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Acta Physico-Chimica Sinica  2007, Vol. 23 Issue (08): 1265-1268    DOI: 10.3866/PKU.WHXB20070824
Note     
Drawing and Application of Phase Diagram Related to Eutectic Mixed Lithium Salts
TANG Hong-Wei; ZHU Zhi-Hong; CHANG Zhao-Rong; CHEN Zhong-Jun
College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007, Henan Province, P. R. China; College of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100080, P. R. China
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Abstract  Eutectic mixed lithium salts were studied with thermal analysis method. The cooling curves and T-x phase diagrams of lithium salts were plotted in this article. The result showed that these binary systems were simple eutectic systems and had the lowest melt points. The lowest melt points of the eutectic mixed LiOH-LiNO3, LiOH-LiCl, LiOH-Li2CO3, and LiNO3-LiCl were 175.7, 294.5, 418.2, and 221.6 ℃, respectively. Eutectic mixture of LiNO3-LiOH was used as lithium salt with different precursors to prepare cathode materials LiNiO2, LiNi0.8Co0.2O2, and LiNi1/3Co1/3Mn1/3O2 for lithium ion battery. XRD results showed that the prepared cathode materials possessed an ordered NaFeO2 layer structure. The intensity ratios of XRD lines I(003)/I(104) of the prepared cathode materials were all greater than 2.0, which means the samples had a better-developed layer structure. Electrochemical property tests testified that for charge-discharge current density of 0.1C and voltage of 2.7-4.3 V(vs Li/Li+), the initial charge specific capacities of prepared LiNiO2, LiNi0.8Co0.2O2, and LiNi1/3Co1/3Mn1/3O2 were 168.0, 225.4, and 194.0 mAh·g-1, and the discharge specific capacities were 138.4, 165.8, and 157.7 mAh·g-1, respectively. Therefore it was a novel and efficient approach that eutectic mixed salts were used to prepare the cathode materials for lithiumion battery.

Key wordsCooling curve      Phase diagram      Eutectic mixed salt      Lithiumion battery     
Received: 30 January 2007      Published: 13 June 2007
MSC2000:  O642  
Corresponding Authors: CHANG Zhao-Rong     E-mail: changzhaorong@263.net
Cite this article:

TANG Hong-Wei; ZHU Zhi-Hong; CHANG Zhao-Rong; CHEN Zhong-Jun. Drawing and Application of Phase Diagram Related to Eutectic Mixed Lithium Salts. Acta Physico-Chimica Sinica, 2007, 23(08): 1265-1268.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20070824     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2007/V23/I08/1265

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