An AC impedance study of self-discharge mechanism of nickel-metal hydride (Ni-MH) battery using Mg2Ni-type hydrogen storage alloy anode

被引：41

作者：

Cui, N ^{[1
]}

Luo, JL ^{[1
]}

机构：

[1] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada

来源：

ELECTROCHIMICA ACTA | 2000年 / 45卷 / 24期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Ni-MH battery; hydrogen storage alloy; magnesium alloy electrode; self-discharge;

D O I：

10.1016/S0013-4686(00)00493-X

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The self-discharge mechanism during storage in open-circuit states of a Ni-MH battery using a Mg,Ni-type hydrogen storage alloy anode was investigated by electrochemical impedance spectroscopy (EIS) and X-ray diffraction (XRD). The loss of discharge capacity for this battery can be ascribed to two causes: (i) desorption of hydrogen from the Mg1.95Y0.05Ni0.92Al0.08 hydride anode; and (ii) anode surface degradation resulting from oxidation of the magnesium alloy in the electrolyte. Al the higher open-circuit voltages (OCV). the former was mainly responsible for a high self-discharge rate, while the latter might dominate the loss of capacity at the lower OCV. XRD results confirmed that Mg(OH)(2) formed on the magnesium alloy anode after storage in an open-circuit condition for 20 days. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：3973 / 3981

页数：9

共 31 条

[1] ALLOYS FOR HYDROGEN STORAGE IN NICKEL-HYDROGEN AND NICKEL METAL HYDRIDE BATTERIES [J].

ANANI, A ;

VISINTIN, A ;

PETROV, K ;

SRINIVASAN, S ;

REILLY, JJ ;

JOHNSON, JR ;

SCHWARZ, RB ;

DESCH, PB .

JOURNAL OF POWER SOURCES, 1994, 47 (03) :261-275

[2] CHARACTERISTICS OF MAGNESIUM-BASED HYDROGEN-STORAGE ALLOY ELECTRODES [J].

CUI, N ;

LUAN, B ;

LIU, HK ;

ZHAO, HJ ;

DOU, SX .

JOURNAL OF POWER SOURCES, 1995, 55 (02) :263-267

[3] Magnesium-based hydrogen storage materials modified by mechanical alloying [J].

Cui, N ;

He, P ;

Luo, JL .

ACTA MATERIALIA, 1999, 47 (14) :3737-3743

[4] Electrochemical study of hydrogen diffusion behavior in Mg2Ni-type hydrogen storage alloy electrodes [J].

Cui, N ;

Luo, JL .

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 1999, 24 (01) :37-42

[5] Effects of oxide additions on electrochemical hydriding and dehydriding behavior of Mg2Ni-type hydrogen storage alloy electrode in 6 M KOH solution [J].

Cui, N ;

Luo, JL .

ELECTROCHIMICA ACTA, 1998, 44 (05) :711-720

[6] Effects of yttrium additions on the electrode performance of magnesium-based hydrogen storage alloys [J].

Cui, N ;

Luan, B ;

Zhao, HJ ;

Liu, HK ;

Dou, SX .

JOURNAL OF ALLOYS AND COMPOUNDS, 1996, 233 (1-2) :236-240

[7] Synthesis and electrode characteristics of the new composite alloys Mg2Ni-xwt%Ti2Ni [J].

Cui, N ;

Luan, B ;

Zhao, HJ ;

Liu, HK ;

Dou, SX .

JOURNAL OF ALLOYS AND COMPOUNDS, 1996, 240 (1-2) :229-234

[8] AC impedance studies of the discharge process of a Mg2Ni-type hydrogen storage alloy electrode in 6M KOH solution [J].

Cui, N ;

Luo, JL .

JOURNAL OF ALLOYS AND COMPOUNDS, 1998, 265 (1-2) :305-310

[9] Synthesis and characterization of nanocrystalline magnesium-based hydrogen storage alloy electrode materials [J].

Cui, N ;

He, P ;

Luo, JL .

ELECTROCHIMICA ACTA, 1999, 44 (20) :3549-3558

[10]

Cui N, 1997, THESIS U WOLLONGONG

← 1 2 3 4 →