Positive electrode active material and secondary battery comprising the same
a positive electrode active material and secondary battery technology, applied in the direction of positive electrodes, cell components, cell components, etc., can solve the problems of poor thermal properties, low reserve of co, poor thermal properties, etc., and achieve excellent lifetime characteristics and charge/discharge characteristics, excellent capacity characteristics, and improved thermal stability
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examples 1
Example 1-1
[0252]In order to prepare a compound, wherein the Ni concentration is continuously decreased from the core to the surface, the Co and the Mn concentrations are continuously increased, a 2.4 M metal aqueous solution, prepared by mixing nickel sulfate and cobalt sulfate at the molar ratio of 80:20, as a metal salt aqueous solution for forming the core and a metal aqueous solution containing nickel sulfate, cobalt sulfate and manganese sulfate at the molar ratio of 55:15:30 as a metal salt aqueous solution for forming the surface part were prepared.
[0253]Distilled water 4 L was put into a coprecipitation reactor (Capacity: 4 L, power of a rotation motor: 80 W); nitrogen gas was supplied to the reactor at the speed of 0.5 L / min so as to remove dissolved oxygen; and stirred at 1000 rpm while maintaining the temperature of the reactor at 50° C.
[0254]The metal salt aqueous solution for forming the core and the metal salt aqueous solution for forming the surface part were mixed a...
example 1-2 to example 1-5
[0256]The procedure of Example 1-1 was repeated except for mixing nickel sulfate, cobalt sulfate and manganese sulfate of the metal salt aqueous solution for forming the core and the metal salt aqueous solution for forming the surface part at the molar ratio as listed in the following Table 1 so as to obtain an active material particle.
example 1-6
[0257]A cathode active material, which has the same composition with Examples 1-1 was prepared by using a batch reactor.
[0258]Distilled water 2.5 L was put into a coprecipitation batch reactor (Capacity: 8 L, power of a rotation motor: 180 W); nitrogen gas was supplied to the reactor at the speed of 0.6 L / min so as to remove dissolved oxygen; and stirred at 450 rpm while maintaining the temperature of the reactor at 50° C.
[0259]The metal salt aqueous solution for forming the core and the metal salt aqueous solution for forming the surface part having the same concentration with Example 1-3 were mixed at a certain ratio, and simultaneously supplied into the reactor at the rate of 0.2 L / hour. Further, 4.8 M ammonia solution was continuously supplied into the reactor at the rate of 0.1 L / hour. Further, for adjusting pH, 10 M NaOH aqueous solution was supplied to maintain pH in the reactor at 11. Then, the impeller speed of the reactor was controlled to 450 rpm, and the reaction solutio...
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