Lithium-ion battery which widely used as portable power sources with high energy density is greatly being increased due to the development and popularity of portable electronic device and vehicle. Lithium nickel oxide (LiNiO2) and their derivatives are promising positive cathode materials for next generation of lithium-ion batteries. LiNiO2 potentially offers a higher capacity at about 200 mAh/g. However it is more difficult to synthesized stoichiometric LiNiO2 because of the loss of lithium from host structure during high temperature calcination due the high vapor pressure of lithium and capacity fade when charging up to a high voltage (> 4.0V vs Li+/Li) during deintercalation of lithium ion that affected cycling. The review is focused the electrochemical performance by substitution or effect doping of LiNiO2 and their derivative by other metals as a cathode materials for lithium ion batteries.
Lithium nickel cobalt oxide materials doped with Al, Mg, and Fe were synthesized by solid-state reaction at 800°C for 18 h to study the effects of adding transition and nontransition metals to the structure. Crystalline compounds were obtained as revealed by powder X-ray diffraction (XRD). Energy dispersive analysis of X-rays (EDAX) was used to determine the elemental ratio of all the samples. Impedance measurements showed that all samples have decreasing conductivities at higher temperatures and gave negative activation energies. The addition of nontransition metals actually decreased the conductivities of the materials.
Abstract. Lithium nickel oxide cathodes doped with Fe and Mg was synthesized by the solid state reaction method at 800 ~ Structural investigation of these materials was performed using XRD and EDAX. The electrochemical behavior was studied using galvanostatic charge/discharge in order to investigate the performance of LiNio6Feo3MgojO 2, LiNio6Feoz5Mgo~502 and LiNi 06Feo 2Mgo 202 materials. It is shown that LiNi o 6Feo 3Mgo 102 produced about 96 m Ah/g of discharge capacity.
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