Positive electrode active material

摘要

A lithium ion secondary battery has a high cycle retention rate, and has its battery capacity increased. A positive electrode active material is used which includes a crystal phase having a structure formed by collecting a plurality of crystallites, and powder particles containing amorphous phases and formed between the crystallites. The amorphous phases and contain one or more kinds of metal oxides selected from the group consisting of vanadium oxide, iron oxide, manganese oxide, nickel oxide and cobalt oxide. The crystal phase and the amorphous phase and are capable of intercalation and deintercalation of lithium ions.

主权项

1. A positive electrode active material comprising:
a crystal phase formed of a plurality of crystallites; and an amorphous phase formed between the crystallites, wherein the amorphous phase contains one or more kinds of metal oxides selected from the group consisting of vanadium oxide, iron oxide, manganese oxide, nickel oxide and cobalt oxide, wherein the crystal phase and the amorphous phase are capable of intercalation and deintercalation of a lithium ion, and wherein the crystallites are selected from the group consisting of FeyV2O5 (y is a range of 0.26 to 0.41), LiADO4 (A is one kind of metal selected from Fe, Mn, Ni, and Co, and D is one kind of element selected from P or V), and Li2ASiO4 (A is one kind of metal selected from Fe, Mn, Ni, and Co).