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Current Nanoscience

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ISSN (Print): 1573-4137
ISSN (Online): 1875-6786

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Research Article

Enhancing the Li+ Diffusion in Li3VO4 by Coupling with Reduced Graphene Oxide for Lithium-Ion Batteries

Author(s): Mingxuan Guo and Haibo Li*

Volume 18, Issue 1, 2022

Published on: 02 February, 2021

Page: [61 - 67] Pages: 7

DOI: 10.2174/1573413717666210202115508

Price: $65

Abstract

Background: Owing to the excellent theoretical specific capacity and safety intercalation potential, Li3VO4 (LVO) has been proposed as an advanced anode material for lithium ions batteries (LIBs). However, the LVO suffers from low electronic conductivity that limits its commercialization.

Objective: The reduced graphene oxide (rGO) is recommended to couple with micro-LVO particles aiming to enhance the conductivity of composite electrodes.

Method: The LVO@rGO composite is synthesized by a facile hydrothermal method. The morphology, crystallinity, valance state and electrochemical behavior of LVO@rGO are characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and electrochemical workstation, respectively. Further, the LIBs’ performance is explored by making a coins-type half-cell LIBs battery via battery system.

Results: The Li+ diffusion rate of the optimized LVO@rGO electrode is 7.67×10-23 cm2/s, which improves two orders of magnitudes of pure LVO electrode. As a result, the LVO@rGO anode delivers a reversible capacity of 190.1 mAh/g at 0.1 A/g after 100 cycles, which is even twice higher than that of pure LVO anode (90.6 mAh/g). Besides, it exhibits superior rate capability, i.e. a reversible capability of 285.0, 220.2, 158.7, 105.2 and 71.7 mAh/g at 0.05, 0.1, 0.2, 0.5 and 1.0 A/g, respectively.

Conclusion: The high conductivity and flexible texture enable rGO an idea building block to enhance the Li ion diffusion of whole electrode. On the other hand, it is instrumental in alleviating the aggregation of host materials, leading to high specific surface and specific capacity.

Keywords: Lithium-ion battery, Li3VO4, graphene, Li ion diffusion, hydrothermal, electrochemistry

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