Positive electrode active material for nonaqueous electrolyte secondary battery, method for producing same, and nonaqueous electrolyte secondary battery
A positive active material, non-aqueous electrolyte technology, applied in the direction of active material electrodes, battery electrodes, positive electrodes, etc., can solve the problems of crystallinity evaluation, inability to obtain DCIR, and evaluation of insufficient crystal surface area, etc., to achieve high input Effect of output characteristics
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Embodiment 1
[0228] [Crystalization process]
[0229] First, add water and stir in the reaction tank (5L), and at the same time, after adjusting the temperature in the tank to 45°C, add 25% by mass of ammonia solution and 24% by mass of sodium hydroxide aqueous solution, and make the temperature in the tank The ammonia concentration was adjusted to be 10 g / L, and the pH at a liquid temperature of 25° C. was adjusted to be 11.6.
[0230] Next, prepare a mixed aqueous solution in which sulfates of Ni, Mn, Co, Mg and Ca are dissolved, and sodium tungstate (Na 2 WO 4 ) in aqueous solution. Among them, for the mixed aqueous solution, the concentration of all metal compounds (sulfates of Ni, Mn, Co, Mg and Ca) is 2mol / L, and contains Ni with a molar ratio of Ni:Mn:Co=1:1:1. , Mn and Co, and the content of Mg is adjusted to 30mg / L, and the content of Ca is adjusted to 20mg / L. In addition, the concentration of the aqueous solution in which sodium tungstate was dissolved was adjusted to 2 mol / L...
Embodiment 2～13、 comparative example 1～6
[0254] The conditions in the firing process were adjusted as shown in Table 1, except that, in the same manner as in Example 1, positive electrode active materials in Examples 2 to 13 and Comparative Examples 1 to 6 were obtained and evaluated. . In addition, also through the measurement that carries out based on X-ray diffractometer and ICP emission spectrometer, confirmed that these anode active materials that obtain in embodiment and comparative example are all made of general formula: Li 1.10 Ni 0.332 co 0.331 mn 0.332 W 0.005 o 2 Represented and composed of a single phase of lithium-nickel-manganese composite oxide having a hexagonal layered structure.
[0255] Moreover, using these positive electrode active materials, the secondary battery was comprised similarly to Example 1, and it evaluated. These results are shown in Table 2.
[0256] [Table 1]
[0257]
[0258] [Table 2]
[0259]
Embodiment 14～17、 comparative example 7～10
[0261] Conditions in the crystallization process, water washing process and heat treatment process are adjusted as shown in Table 3, except that, operate in the same manner as in Example 1 to obtain the positive electrode active materials of Examples 14-17 and Comparative Examples 7-10, and evaluate them. In addition, also through the measurement that carries out based on X-ray diffractometer and ICP emission spectrometer, confirmed that these anode active materials that obtain in embodiment and comparative example are all made of general formula: Li 1.10 Ni 0.332 co 0.331 mn 0.332 W 0.005 o 2 shown, and has a hexagonal layered structure of lithium nickel manganese composite oxide single-phase composition.
[0262] Moreover, using these positive electrode active materials, the secondary battery was comprised similarly to Example 1, and it evaluated. These results are shown in Table 4.
[0263] [table 3]
[0264]
[0265] [Table 4]
[0266]
[0267] (evaluate)
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