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research-article

Effect of niobium doping on electrochemical properties of microwave synthesized carbon coated nano lithium iron phosphate for high rate underwater applications

[+] Author and Article Information
Adapaka Srinivas Kumar

Naval Science and Technological Laboratory, Vigyan Nagar, Visakhapatnam-530027, India
adapakaeskay@yahoo.com

T.V.S.L Satyavani

Naval Science and Technological Laboratory, Vigyan Nagar, Visakhapatnam-530027, India
tvslsatyavani@gmail.com

Senthilkumar Mathiyazhagan

Naval Science and Technological Laboratory, Vigyan Nagar, Visakhapatnam-530027, India
senthizhan@gmail.com

P.S.V Subba Rao

Department of Physics, Andhra University, Visakhapatnam-530003, India
raopsvs@rediffmail.com

1Corresponding author.

ASME doi:10.1115/1.4041454 History: Received June 19, 2018; Revised September 04, 2018

Abstract

Lithium Iron Phosphate (LiFePO4) for lithium-ion batteries is considered as perfect cathode material for various military applications, especially underwater combat vehicles. For deployment at high rate applications, conductivity of LiFePO4 needs be improved. In the present work, the niobium doped solid solution could be formed is studied for conductivity improvement. Nano powders of LiFePO4/C and Li1-xNbxFePO4/C (x=0.05, 0.1, 0.15, 0.16) synthesized from precursors using microwave synthesis. The solid solution formation up to (x=0.15) Li1-xNbxFePO4/C without impurity phases is confirmed by XRD and FTIR results. Particle distribution is obtained by SEM . CR2032 type coin cells were fabricated with the synthesized materials and subjected to cyclic voltammetry studies, rate capability & cycle life studies. Diffusion coefficients and dc conductivity improved by niobium doping. Cells with Li0.9Nb0.1FePO4/C are able to deliver useful capacity of around 104 mAh/g at 10C rate. More than 500 cycles could be are achieved with Li0.9Nb0.1FePO4/C at 20C rate.

Copyright (c) 2018 by ASME
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