摘要
The degradation of La 0.8 Pr 0.2 Ni 3.55 Co 0.75 Mn 0.4 Al 0.3 alloy electrode during charge discharge cycles was studied with analytical electron microscope (AEM) and scanning electron microscope (SEM). During the cycles, the alloy particles of the negative electrode were pulverized gradually. After 200 cycles, the pulverizing process basically ended and the larger particles were pulverized to below 10 μm. The particles were oxided at the rate of about 0.1 μm/100 times cycles. The oxide layer was porous and consisted of the La(OH) 3 and oxides of Pr, Co and Ni. Most of Pr, Mn and almost all of Al in the oxide layer were dissolved into the electrolyte. The oxidation of the alloy particles was one of the main factors of the decay of the discharge capacity of the negative electrode during the cycles.
The degradation of La 0.8 Pr 0.2 Ni 3.55 Co 0.75 Mn 0.4 Al 0.3 alloy electrode during charge discharge cycles was studied with analytical electron microscope (AEM) and scanning electron microscope (SEM). During the cycles, the alloy particles of the negative electrode were pulverized gradually. After 200 cycles, the pulverizing process basically ended and the larger particles were pulverized to below 10 μm. The particles were oxided at the rate of about 0.1 μm/100 times cycles. The oxide layer was porous and consisted of the La(OH) 3 and oxides of Pr, Co and Ni. Most of Pr, Mn and almost all of Al in the oxide layer were dissolved into the electrolyte. The oxidation of the alloy particles was one of the main factors of the decay of the discharge capacity of the negative electrode during the cycles.
