水合肼对锂离子正极材料LiNi0.5Mn1.5O4 性能的影响

引用本文: 常照荣, 代冬梅, 李苞, 汤宏伟. 水合肼对锂离子正极材料LiNi_0.5Mn_1.5O₄ 性能的影响[J]. 物理化学学报, 2010, 26(10): 2633-2637. doi: 10.3866/PKU.WHXB20101015 shu

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

水合肼对锂离子正极材料LiNi_0.5Mn_1.5O₄ 性能的影响

基金项目:
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)

摘要:

以NiSO₄ 和MnSO₄ 为原料, 在用共沉淀法经二次干燥制备锂离子电池正极材料LiNi_0.5Mn_1.5O₄ 的前驱体时, 加入水合肼进行还原处理. 实验结果发现: 经还原处理的前驱体制备正极材料LiNi_0.5Mn_1.5O₄ 的充放电比容量远远高于同样条件下不经水合肼还原处理的前驱体制备的正极材料的充放电比容量, 而且处理前驱体制备的正极材料在高倍率放电条件下电化学行为更好. 粉末X 射线衍射(XRD) 和扫描电镜(SEM) 测试结果表明, 用还原剂水合肼处理的前驱体合成的样品为单一的尖晶石结构, 晶粒呈规则的八面体形貌, 没有杂质相, 而未处理前驱体合成的样品则含有少量的杂质相. 这种杂质相是在前驱体的制备过程中由于Mn(OH)₂ 被O₂ 氧化而形成难溶Na_0.55Mn₂O₄·1.5H₂O 化合物, 最终转变为Na_0.7MnO_2.05.

关键词:

English

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)

河南省重点科技攻关项目(080102270013)资助

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:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

水合肼对锂离子正极材料LiNi_0.5Mn_1.5O₄ 性能的影响

English

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

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