Nippon Chemical Industrial Co., Ltd.

Tomonao Naruhashi

Masahiro Kikuchi

Minoru Fukuchi

Hiroyuki Inaba

Natsuhiro Sano

Eri Furui

The positive electrode active substance for a lithium secondary battery includes a mixture of a lithium cobalt composite oxide particle and an inorganic fluoride particle. The method for producing a positive electrode active substance for a lithium secondary battery includes a first step of subjecting a lithium cobalt composite oxide particle and an inorganic fluoride particle to a mixing treatment to thereby obtain a mixture of the lithium cobalt composite oxide particle and the inorganic fluoride particle. The lithium secondary battery uses, as a positive electrode active substance, the positive electrode active substance for a lithium secondary battery of the present invention.

Positive electrode active substance for lithium secondary battery, method for producing the same and lithium secondary battery

A coated particle according to the present invention is a coated particle containing a conductive metal-coated particle having a metal film formed on a surface of a core material, the conductive metal-coated particle coated with an insulation layer containing a polymer, wherein the insulation layer has a phosphonium group. The insulation layer preferably contains an insulating fine particle and the fine particle has a phosphonium group on a surface thereof, or the insulation layer is preferably a film having a phosphonium group. In addition, the metal is preferably at least one selected from nickel, gold, nickel alloys, and gold alloys. The polymer constituting the insulation layer is preferably at least one polymerized product selected from styrenes, esters, and nitriles.

Coated particles and production method therefor

The present invention provides covered particles wherein insulating layers cover the surfaces of electroconductive particles, and the covered particles are excellent in the adhesion between the surfaces of the electroconductive particles and the insulating layers. The covered particles includes: electroconductive particles in which metal films are formed on the surfaces of core materials, and a triazole-based compound is disposed on the outer surfaces on the sides opposite to the core materials in the metal films; and insulating layers covering the electroconductive particles, and the insulating layers comprise a compound having phosphonium groups.

Covered particle

The positive electrode active substance for a lithium secondary battery includes a mixture of a titanium-containing lithium cobalt composite oxide particle and an inorganic fluoride particle. The method for producing a positive electrode active substance for a lithium secondary battery includes a first step of subjecting a titanium-containing lithium cobalt composite oxide particle and an inorganic fluoride particle to a mixing treatment to thereby obtain a mixture of the titanium-containing lithium cobalt composite oxide particle and the inorganic fluoride particle. The lithium secondary battery uses, as a positive electrode active substance, the positive electrode active substance for a lithium secondary battery of the present invention.

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Tokyo, Japan

Tomonao Naruhashi