Lithium manganate particles for non-aqueous electrolyte secondary battery, process for producing the same, and nonaqueous electrolyte secondary battery
a secondary battery and lithium manganate technology, applied in the field of lithium manganate particles, can solve the problems of low environmental safety upon disposal of secondary batteries obtained therefrom, high production cost, and deterioration of charge/discharge cycle characteristics of secondary batteries, and achieve excellent high-temperature stability and high output.
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example 1
Production of Lithium Manganate Particles
[0074]Under a nitrogen flow, 0.5 mol of manganese sulfate was added to 3.5 mol of sodium hydroxide to prepare a reaction solution having a total volume of 1 L. Manganese hydroxide thus produced was aged at 90° C. for 1 hr. After completion of the aging, air was passed through the reaction solution to oxidize manganese hydroxide at 90° C., and the resulting product was washed with water and then dried, thereby obtaining manganese oxide particles.
[0075]The thus obtained manganese oxide particles were Mn3O4 and had a granular shape, an average primary particle diameter of 4.8 μm, a BET specific surface area of 0.6 m2 / g and a sulfur content of 8 ppm.
[0076]The above Mn3O4 particles, lithium carbonate and aluminum hydroxide were mixed with each other for 1 hr such that a ratio of Li:Mn:Al was 1.072:1.828:0.10, thereby obtaining a uniform mixture. The aluminum hydroxide used above had an average secondary particle diameter (D50) of 10 μm. Fifty gram...
example 2
[0079]The same procedure as defined in Example 1 was conducted except that the kind of manganese oxide used was changed, the Mn3O4 particles, lithium carbonate and aluminum hydroxide were mixed simultaneously with boric acid to prepare a composition as shown in Table 1, and further the calcination temperature was changed as shown in Table 1, thereby obtaining lithium manganate particles.
[0080]The production conditions used above are shown in Table 1, and various properties of the thus obtained lithium manganate particles are shown in Table 2.
[0081]The lithium manganate particles obtained in Example 2 were kneaded with a resin, and the particles in the resulting kneaded material were cut using a cross-section polisher. The condition of distribution of Mn and Al on a section of each of the thus cut particles was determined from the results of EPMA mapping thereof. As a result, it was confirmed that Al was also uniformly distributed over the section of each particle similarly to Mn.
examples 3 to 5
[0082]The same procedure as defined in Example 1 was conducted except that the kind of Y (Al, Mg), the amount of Y added, and calcination conditions, were changed variously, thereby obtaining lithium manganate particles.
[0083]The production conditions used above are shown in Table 1, and various properties of the thus obtained lithium manganate particles are shown in Table 2.
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