Scalable chemical approach to prepare crystalline Mn 2 V 2 O 7 nanoparticles: introducing a new long-term cycling cathod
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Scalable chemical approach to prepare crystalline Mn2V2O7 nanoparticles: introducing a new long-term cycling cathode material for lithium-ion battery L. Shreenivasa1, R. Viswanatha2, Sriram Ganesan3, Yogesh Kalegowda4, Mahaveer D. Kurkuri3, and S. Ashoka1,* 1
Department of Chemistry, School of Engineering, Dayananda Sagar University, Bengaluru, Karnataka, India Department of Chemistry, Jyothy Institute of Technology, Bengaluru, Karnataka, India 3 Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bengaluru, Karnataka 562112, India 4 Department of Physics, School of Engineering, Dayananda Sagar University, Bengaluru, Karnataka, India 2
Received: 18 June 2020
ABSTRACT
Accepted: 11 September 2020
Herein, a new cathode material, Mn2V2O7, for lithium-ion batteries is identified. A simple chemical method is proposed to synthesize newly identified Mn2V2O7 material for large scale production. The synthesis of nanosized manganese vanadate in high yield with improved electrochemical performance toward lithium-ion battery applications is of fundamental and technological advancement. The newly identified Mn2V2O7 holds a large reversible capacity of 242 mAh/g at 0.2 C rate with 82% of capacitance retention after 1442 cycles and thereby makes it suitable for lithium-ion battery fabrication. This long-term cycling is the highest reported for Mn2V2O7 to the best of our knowledge.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction The layered transition metal oxides were considered as promising cathode materials for lithium-ion batteries owing to the lower barrier for Li? ion diffusion, high energy density, and high specific capacity. However, to accelerate the practical use of lithiumion batteries in electric vehicles and hybrid electric vehicles, the electrochemical performance of positive electrode needs to be improved in terms of energy density and power density [1, 2]. Further, the longterm cycling stability and reversible capacity of
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https://doi.org/10.1007/s10854-020-04490-5
positive electrode is still the key issues to realize their practical applications. Vanadium oxide has been considered as a promising cathode material owing to high specific capacity [3, 4]. However, the practical applications of vanadium oxide in the lithium-ion battery have not been realized due to structural degradation upon cycling and sluggish reaction kinetics, which leads to poor stability of the positive electrode for long-term cycling. Numerous efforts have been made in the past to maximize the energy densities and stabilize the structure of vanadium oxide. Tailoring the size/morphology through nanoengineering and
J Mater Sci: Mater Electron
doping has been extensively investigated [5–11]. Further, various metal ions have also been introduced in between vanadium oxide layers and then investigated as cathode materials [12–16]. Among the vanadiumbased binary metal oxides, Mn–V–O system has not been investigated as a cathode
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