Positive electrode active material for lithium ion secondary batteries, method for producing positive electrode active material for lithium ion secondary batteries, and lithium ion secondary battery
A positive active material, secondary battery technology, applied in the direction of active material electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as thermal stability reduction, and achieve the effect of inhibiting oxygen release
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Embodiment 1
[0157] (1) Preparation of positive electrode active material
[0158] The general formula with Ni as the main component: Ni 0.90 co 0.07 Al 0.03 (OH) 2 The metal composite hydroxide shown was heat-treated at 600° C. for 5 hours in air (oxygen concentration: 21% by volume) airflow (heat treatment step). Thus, as a heat-treated metal complex compound, the general formula: Ni 0.90 co 0.07 Al 0.03 The metal composite oxide represented by O.
[0159] Next, Li / Me, which is the ratio of the number of atoms of lithium (Li) to the number of atoms of metals other than lithium (Me) in the resulting lithium mixture, was set to 1.01 for the metal composite oxide and lithium hydroxide obtained in the heat treatment step. The method was weighed and mixed sufficiently to obtain a lithium mixture (mixing process).
[0160] For mixing, a vibrating mixer device (Turbula Type T2C manufactured by Willy A. Bachofen (WAB)) was used.
[0161] The lithium mixture obtained in the mixing step w...
Embodiment 2
[0195] so that the specific surface area becomes 1.89m 2 / g, except that the firing temperature was set at 720° C., a positive electrode active material and a secondary battery were obtained and evaluated in the same manner as in Example 1. The results are shown in Table 1.
Embodiment 3
[0197] so that the specific surface area becomes 0.80m 2 / g, except that the firing temperature was set at 780° C., a positive electrode active material and a secondary battery were obtained and evaluated in the same manner as in Example 1. The results are shown in Table 1.
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