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Citation: Zhang Hao, Zhu Songran, Luo Ping. THE SEGREGATION OF Mn IN HYDRIDE ELECTRODES[J]. Chinese Journal of Applied Chemistry, ;1992, 9(2): 123-126. shu

THE SEGREGATION OF Mn IN HYDRIDE ELECTRODES

Zhang Hao ^1,, ,
Zhu Songran ¹ ,
Luo Ping ²

1.
1. Department of Applied Chemistry, Tianjin University, Tianjin 300072;
2.
2. Tianjin Institute of Power Sources, Tianjin 300072

Corresponding author: Zhang Hao,
Received Date: 10 June 1991
Available Online: 30 August 1991

The segregation and dissolution of M_n at the electrodes of hydrogen storage alloys, LaMmMnCoNi and AlMmMnCoNi (Mm-alloy of rare earth rich in lanthanum), have been studied in cycling course using XPS and electron probe techniques. It was observed that Mn inside the electrodes dispersed rapidly to the electrode surfaces in the active stage, forming MnO₂. Both the capacities of the electrodes and the Mn content on the electrode surfaces gave maximum values in the cycling course, The segregation and dissolution of Mn in the hydrogen storage alloy electrode containing Al were slower than that in the alloy electrode without Al, The alloy electrode with and without Al in 80% discharge showed a cycling life of 520 and 350 times, respectively. It is concluded that Al may inhibit the segregation and dissolution of Mn and extend the cycling life of the eletrode.
- hydride electrode,
- segregation,
- Mn
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