Influence of Oxygen Content on Microstructure and Electrochemical Properties of V2-xTi0.5Cr0.5NiOx (x=0∼0.35) Hydrogen Storage Alloys

被引：1

作者：

Tong Yanwei ^{[1
]}

Gao Jiacheng ^{[1
]}

Deng Gang ^{[2
]}

Zhang Xuefeng ^{[2
]}

Wang Nengwei ^{[2
]}

机构：

[1] Chongqing Univ, Chongqing 400044, Peoples R China

[2] Panzhihua Univ, Panzhihua 617000, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2015年 / 44卷 / 05期

关键词：

V based hydrogen storage alloy; oxygen content; microstructure; electrochemical property; STRUCTURAL CHARACTERISTICS; ELECTRODE PROPERTIES; ZR8NI19X2; X; NI; MG; TI; PERFORMANCE; BATTERY; PHASE; SN;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To improve the charge-discharge cycle stability of V-based hydrogen storage alloys, the different contents of oxygen (0) element were introduced into the V2Ti0.5Cr0.5Ni alloy, and the structures and electrochemical properties of the V2Ti0.5Cr0.5NiOx (x=0 similar to 0.35) alloys were investigated. The structural investigations show that the alloys with lower 0 content mainly consist of a V-based solid solution phase with a bcc structure and a TiNi-based secondary phase, while a new phase Ti4Ni2O is observed for the alloys with higher 0 content. With increasing of 0 content, the maximum discharge capacity for the V2-xTi0.5Cr0.5NiOx (x=0 similar to 0.35) alloy electrodes decreases from 366.8 mAh/g (x=0) to 225.3 mAh/g (x=0.35), while the cycle stability of the alloy electrodes first increases from 69.9% (x=0) to 83.7% (x=0.2) and then decreases to 76.9% (x=0.35). Moreover, the high rate discharge ability, the exchange current density and the hydrogen diffusion coefficient of the alloys first increase and then decrease with increasing of O content.

引用

页码：1052 / 1056

页数：5

共 22 条

[21] Effects of substituting Ni with Cu on the microstructures and electrochemical characteristics of the as-cast and quenchedLa0.7Mg0.3Ni2.55-xCo0.45Cux(x=0-0.4)electrode alloys [J].