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Citation: YIN Wen-Ya, ZHAO Min-Shou. Structure and Electrochemical Properties of Ti_0.8Zr_0.2V_1.1Mn_0.9-xNi_0.4Cr_x Hydrogen Storage Almoys[J]. Chinese Journal of Applied Chemistry, ;2008, 25(2): 162-168. shu

Structure and Electrochemical Properties of Ti_0.8Zr_0.2V_1.1Mn_0.9-xNi_0.4Cr_x Hydrogen Storage Almoys

YIN Wen-Ya ^a,b ,
ZHAO Min-Shou ^a,,

1.
a Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022;
2.
b Graduate School of the Chinese Academy of Sciences, Beijing

Corresponding author: ZHAO Min-Shou,
Received Date: 16 January 2007
Available Online: 26 April 2007
Fund Project: 国家自然科学基金(20171042)资助项目 (20171042)

The structure and electrochemical properties of Ti_0.8Zr_0.2V_1.1Mn_0.9-xNi_0.4Cr_x(x=0.0~0.4) solid solution electrode alloys were investigated systematically.It was found that these alloys mainly consisted of a solid solution phase with a body centered cubic(bcc) structure and a C14 Laves secondary phase.The solid solution alloys showed easy activation behavior(to reach the maximum capacity within 3 cycles) and favorable rate dischargeability as a negative electrode material in Ni-MH batteries.The cycle stability of the alloy electrodes was improved markedly with the increase of Cr content in the alloys because the substitution of Cr for Mn suppresses vanadium dissolution in the alkali solution.The cycle stability parameter S₂₀ of the alloy electrodes increased from 6.4% to 73.8% with x increasing from 0 to 0.4.The maximum discharge capacity of the alloy electrodes decreased from 420 mA·h/g to 279 mA·h/g with x changing from 0 to 0.4.The high temperature discharge capacity of the alloy electrodes decreased from 744 mA·h/g to 246 mA·h/g with x changing from 0 to 0.4 at 333 K.Furthermore,both the exchange current density and the hydrogen diffusion coefficient of the alloy electrode increased first and then decreased with the amount of Mn substituted by Cr increasing,and the maximum values of them were 275 mA/g and 5.956×10^-10 cm²/s with x=0.3,respectively.
- metal hydride,
- solid solution alloy,
- negative electrode material,
- electrochemical property
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Structure and Electrochemical Properties of Ti_0.8Zr_0.2V_1.1Mn_0.9-xNi_0.4Cr_x Hydrogen Storage Almoys