Abstract
The effects of different heat treatment temperature on the high rate discharge ability of MLNi3.8Co0.75Mn0.4Al0.2 hydrogen storage alloy were investigated. XRD pattern showed the alloy lattice volume had enlarged after heat treatment. The result of electrochemistry testing showed that the high rate discharge ability (HRD) of MLNi3.8Co0.75Mn0.4Al0.2 hydrogen storage alloy was obviously improved after heat treatment. And the HRD of the heat-treatment hydrogen storage alloy electrode remained over 80% under the 900 mA/g discharge conditions while the original hydrogen storage alloy electrode cannot discharge. After heat treatment, the exchange current density increased and the polarization resistance reduced. The electrode depolarization of the alloy was improved in the discharge process. With a 673 K of heat treatment, the exchange current and the high rate discharge ability of the hydrogen storage alloy electrode were both the highest and the polarization resistance was the lowest among these of the treated alloys.
| Original language | English |
|---|---|
| Pages (from-to) | 28-31+35 |
| Journal | Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology |
| Volume | 30 |
| Issue number | 9 |
| State | Published - Sep 2008 |
Keywords
- Electrochemical performance
- Heat treatment
- High rate dischargeability
- Hydrogen storage alloy