Mn掺杂Ni(OH)2的合成及电化学性能研究

doi:10.15541/jim20180449

摘要/Abstract

摘要：

本工作采用缓冲溶液法制备Mn掺杂Ni(OH)₂(Ni_1-_xMn_x(OH)₂, x=0.1, 0.2, 0.3, 0.4), X射线衍射测试表明样品主要是β相, 有少量Mn₃O₄杂相; 循环伏安测试表明, x=0.2的材料还原峰积分面积最大、还原分支的峰电流最高; 恒流充放电测试表明, 在100 mA/g电流密度下, Ni_0.8Mn_0.2(OH)₂放电比容量最高, 其第20次循环放电比容量为271.8 mAh/g, 同等条件测试的商用β-Ni(OH)₂放电比容量为253.6 mAh/g; 在300、500 mA/g电流密度下, Ni_0.8Mn_0.2(OH)₂放电比容量仍保持最高, 分别为294.7、291.5 mAh/g, 而且Mn掺杂Ni(OH)₂的循环稳定性也优于商用β-Ni(OH)₂。Mn掺杂可改善镍电极的循环稳定性、降低镍电极成本, 具有广阔的应用前景。

关键词: 缓冲溶液法, Mn掺杂Ni(OH)₂) (Ni_1-_xMn_x(OH)₂), 循环稳定性

Abstract:

Manganese doped Ni_1-_xMn_x(OH)₂ (x=0.1, 0.2, 0.3, 0.4) was prepared by buffer solution method. X-ray diffraction (XRD) measurements show that the samples are mainly composed of β-Ni(OH)₂ with little amount of Mn₃O₄ phase. Cyclic voltammetry results show that the integral area of reduction peak of Ni_0.8Mn_0.2(OH)₂ is the largest among the samples. The constant current charge-discharge tests show that the discharge capacity of Ni_0.8Mn_0.2(OH)₂ reaches 271.8 mAh/g at the current density of 100 mA/g, which is higher than that of other samples and commercial β-Ni(OH)₂ (253.6 mAh/g). At the current density of 300 and 500 mA/g, Ni_0.8Mn_0.2(OH)₂remains the highest discharge capacity of 294.7 and 291.5 mAh/g, respectively. Moreover, the cycling stability of Ni_1-_xMn_x(OH)₂ is superior to commercial β-Ni(OH)₂. All data indicate that Mn doped Ni(OH)₂ can improve the capacity and cycling stability of nickel electrodes, and greatly reduce the cost of nickel electrodes.

Key words: buffer solution method, Mn doped Ni(OH)₂, cycling stability

中图分类号:

TQ174

肖民,邢如月,姚寿广,程杰,申亚举,杨裕生. Mn掺杂Ni(OH)₂的合成及电化学性能研究[J]. 无机材料学报, 2019, 34(7): 703-708.

XIAO Min,XING Ru-Yue,YAO Shou-Guang,CHENG Jie,SHEN Ya-Ju,YANG Yu-Sheng. Preparation and Electrochemical Performance of Mn Doped Ni(OH)₂[J]. Journal of Inorganic Materials, 2019, 34(7): 703-708.

图/表 6

图1 商用β-Ni(OH)2及Ni1-xMnx(OH)2的XRD图谱

Fig. 1 XRD patterns of commercial β-Ni(OH)2 and Ni1-xMnx(OH)2 (x=0.1, 0.2, 0.3, 0.4)

图2 Ni0.8Mn0.2(OH)2 (a)、Ni0.6Mn0.4(OH)2 (b)的SEM照片及对应的EDS元素分布图

Fig. 2 SEM images of Ni0.8Mn0.2(OH)2 (a), Ni0.6Mn0.4(OH)2 (b) and corresponding elemental mapping images (Mn, Ni)

图3 商用β-Ni(OH)2及Ni1-xMnx(OH)2的CV曲线(0.5 mV/s)

Fig. 3 CV curves of commercial β-Ni(OH)2 and Ni1-xMnx(OH)2 (x=0.1, 0.2, 0.3, 0.4) at the scan rate of 0.5 mV/s

图4 实验电池(0#, 1#, 2#, 3#, 4#)的第20次充放电曲线(电流密度为100 mA/g)

Fig. 4 The 20th charge-discharge curves of experimental cells (0#, 1#, 2#, 3#, 4#) at 100 mA/g

图5 实验电池(0#,1#,2#,3#,4#)放电比容量与循环次数的关系曲线(电流密度为100 mA/g)

Fig. 5 Discharge capacities of experimental cells (0#,1#,2#,3#,4#) at 100 mA/g vs. cycles

图6 实验电池(0#,1#,2#,3#,4#)在不同倍率下的第5次充放电曲线

Fig. 6 The 5th charge-discharge curves of experimental cells (0#,1#,2#,3#,4#) (a) 300 mA/g; (b) 500 mA/g

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Mn掺杂Ni(OH)₂的合成及电化学性能研究

Preparation and Electrochemical Performance of Mn Doped Ni(OH)₂

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