Spinel-type lithium cobalt manganese-containing complex oxide

Patent metadata

Field	Value
Publication number	US-9786914-B2
Application number	US-201415100354-A
Country	US
Kind code	B2
Filing date	Dec 4, 2014
Priority date	Dec 4, 2013
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

There is provided a Co-based 5-V spinel-type lithium manganese-containing complex oxide not only having an operating potential of 4.5 V or higher but also being capable of extending its capacity region of a 5.5 to 5.5 V region and being capable of enhancing its energy density as well. There is proposed a spinel-type lithium cobalt manganese-containing complex oxide having a crystal structure classified as a space group Fd-3m and being represented by the general formula [Li x (Co y Mn 3−x−y )O 4−δ] (wherein 0.90≦x≦1.15 and 0.75≦y≦1.25), wherein the oxide has a crystallite size measured by a Rietveld method using the fundamental method of 100 nm to 200 nm, an interatomic distance of Li—O of 1.80 Å to 2.00 Å, and a strain of 0.20 to 0.50.

First claim

The invention claimed is:

1. A spinel-type lithium cobalt manganese-containing complex oxide, having a crystal structure classified as a space group Fd-3m and being represented by a general formula [Li x (Co y M z Mn 3−x−y−z )O 4−δ ], wherein 0.90≦x≦1.15, 0.90≦y 1.25 and 0<z≦0.3, wherein M is Ni or a combination of Ni with one or two or more elements selected from the group consisting of Mg, Ti, Al, Ba, Cr, Fe, Mo, W, Zr, Y and Nb, and wherein 0≦δ<4 wherein the spinel-type lithium cobalt manganese-containing complex oxide has a crystallite size measured by a Rietveld method using a fundamental method of 100 nm to 200 nm, an interatomic distance of Li—O of 1.80 Å to 2.00 Å, and a strain of 0.20 to 0.50, and wherein the spinel-type lithium cobalt manganese-containing complex oxide has an operating potential of 4.5 V or higher at a metal Li reference potential.

2. A lithium secondary cell, comprising a spinel-type lithium cobalt manganese-containing complex oxide according to claim 1 as a positive electrode active substance thereof.

Assignees

• Mitsui Mining & Smelting Co

Inventors

• Yamaguchi Kyohei
• Ito Natsumi
• Takahashi Tsukasa
• Mitsumoto Tetsuya
• Kagei Shinya
• Hata Yoshimi

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C01G51/54 Primary

  of the type (Mn2O4)-, e.g. Li(CoxMn2-x)O4 or Li(MyCoxMn2-x-y)O4 · CPC title

• C01P2006/40

  Electric properties · CPC title