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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 3    June 2009

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Synthesis of LiNi1/3Co1/3Mn1/3O2 cathode material via oxalate precursor
ZHANG Chuan-fu(张传福), YANG Ping(杨 平), DAI Xi(戴 曦),
XIONG Xuan(熊 宣), ZHAN Jing(湛 菁), ZHANG Yin-liang(张银亮)

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:Using oxalic acid and stoichiometrically mixed solution of NiCl2, CoCl2, and MnCl2 as starting materials, the triple oxalate precursor of nickel, cobalt, and manganese was synthesized by liquid-phase co-precipitation method. And then the LiNi1/3Co1/3Mn1/3O2 cathode materials for Li-ion battery were prepared from the precursor and LiOH∙H2O by solid-state reaction. The precursor and LiNi1/3Co1/3Mn1/3O2 were characterized by chemical analysis, XRD, EDX, SEM and TG-DTA. The results show that the composition of precursor is Ni1/3Co1/3Mn1/3C2O4•2H2O. The product LiNi1/3Co1/3Mn1/3O2, in which nickel, cobalt and manganese are uniformly distributed, is well crystallized with a-NaFeO2 layered structure. Sintering temperature has a remarkable influence on the electrochemical performance of obtained samples. LiNi1/3Co1/3Mn1/3O2 synthesized at 900 ℃ has the best electrochemical properties. At 0.1C rate, its first specific discharge capacity is 159.7 mA∙h/g in the voltage range of 2.75−4.30 V and 196.9 mA∙h/g in the voltage range of 2.75−4.50 V; at 2C rate, its specific discharge capacity is 121.8 mA∙h/g and still 119.7 mA∙h/g after 40 cycles. The capacity retention ratio is 98.27%.

 

Key words: Li-ion batteries; cathode materials; LiNi1/3Co1/3Mn1/3O2; electrochemical performance

ISSN 1672-7029
CN 43-1423/U

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