Positive electrode active mater, method for producing the same, and non-aqueous electrolyte secondary battery
A positive active material, non-aqueous electrolyte technology, applied in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve problems such as capacity decline, and achieve the effect of excellent life characteristics
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Embodiment 1
[0093] (i) Fabrication of the positive plate
[0094] FIG. 2 shows a scanning electron microscope (SEM) enlarged photograph of NiO manufactured by Kanto Chemical Co., Ltd. (the average particle diameter of the secondary particles is about 15 μm). Figure 2 is a 3000 times magnified photo.
[0095] To this 3.738g (50mmol) NiO was added 0.525 equivalents of Na 2 o 2 , and mix well in an agate mortar. Then, the obtained mixture was reacted in an oxygen atmosphere at 650° C. for 12 hours, thereby obtaining NaNiO having an average particle diameter of about 5 μm as primary particles of a nickel-sodium-containing composite oxide. 2 . The NaNiO 2 The enlarged scanning electron microscope (SEM) photographs of the particles are shown in FIGS. 3 and 4 . Figure 3 is 3000 times and Figure 4 is 10000 times enlarged photos.
[0096] Next, the obtained NaNiO 2 Added to LiNO melted at 300°C 3 , and allowed to react in dry air at a dew point of -40°C for 3 hours. In addition, at this ...
Embodiment 2
[0108] Ni(OH) 2 and Mn 2 o 3 Mix in equal amounts, moderately mix and pulverize with a wet ball mill. The obtained mixed pulverized product was reacted at 700° C. for 12 hours in an oxygen atmosphere to obtain NiMnO having an average particle diameter of secondary particles of 5 μm. 3 .
[0109] The obtained NiMnO 3 Instead of NiO, except that, the rest was carried out in the same manner as in Example 1 to obtain NaNi with an average particle diameter of 3 μm as the primary particle of the nickel-sodium composite oxide. 0.5 mn 0.5 o 2 .
[0110] Then, use NaNi 0.5 mn 0.5 o 2 instead of NaNiO 2 , except that, the rest was performed in the same manner as in Example 1 to obtain a positive electrode active material B composed of a nickel-containing lithium composite oxide.
[0111] The composition of the positive electrode active material B determined by ICP analysis is Li 0.99 Na 0.01 Ni 0.5 mn 0.5 o 2 . As a result of observing the enlarged SEM photograph of th...
Embodiment 3
[0114] Dissolved NiSO at a concentration of 0.3337mol / L 4 ·6H 2 O, dissolved MnSO with a concentration of 0.667mol / L 4 ·5H 2 Add 1M LiOH·H dropwise to the mixed sulfuric acid solution of O 2 O solution, a coprecipitate was obtained. Then, the coprecipitate was filtered, dried, pulverized, and classified to obtain a manganese-nickel composite hydroxide having an average secondary particle diameter of 10 μm. Add 0.6 equivalent of Na to the manganese-nickel composite hydroxide 2 o 2 , mix well in an agate mortar. The resulting mixture was reacted at 620° C. for 12 hours under an oxygen atmosphere, thereby obtaining a nickel-containing sodium composite oxide NaNi having an average primary particle diameter of 2 μm. 0.33 mn 0.67 o 2 .
[0115] Next, the resulting NaNi 0.33 mn 0.67 o 2Added to molten LiNO at 400 °C 3 , and allowed to react in dry air at a dew point of -40°C for 3 hours. In addition, at this time LiNO 3 relative to NaNi 0.33 mn 0.67 o 2 The amount ...
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