Cathode active material and lithium secondary battery including same
A technology of positive electrode active materials and secondary particles, which is applied in the direction of secondary batteries, lithium batteries, active material electrodes, etc., can solve the problems of lithium secondary battery degradation, unstable structure of positive electrode active materials, and structural instability, and achieve improved High-temperature operating characteristics, the effect of improving low thermal stability
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preparation example 1
[0132] Preparation example 1. Preparation of positive electrode active material
Embodiment 1
[0134] After adding 20 liters of distilled water and 1 kg of ammonia in the batch reactor (90L batch reactor (90L batch reactor)), feed N into the reactor at a speed of 1.5 liters / minute. 2 Gas, the reactor temperature was maintained at 45°C, and stirring was performed at 350rpm. As an aqueous solution for nucleation, 53 g of an aqueous solution having a concentration of 2.5 M in which nickel sulfate, cobalt sulfate, and manganese sulfate were mixed in a molar ratio of 95:3.5:1.5 was added.
[0135] The above-prepared 2.5M aqueous solution for nucleation was continuously added at a rate of 2.4 liters / hour, and 28% aqueous ammonia was continuously added at a rate of 0.3 liters / hour. In addition, the input amount of 25% sodium hydroxide solution was adjusted so that the pH value in the reactor was maintained at 11 to 12, and at the same time, continuous reaction was carried out. At this time, the stirring speed was adjusted to 350 rpm.
[0136] As the aqueous solution for shel...
Embodiment 2
[0143] In addition to H 3 BO 3 Mixed with the above lithium composite oxide, while keeping O 2 In the state of the atmosphere, the temperature was raised to 300° C. at a rate of 2° C. per minute, and then an additional heat treatment (third heat treatment) was performed for 8 hours, and the positive electrode active material was prepared in the same manner as in Example 1. At this point, weigh H 3 BO 3 , so that the content of B in the mixture is 400ppm. The average particle diameter D50 of the lithium composite oxide contained in the positive electrode active material was measured to be 16.5 μm.
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