Bronze-type titanium oxide compound containing potassium, method of manufacturing the same, and lithium-ion secondary battery using the same

摘要

In a titanium oxide compound according to the present invention, the titanium oxide compound is obtained by eluating potassium of potassium tetratitanate expressed by a general formula K2Ti4O9 and performing thermal processing, and, in an X-ray diffraction spectrum of the potassium tetratitanate obtained by using a Cu—Kα ray source, between a peak intensity Ia of a (200) plane, a peak intensity Ic of a (004) plane and a peak intensity Ib of a (31-3) plane, a relationship of Ia>Ib>Ic is satisfied.

主权项

1. A bronze-type titanium oxide in which potassium tetratitanate expressed by a general formula K2Ti4O9 is obtained by converting a mixture of a titanium compound and a potassium compound into potassium dititanate expressed by a general formula K2Ti2O5 by burning processing, then eluting a part of potassium ions of the potassium dititanate to change a composition thereof and thereafter performing thermal processing, and which is obtained by eluting potassium of the obtained potassium tetratitanate and performing thermal processing,
wherein, in an X-ray diffraction spectrum of the potassium tetratitanate obtained by using a Cu—Kα ray source, between a peak intensity Ia of a (200) plane, a peak intensity Ic of a (004) plane and a peak intensity Ib of a (31-3) plane, a relationship of Ia>Ib>Ic and a relationship of 5.0>Ia/Ic>2.0 are satisfied, and a concentration of potassium in the bronze-type titanium oxide is equal to or more than 0.1 mass percent but equal to or less than 2.0 mass percent.