Novel surface treatment for hydrogen storage alloy in Ni/MH battery

Xiangyu Zhao; Liqun Ma; Yi Ding; Meng Yang; Xiaodong Shen

doi:10.1016/j.ijhydene.2009.02.033

Novel surface treatment for hydrogen storage alloy in Ni/MH battery

Xiangyu Zhao, Liqun Ma, Yi Ding, Meng Yang, Xiaodong Shen

College of Materials Science and Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

A novel surface treatment for the MlNi_3.8Co_0.75Mn_0.4Al_0.2 (La-rich mischmetal) hydrogen storage alloy has been carried out by using an aqueous solution of HF and KF with a little addition of KBH₄. The results of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that rough surface was formed and Al was partly dissolved into the solution after the treatment. The result of XPS indicated the formation of Ni₃B and LaF₃ compounds on the alloy surface by the treatment. The probable chemical reaction mechanism for the surface treatment was introduced. The treatment resulted in significant improvements in the activation property, discharge capacity and cycle life of the alloy, especially the high rate dischargeability (HRD). The HRD of the treated alloy still remained 54.9% while that of the untreated one was only 15.1% at a discharge current density of 1200 mA/g.

Original language	English
Pages (from-to)	3506-3510
Number of pages	5
Journal	International Journal of Hydrogen Energy
Volume	34
Issue number	8
DOIs	https://doi.org/10.1016/j.ijhydene.2009.02.033
State	Published - May 2009

Keywords

High rate dischargeability
Hydrogen storage
Ni-B
Surface treatment

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10.1016/j.ijhydene.2009.02.033

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title = "Novel surface treatment for hydrogen storage alloy in Ni/MH battery",

abstract = "A novel surface treatment for the MlNi3.8Co0.75Mn0.4Al0.2 (La-rich mischmetal) hydrogen storage alloy has been carried out by using an aqueous solution of HF and KF with a little addition of KBH4. The results of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that rough surface was formed and Al was partly dissolved into the solution after the treatment. The result of XPS indicated the formation of Ni3B and LaF3 compounds on the alloy surface by the treatment. The probable chemical reaction mechanism for the surface treatment was introduced. The treatment resulted in significant improvements in the activation property, discharge capacity and cycle life of the alloy, especially the high rate dischargeability (HRD). The HRD of the treated alloy still remained 54.9% while that of the untreated one was only 15.1% at a discharge current density of 1200 mA/g.",

keywords = "High rate dischargeability, Hydrogen storage, Ni-B, Surface treatment",

author = "Xiangyu Zhao and Liqun Ma and Yi Ding and Meng Yang and Xiaodong Shen",

year = "2009",

month = may,

doi = "10.1016/j.ijhydene.2009.02.033",

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volume = "34",

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journal = "International Journal of Hydrogen Energy",

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TY - JOUR

T1 - Novel surface treatment for hydrogen storage alloy in Ni/MH battery

AU - Zhao, Xiangyu

AU - Ma, Liqun

AU - Ding, Yi

AU - Yang, Meng

AU - Shen, Xiaodong

PY - 2009/5

Y1 - 2009/5

N2 - A novel surface treatment for the MlNi3.8Co0.75Mn0.4Al0.2 (La-rich mischmetal) hydrogen storage alloy has been carried out by using an aqueous solution of HF and KF with a little addition of KBH4. The results of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that rough surface was formed and Al was partly dissolved into the solution after the treatment. The result of XPS indicated the formation of Ni3B and LaF3 compounds on the alloy surface by the treatment. The probable chemical reaction mechanism for the surface treatment was introduced. The treatment resulted in significant improvements in the activation property, discharge capacity and cycle life of the alloy, especially the high rate dischargeability (HRD). The HRD of the treated alloy still remained 54.9% while that of the untreated one was only 15.1% at a discharge current density of 1200 mA/g.

AB - A novel surface treatment for the MlNi3.8Co0.75Mn0.4Al0.2 (La-rich mischmetal) hydrogen storage alloy has been carried out by using an aqueous solution of HF and KF with a little addition of KBH4. The results of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that rough surface was formed and Al was partly dissolved into the solution after the treatment. The result of XPS indicated the formation of Ni3B and LaF3 compounds on the alloy surface by the treatment. The probable chemical reaction mechanism for the surface treatment was introduced. The treatment resulted in significant improvements in the activation property, discharge capacity and cycle life of the alloy, especially the high rate dischargeability (HRD). The HRD of the treated alloy still remained 54.9% while that of the untreated one was only 15.1% at a discharge current density of 1200 mA/g.

KW - High rate dischargeability

KW - Hydrogen storage

KW - Ni-B

KW - Surface treatment

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U2 - 10.1016/j.ijhydene.2009.02.033

DO - 10.1016/j.ijhydene.2009.02.033

M3 - 文章

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SN - 0360-3199

VL - 34

SP - 3506

EP - 3510

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 8

ER -

Novel surface treatment for hydrogen storage alloy in Ni/MH battery

Abstract

Keywords

UN SDGs

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