Open the ORCID record for Chunnian Chen [Opens in a new window]
Kelei Wang
Affiliation:
Anhui Province Key Laboratory of Advance Catalytic Material and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei230009, PR China
Lei Hua
Affiliation:
Anhui Province Key Laboratory of Advance Catalytic Material and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei230009, PR China
Zhongbing Wang
Affiliation:
Anhui Province Key Laboratory of Advance Catalytic Material and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei230009, PR China
Guanping Jin*
Affiliation:
Anhui Province Key Laboratory of Advance Catalytic Material and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei230009, PR China
Chunnian Chen*
Affiliation:
Anhui Province Key Laboratory of Advance Catalytic Material and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei230009, PR China
*
b)e-mail: jgp@hfut.edu.cn
a)Address all correspondence to these authors. e-mail: chencn@hfut.edu.cn
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Abstract

Integrating LiMn2O4(LMO) and different carbon materials to build a mixed cathode system can provide fast transport channels to improve the conduction of both electrons and ions. In this paper, our work studied in situ low-temperature hydrothermal synthesis of LMO nanocomposites based on graphene oxide (GO)/carbon nanotubes (CNTs) hydrogel. Compared with the pure LMO nanoparticles, GO/CNTs/LMO (GCLMO) composites greatly improved electrochemical performance in specific capacity, cycle performance and rate ability. The electrochemical test results showed that the specific capacitance of GCLMO nanocomposites reached 396 F/g at the current density of 0.5 A/g, which was much higher than 221 F/g of pure LMO. Even at the current density of 10 A/g, the specific capacitance was still as high as 309 F/g. Besides, after 2000 cycles, the specific capacitance retention of the composite was 93%. Electrochemical data showed that GCLMO composite is an ideal cathode material for supercapacitors.

Keywords

LiMn2O4carbon nanotubesgraphene oxidehydrogelnanocomposite

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Article
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Journal of Materials Research , Volume 35 , Issue 18 , 28 September 2020 , pp. 2516 - 2527
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Copyright © Materials Research Society 2020

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