Positive electrode active material for lithium secondary battery and its precursor, electrode for lithium secondary battery, lithium secondary battery
A positive active material, lithium secondary battery technology, applied in the direction of active material electrodes, secondary batteries, battery electrodes, etc., to achieve the effect of large discharge capacity
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Embodiment 1-1
[0115] Weigh 14.08 g of cobalt sulfate 7 hydrate, 21.00 g of nickel sulfate 6 hydrate, and 65.27 g of manganese sulfate 5 hydrate, and dissolve them all in 200 ml of ion-exchanged water to make the molar ratio of Co:Ni:Mn 12.50:19.94 : 67.56 of 2.0M sulfate solution in water. On the other hand, inject 750ml of ion-exchanged water into a 2L reaction tank to make CO 2 The gas was bubbled for 30 min, so that the CO 2 Dissolved in ion-exchanged water. The temperature of the reaction tank was set at 50°C (±2°C), and the reaction tank was stirred at a rotation speed of 700rpm using a paddle blade equipped with a stirring motor, while the aforementioned sulfate solution was added dropwise at a rate of 3ml / min. Here, the aqueous solution containing 1.0M sodium carbonate, 1.0M lithium carbonate and 0.4M ammonia is appropriately added dropwise from the beginning of the dropwise addition until the end, so that the pH in the reaction tank is always maintained at 7.9 (± 0.05 ). After c...
Embodiment 1-2～1-6
[0119]Instead of making the molar ratio (molar ratio of Na / Li) of sodium carbonate and lithium carbonate contained in the aqueous solution added dropwise when making the coprecipitated carbonate precursor be set to 1 / 1 [M], as in Example 1 of Table 1 -2 to 1-6 were changed, except that it was carried out in the same manner as in Example 1-1, and the Na-containing lithium transition metal composite oxides of Examples 1-2 to 1-6 were produced.
Embodiment 1-7
[0121] Weigh 14.08 g of cobalt sulfate 7 hydrate, 21.00 g of nickel sulfate 6 hydrate, and 65.27 g of manganese sulfate 5 hydrate, and dissolve them all in 200 ml of ion-exchanged water to make the molar ratio of Co:Ni:Mn 12.50:19.94 : 67.56 of 2.0M sulfate solution in water. On the other hand, inject 750ml of ion-exchanged water into a 2L reaction tank to make CO 2 The gas was bubbled for 30 min, so that the CO 2 Dissolved in ion-exchanged water. The temperature of the reaction tank was set at 50°C (±2°C), and the reaction tank was stirred at a rotation speed of 700rpm using a paddle blade equipped with a stirring motor, while the aforementioned sulfate solution was added dropwise at a rate of 3ml / min. Here, the pH in the reaction tank was kept at 7.9 (±0.05) by appropriately dropping an aqueous solution containing 2.0 M sodium carbonate and 0.4 M ammonia from the start of the dropping to the end. After completion of the dropwise addition, stirring in the reaction tank was...
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