Authors: Miao Shui Shan Gao Jie Shu Weidong Zheng Dan Xu Liangliang Chen Lin Feng Yuanlong Ren
Publish Date: 2012/05/06
Volume: 19, Issue: 1, Pages: 41-46
Abstract
Layered lithium ion battery cathode material LiNi1/3Co1/3Mn1/3O2 with uniform particle size of about 6 μm was synthesized by a spray pyrolysis method Infrared and Xray diffraction analyses show that the pyrolysis at 1000 °C for 2 s in the tube furnace eliminates nearly all the organic components but is still not enough for the complete crystallization of LiNi1/3Co1/3Mn1/3O2 materials Therefore further annealing at 850 °C is needed The prepared LiNi1/3Co1/3Mn1/3O2 cathode materials show excellent electrochemical performances By increasing the Crates the cell shows discharge capacities of 1593 1482 1337 and 1257 mAh g−1 at 01 02 05 and 1C rates respectively Only 21 mAh g−1 capacity loss is observed when back to 01C rate Moreover LiNi1/3Co1/3Mn1/3O2 cathode retains 96 977 971 945 and 971 of its initial discharge capacities after 20 cycles at 01 02 05 1 and back to 01C rates respectively More than 97 coulombic efficiencies are observed at all the current densities in 20 cyclesWe gratefully acknowledge the support for this work from 973 Fundamental Research Program from the Ministry of Science and Technology of China grant number 2010CB635116 NSFC project 21173190 Educational Commission of Zhejiang Province grant number Y201017390 Ningbo Science Technology Bureau Project 2011A610086 and KC Wong Magna Fund in Ningbo University
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