Citation: 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 Physico-Chimica Sinica, ;2010, 26(10): 2633-2637. doi: 10.3866/PKU.WHXB20101015 shu

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

1.
College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007, Henan Province, P. R. China

Received Date: 12 February 2010
Available Online: 27 September 2010
Fund Project: 国家自然科学基金(21071046) (21071046)河南省重点科技攻关项目(080102270013)资助 (080102270013)

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.
- Cathode material,
- LiNi_0.5Mn_1.5O₄,
- Lithium ion battery,
- Coprecipitation method,
- Reductiontreatment
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沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Hydrazine on the Performance of LiNi0.5Mn1.5O4Cathode Materials

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