High Rate Capability Of Coconut Kernel Derived Carbon As An Anode Material For Lithium-ion Batteries
Tirupathi Rao Penki, D. Shanmughasundaram, Brij Kishore and N. Munichandraiah
Volume 5, Issue 4, Page 184-190 | DOI: 10.5185/amlett.2013.8530
Coconut kernel carbon; Li-ion cells; charge-discharge cycling; high rate capability.
Carbon has been prepared by pyrolysis of grated, milk-extracted coconut kernel at 600 ºC under nitrogen atmosphere. The disordered carbon has sheet like morphology. The carbon exhibits a high reversible Li+ intercalation capacity in a non-aqueous electrolyte. The initial charge and discharge capacities are 990 and 400 mAh g-1, thus resulting in an irreversible capacity loss of 590 mAh g-1. Nevertheless, subsequent discharge capacity is stable over a large number of charge-discharge cycles. The electrodes withstand charge-discharge currents as high as 1257 mA g-1 and they deliver discharge capacity of 80 mAh g-1. Diffusion coefficient of Li+ obtained from galvanostatic intermittent titration is 6.7 x 10-12 cm2 s-1. Thus the coconut kernel derived carbon is a suitable anode material for Li-ion batteries. Copyright © 2014 VBRI press.