镍氢电池负极材料V2Ti0.5Cr0.5Ni1-xMox(x=0.02~0.08)的结构和电化学性能

doi:10.15541/jim20150341

摘要/Abstract

摘要：

为了改善镍氢电池负极材料的循环稳定性能, 采用真空感应电弧熔炼炉制备了V₂Ti_0.5Cr_0.5Ni_1-_xMo_x (x=0.02~0.08)合金, 分析了不同含量的Mo替代Ni之后对合金电极的组织结构及电化学性能的影响。研究结果表明, 电极材料主要由BCC结构的V基固溶体主相和TiNi二次相组成, 随着合金中Mo替代Ni含量x由0.02增加到0.08, 合金电极的放电容量先增加后降低, 合金电极的循环稳定性能以及电化学动力学性能先得到改善而后降低, 合金电极的综合性能均在x=0.04时达到最好。

关键词: 镍氢电池, 负极材料, 循环稳定性, 电化学性能

Abstract:

In order to improve the cycle stability of Ni/MH battery, the V₂Ti_0.5Cr_0.5Ni_1-_xMo_x(x=0.02-0.08) electrode alloys were prepared by arc-melting, and the effects of Mo content on microstructure and electrochemical properties were investigated systematically. The results show that all of the electrode materials mainly consist of a V-based solid solution phase with BCC structure and TiNi-based secondary phase which precipitates along the grain boundary of the BCC main phase. The electrochemical measurements indicate that the maximum discharge capacity of the alloy electrode increases firstly and then decreases with increasing x from 0.02 to 0.08. The cycle stability and electrochemical kinetic response of the alloy electrodes are strengthened firstly and then weakened, and reach the best performance at x=0.04.

Key words: Ni-MH battery, anode material, cycle stability, electrochemical property

中图分类号:

TG146

同艳维, 张雪峰, 方民宪. 镍氢电池负极材料V₂Ti_0.5Cr_0.5Ni_1-_xMo_x(x=0.02~0.08)的结构和电化学性能[J]. 无机材料学报, 2016, 31(2): 148-152.

TONG Yan-Wei, ZHANG Xue-Feng, FANG Min-Xian. Structures and Electrochemical Properties of V₂Ti_0.5Cr_0.5Ni_1-_xMo_x(x=0.02-0.08) Ni/MH Battery Anode Materials[J]. Journal of Inorganic Materials, 2016, 31(2): 148-152.

图/表 8

图1 V2Ti0.5Cr0.5Ni1-xMox (x=0.02~0.08)合金的XRD图谱

Fig. 1 XRD patterns of V2Ti0.5Cr0.5Ni1-xMox (x=0.02-0.08) alloys

图2 V2Ti0.5Cr0.5Ni1-xMox合金的显微结构

Fig. 2 Metallographs of V2Ti0.5Cr0.5Ni1-xMox alloys (a) x= 0.02; (b) x=0.04; (c) x=0.06; (d) x=0.08

图3 V2Ti0.5Cr0.5Ni1-xMox (x=0.02~0.08)电极的循环稳定性能

Fig. 3 Cycle stability of V2Ti0.5Cr0.5Ni1-xMox (x=0.02-0.08) electrodes

表1 V2Ti0.5Cr0.5Ni1-xMox (x=0.02~0.08)电极电化学性能参数

Table 1 Electrochemical parameters of V2Ti0.5Cr0.5Ni1-xMox (x=0.02-0.08) electrodes

Sample	(C₂₀/C_max)/%	I₀/(mA·g^-1)	D/(×10¹¹, cm²·s^-1)
x=0.02	80.4	54	5.0
x=0.04	85.0	68	6.8
x=0.06	81.5	60	5.9
x=0.08	79.4	38	4.7

图4 V2Ti0.5Cr0.5Ni1-xMox (x=0.02~0.08)电极的高倍率放电性能

Fig. 4 High rate discharge capacity of V2Ti0.5Cr0.5Ni1-xMox (x=0.02-0.08) electrodes

图5 V2Ti0.5Cr0.5Ni1-xMox (x=0.02~0.08)电极的电化学阻抗谱

Fig. 5 EIS spectra of V2Ti0.5Cr0.5Ni1-xMox (x=0.02-0.08) electrodes

图6 V2Ti0.5Cr0.5Ni1-xMox (x=0.02~0.08)电极的线性极化曲线

Fig. 6 Linear polarization curves of V2Ti0.5Cr0.5Ni1-xMox (x= 0.02~0.08) electrodes

图7 V2Ti0.5Cr0.5Ni1-xMox (x=0.02~0.08)电极的阳极电流-时间响应曲线

Fig. 7 Anodic current-time responses of V2Ti0.5Cr0.5Ni1-xMox (x=0.02-0.08) electrodes

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镍氢电池负极材料V₂Ti_0.5Cr_0.5Ni_1-_xMo_x(x=0.02~0.08)的结构和电化学性能

Structures and Electrochemical Properties of V₂Ti_0.5Cr_0.5Ni_1-_xMo_x(x=0.02-0.08) Ni/MH Battery Anode Materials

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