Positive electrode active material for electrical devices, positive electrode for electrical devices, and electrical devices

Abstract

The positive electrode active material for electrical devices has a first active material and a second active material. The first active material is obtained by formula (1), that is, Li1.5[NiaCobMnc[Li]d]O3 (in formula (1), a, b, c and d satisfy 0<d<0.5, a+b+c+d=1.5, 1.0< a + b + c < 1.5 relationship) represented by the transition metal oxide composition. The second active material is represented by the formula (2), namely, LiMaˊMn2-aˊO4 (in the formula (2), M represents at least one metal element with an atomic valence of 2 to 4, and aˊ satisfies the relationship of 0≤aˊ<2.0), and The crystal structure belongs to the spinel type transition metal oxide of the space group Fd-3m. Moreover, the content ratio of the first active substance and the second active substance satisfies the formula (3) in terms of mass ratio, that is, 100:0<MA:MB<0:100 (in the formula (3), MA represents the mass ratio of the first active substance Mass, MB represents the mass of the second active substance) represents the relationship.

Description

technical field [0001] The invention relates to positive electrode active materials, positive electrodes for electric devices and electric devices. Specifically, the positive electrode active material of the present invention is generally suitably used as a positive electrode active material of lithium ion secondary batteries and lithium ion capacitors of electric devices. In addition, the electrical device of the present invention is suitably used as an electrical device for vehicles such as electric vehicles, fuel cell vehicles, and hybrid electric vehicles. Background technique [0002] In recent years, in order to cope with air pollution and global warming, it is urgent to reduce carbon dioxide emissions. In the automotive industry, attention is expected to be paid to the reduction of carbon dioxide emissions achieved by the introduction of electric vehicles (EV) and hybrid electric vehicles (HEV). Therefore, development of electric devices such as secondary batteries ...

AI Technical Summary

Problems solved by technology

However, with Li [Li x Ni y mn ｚ 〕O 2－a The crystal structure of the lithium-nickel-manganese composite oxide shown cannot be stabilized, and there is a problem that a high capacity cannot be maintained.

[0010] In addition, in the studies of the present inventors, even a lithium ion storage battery using the cathode composition for a lithium ion storage battery described in Patent Document 2 has problems such as insufficient discharge capacity, discharge operating voltage, and initial rate characteristics.

Images