Positive active material for lithium secondary battery and methode of manufacturing the same
A technology for positive electrode active materials and lithium secondary batteries, applied in secondary batteries, cleaning methods using liquids, battery electrodes, etc., can solve the problems of surface damage of positive electrode active material particles, inability to fully remove impurities, etc., and improve electrical performance , Improved stability and capacity/power retention, enhanced structural stability and crystal stability
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experiment example 1
[0171] Examples and Comparative Examples
[0172] In Examples and Comparative Examples, lithium metal oxides (Li[Ni 0.88 co 0.09 mn 0.03 ]O 2 or Li[Ni 0.8 co 0.1 mn 0.1 ]O 2 ) or dopants including Al, Zr and Ti or Al 2 o 3 , ZrO 2 and TiO 2 coated lithium metal oxide. Deionized water (DIW) with a resistivity of less than 25 MΩcm is used in the washing process.
Embodiment
[0174] 1 kg of pure water (DIW) was put into a 2L reactor, and dissolved oxygen in the pure water was sufficiently removed by bubbling nitrogen gas for 30 minutes. Then, the thio-based compounds listed in Table 1 were added in the amount described in Table 1 based on the weight of the lithium metal oxide, and stirred for 30 minutes. Further, 1 kg of the lithium metal oxide in Table 1 was added as the positive electrode active material, stirred at a speed of 300 rpm for 30 minutes in a nitrogen atmosphere, and then vacuum filtered using a Buchner funnel. The filtered lithium metal oxide was dried at a temperature of 200° C. to 300° C. for 24 hours, and dispersed using a 325-mesh sieve to obtain a desired lithium metal oxide.
experiment example 2
[0198] Manufacture of positive electrode active materials
[0199] In the examples and comparative examples using Li[Ni 0.83 co 0.11 mn 0.06 ]O 2 composed of lithium metal oxide particles. The thiosulfate additives listed in Table 3 below were mixed with deionized water (DIW) having a resistivity of 25 MΩcm or less to prepare a thiosulfate washing solution.
[0200] 50 g of lithium metal oxide particles were put into the first washing solution having the concentration shown in Table 3, stirred for 10 minutes, and vacuum filtered using a Buchner funnel to form active material lumps.
[0201] The second washing solution having the concentration shown in Table 3 was introduced into the active material block without additional stirring and mixing so as to penetrate through the active material block.
[0202] The mass of the active material washed twice with the thiosulfate washing solution was dried under vacuum at a temperature between 200° C. and 300° C. for 10 hours or m...
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Abstract
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