Positive electrode active material for lithium-ion secondary cell
A positive electrode active material and secondary battery technology, which is applied in the direction of secondary batteries, active material electrodes, battery electrodes, etc., can solve the problems that it is difficult to obtain recycling characteristics, and it is difficult to suppress the reduction of average discharge voltage, and achieve excellent cycle characteristics, Excellent cycle characteristics
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[0124] The preparation of the composition (1) is preferably carried out while heating the mixture of the compound (α) and the medium as necessary. As heating temperature at the time of preparation of composition (1), it is preferable that it is 40-80 degreeC, and it is more preferable that it is 50-70 degreeC. The compound (α) is easily dissolved in the medium by heating, and a stable solution is easily obtained.
[0125] As the composition (1), it is only necessary that the compound (α) is dissolved or dispersed in the medium, and an aqueous solution is particularly preferable from the viewpoint of easy uniform mixing of the particles (1) and the composition (1).
[0126] Examples of the compound (β) include inorganic salts such as nitrates, sulfates, and chlorides of the element (X), organic salts such as lactates, acetates, citrates, and formates, or organic complexes.
[0127] Among these, nitrates, lactates, acetates, and citric acid are preferred because they have high ...
Embodiment 1
[0180] Al 2 o 3 2.98 g of distilled water was added to 7.02 g of basic aluminum lactate aqueous solution (5.97 mass %) as composition (1) in conversion of 8.5 mass % of aluminum lactate aqueous solutions. Next, 9.63 g of distilled water was added to 0.37 g of yttrium (III) nitrate hexahydrate to prepare an aqueous yttrium nitrate solution (1.09% by mass) as a composition (2).
[0181] With respect to 10 g of the lithium-containing composite oxide (A), 1.0 g of an aluminum lactate aqueous solution was sprayed while stirring the lithium-containing composite oxide (A). Next, while stirring the lithium-containing composite oxide (A), 0.6 g of an aqueous yttrium nitrate solution was spray-coated to obtain coated particles of the lithium-containing composite oxide (A).
[0182] Next, the obtained coated particles were dried at 90° C. for 2 hours, and then heated at 400° C. for 8 hours in an oxygen-containing atmosphere to obtain a positive electrode active material (A).
Embodiment 2
[0186] The positive electrode active material (B) was obtained in the same manner as in Example 1 except that the amount of the aqueous yttrium nitrate solution sprayed on the surface of the lithium-containing composite oxide (A) was changed from 0.6 g to 1.2 g.
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