水合肼对锂离子正极材料LiNi0.5Mn1.5O4 性能的影响

doi:10.3866/PKU.WHXB20101015

Abstract

Abstract:

Reduction pretreatment of the precursor of LiNi_0.5Mn_1.5O₄ was carried out by adding hydrazine to a solution of NaOH during precursor synthesis. Accordingly, the effect of hydrazine on the performance of LiNi_0.5Mn_1.5O₄ was studied by comparing the electrochemical properties of this sample with those of pristine samples (LiNi_0.5Mn_1.5O₄ without hydrazine pretreatment). We synthesized LiNi_0.5Mn_1.5O₄ by co-precipitation using a two-step drying method with NiSO₄ and MnSO₄ as raw materials. The results of electrochemical experiments show that the LiNi_0.5Mn_1.5O₄ 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 LiNi_0.5Mn_1.5O₄ 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 LiNi_0.5Mn_1.5O₄. We show that the impurity in the precursor is insoluble Na_0.55Mn₂O₄·1.5H₂O, which derives from the oxidation of Mn(OH)₂ by O₂ and a final transformation into Na_0.7MnO_2.05.

Key words: Cathode material, LiNi_0.5Mn_1.5O₄, Lithium ion battery, Coprecipitation method, Reductiontreatment

MSC2000:

O646

CHANG Zhao-Rong, DAI Dong-Mei, LI Bao, TANG Hong-Wei. Effect of Hydrazine on the Performance of LiNi_0.5Mn_1.5O₄Cathode Materials[J].Acta Phys. -Chim. Sin., 2010, 26(10): 2633-2637.

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Effect of Hydrazine on the Performance of LiNi_0.5Mn_1.5O₄Cathode Materials

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Effect of Hydrazine on the Performance of LiNi_0.5Mn_1.5O₄Cathode Materials