Hydrogen storage powder and process for preparing same
A powder and hydrogen preparation technology, which is applied in chemical instruments and methods, hydrogen, electrode manufacturing, etc., can solve the problems of high production cost of battery replacement
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example 1
[0061] A 2 kg sample was taken from the same ingot prepared in Comparative Example 1. The sample was put into the same hydrogen reactor (Figure 2) and underwent the same evacuation, hydrogenation, dehydrogenation process as in Comparative Example 1. After cooling the sample to room temperature, a constant flow rate of 5 ccm / s of dry air was introduced into the reactor until reaching one atmospheric pressure, which was then immediately evacuated with a pump. This slow oxidation is repeated once more. The powder thus oxidized was taken out and an electrode was fabricated in the same manner as described in Comparative Example 2 and tested under the same filled full cell conditions. Example 1 gave increased activation over Control 2.
example 2
[0063] 2 kilograms of samples in the same ingot prepared in Comparative Example 1 were put into the same hydrogen reactor (Figure 2) and passed through the same evacuation, hydrogenation, and dehydrogenation processes as in Comparative Example 2. After the sample was cooled to room temperature, the sample was subjected to a controlled oxidation reaction using a flow of dry air introduced into the reactor at a rate that kept the increase in reactor temperature at about 1 °C or less. Once the reactor reached 1 atmosphere, it was evacuated immediately with a pump. This controlled oxidation is repeated one more time. The controlled oxidation powder was fabricated into electrodes in the same manner as described in Comparative Example 2 and tested under the same filled full cell conditions. Example 2 gave easier activation than Control 2.
example 3
[0065] Example 3 was prepared in a similar manner to that of Example 1 except that an 80% argon / 20% oxygen mixture was used instead of dry air. The powder was fabricated into an electrode in the same manner as described in Comparative Example 2. This electrode was also tested under the same filled full cell conditions as in Comparative Example 2, and the results are listed in Table 1 and plotted in Figure 4 to show a comparison of the enhanced activation provided by the controlled oxidation reaction. .
[0066] Table 1 Electrochemical discharge capacity (mAh / g) in the generation cycle
[0067] Loop # Control Example 2 Example 3
[0068] 1 151 310
[0069] 2 349 364
[0070] 3 366 368
[0071] 4 373 364
[0072] 5 372 360
[0073] 6 372 366
[0074] The results are plotted in Figure 4 and show the improved activation of samples prepared according to the invention using a controlled oxidation reaction and with built surface oxides.
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