High rate capability of coconut kernel derived carbon as an anode material for lithium-ion batteries
1Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
2Energy Storage and System Initiative Center, Indian Institute of Science, Bangalore 560012, India
Adv. Mater. Lett., 2014, 5 (4), pp 184-190
Publication Date (Web): Feb 16, 2014
Copyright © IAAM-VBRI Press
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.
Coconut kernel carbon, Li-ion cells, charge-discharge cycling, high rate capability.