Active material, nonaqueous electrolyte battery, battery pack and battery module
摘要
說(shuō)明書(shū)
First, calcination was performed at a temperature of 650° C. for 6 hours in an air atmosphere. Next, a powder obtained by calcination was taken out from the furnace, and the powder was reground and mixed. When the calcination is previously performed as above to decompose the carbonates or the like in the materials and they are mixed again, the raw material particles can cohere to each other in a main sintering; as a result, particles which are uniform and have high crystallinity can be obtained.
The thus obtained mixture was subsequently subjected to a first-sintering at a temperature of 900° C. for 6 hours. After the sintering, the sintered powder was taken out from the furnace, and the sintered powder was mixed again.
Subsequently, the re-mixed sintered powder was put in the furnace, and a second sintering was performed at a temperature of 900° C. for 6 hours in an air atmosphere. After that, the temperature in the electric furnace was kept at 400° C. for 2 hours, and then was quickly cooled to room temperature. Next, the sintered powder was taken out from the furnace, and the sintered powder was mixed again. The powder obtained after the second sintering, i.e., as a result of sintering at a temperature of 900° C. for a total of 12 hours was used as each of products was used as each of products of Example A-1 to A-13.
In Example A-14, a product of Example A-14 was synthesized in the same manner as in Example A-5 except that the sintering was performed in a reduction atmosphere by blowing nitrogen gas containing 3% hydrogen into the electric furnace.
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