V2.46TiFe0.54-Ni烧结电极电化学性能的研究

Electrochemical Properties of Sintered V2.46TiFe0.54-Ni Electrodes

摘要:

V2.46TiFe0.54合金颗粒与Ni粉混合压成电极后在850~1100 ℃条件下进行烧结，时间5 min，研究了烧结温度对其形貌特征及电化学性能的影响。经XRD及SEM（EDS）分析表明，烧结后，V2.46TiFe0.54合金颗粒与Ni粉之间发生了V、Ti、Ni的扩散，形成了扩散中间层，该中间层的厚度随烧结温度的升高而增厚。在中间层的作用下，Ni粉较好地包覆在合金颗粒表面。电化学测试结果显示，随烧结温度的升高，电极的电化学催化性能及交换电流密度逐渐增大；最大放电容量先增大后减小，在900 ℃时达到最大

Abstract:

V2.46TiFe0.54 alloy granules and Ni powder were mixed and pressed into electrodes greens, which were sintered at 850~1100 ℃ for 5 min. The influences of sinter temperature on the morphology and the electrochemical properties of the sintered V2.46TiFe0.54-Ni electrodes were investigated. XRD and SEM (EDS) analysises show that the V, Ti and Ni elements interdiffuse between the granules and Ni powders took places, resulting in forming a diffusing interlayer, its thickness increased with raising of the sintering temperature. The alloy granule surfaces were coated by the Ni powder. The results of electrochemical measurements show that the electrochemical catalytic property and exchange current density increased with raising of sinter temperature. The maximum discharge capacity increased first, then decreased with raising of sinter temperature, the peak value is about 466 mAh/g at 900 ℃, Moreover, the cyclic stability of the sintered electrodes was also improved.