Electrochemical Properties of Al Doped Li(Ni1/3Co1/3Mn1/3)O2

Seon Hye Kim; Kwang Bo Shim; Kyoung Ran Han; Chang Sam Kim

doi:10.4028/www.scientific.net/SSP.124-126.1023

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Electrochemical Properties of Al Doped Li(Ni_1/3Co_1/3Mn_1/3)O₂

Abstract:

Al doped Li(Ni1/3Co1/3Mn1/3-xAlx)O2 (x=0.005, 0.01, 0.05) and Li(Ni1/3-x/2Co1/3Mn1/3-x/2Alx)O2 (x=0.01, 0.05) cathode materials for lithium ion batteries were synthesized using an ultrasonic spray pyrolysis and heat treatment. The substitution with Al reduced the content of Mn3+, promoted grain growth, and broadened the particle size distribution of synthesized powders. The initial discharge capacity of cells made with 0.5 mol% Al doped Li(Ni1/3Co1/3Mn1/3-0.005Al0.005)O2 powder was as high as that of the undoped (~180 mAhg-1, 3.04.5 V), and showed an excellent cycle stability. The improvement of the cycle stability was considered to be due to the decrease of Mn3+ in Li(Co1/3Ni1/3Mn1/3-xAlx)O2 by Al doping.