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Acta Physico-Chimica Sinica  2010, Vol. 26 Issue (10): 2633-2637    DOI: 10.3866/PKU.WHXB20101015
ELECTROCHEMISTRY     
Effect of Hydrazine on the Performance of LiNi0.5Mn1.5O4Cathode Materials
CHANG Zhao-Rong, DAI Dong-Mei, LI Bao, TANG Hong-Wei
College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007, Henan Province, P. R. China
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Abstract  
Reduction pretreatment of the precursor of LiNi0.5Mn1.5O4 was carried out by adding hydrazine to a solution of NaOH during precursor synthesis. Accordingly, the effect of hydrazine on the performance of LiNi0.5Mn1.5O4 was studied by comparing the electrochemical properties of this sample with those of pristine samples (LiNi0.5Mn1.5O4 without hydrazine pretreatment). We synthesized LiNi0.5Mn1.5O4 by co-precipitation using a two-step drying method with NiSO4 and MnSO4 as raw materials. The results of electrochemical experiments show that the LiNi0.5Mn1.5O4 from the hydrazine pretreated precursor has a much higher special capacity than the pristine sample at the same charge/ discharge current density. Moreover, the former shows much better electrochemical performance at a high discharge current density. Results of powder X-ray diffraction (XRD) reveal that the LiNi0.5Mn1.5O4 from the hydrazine pretreated precursor shows a pure spinel phase (no impurity phase detected) while the pristine sample containsa minor impurity phase. Results of scanning electron microscopy (SEM) show that the crystal impurities have a layered structure and are mixed with octahedral crystals of LiNi0.5Mn1.5O4. We show that the impurity in the precursor is insoluble Na0.55Mn2O4·1.5H2O, which derives from the oxidation of Mn(OH)2 by O2 and a final transformation into Na0.7MnO2.05.

 



Key wordsCathode material      LiNi0.5Mn1.5O4      Lithium ion battery      Coprecipitation method      Reductiontreatment     
Received: 12 February 2010      Published: 27 September 2010
MSC2000:  O646  
Fund:  

The project was supported by the National Natural Science Foundation of China (21071046) and Henan Key Scientific and Technological Project, China (080102270013).

Corresponding Authors: CHANG Zhao-Rong     E-mail: czr_56@163.com
Cite this article:

CHANG Zhao-Rong, DAI Dong-Mei, LI Bao, TANG Hong-Wei. Effect of Hydrazine on the Performance of LiNi0.5Mn1.5O4Cathode Materials. Acta Physico-Chimica Sinica, 2010, 26(10): 2633-2637.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20101015     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2010/V26/I10/2633

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