Lithium manganate particles for non-aqueous electrolyte secondary battery, process for producing the same, and nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-10056612-B2
Application number	US-201615147023-A
Country	US
Kind code	B2
Filing date	May 5, 2016
Priority date	Oct 1, 2008
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

This invention provides lithium manganate which has a high output and is excellent in high-temperature stability. This invention relates to lithium manganate particles which are produced by mixing a lithium compound, a manganese compound, a Y compound and an A compound and then calcining the resulting mixture, and have a composition represented by the following chemical formula 1 and an average secondary particle diameter (D 50 ) of 1 to 15 μm, in which Y is at least one element selected from the group consisting of Al and Mg; A is a sintering aid element having a melting point of not higher than 850° C.; x and y satisfy 0.03≤x≤0.15 and 0≤y≤0.20, respectively; z is in the range of 0 to 2.5 mol % based on Mn, wherein the lithium manganate particles have a sulfur content of not more than 100 ppm.

Li 1+x Mn 2-x-y Y y O 4 z A  (Chemical Formula 1)

First claim

The invention claimed is:

1. A process for producing lithium manganate particles having a composition represented by the following chemical formula 1:
Li 1+x Mn 2-x-y Y y O 4 +z A  (Chemical Formula 1)

in which Y is at least one element selected from the group consisting of Al and Mg; A is a sintering aid element having a melting point of not higher than 850° C.; x and y satisfy 0.03≤x≤0.15 and 0≤y≤0.20, respectively; z is in the range of 0 to 2.5 mol % based on Mn,
which lithium manganate particles have a sulfur content of 1 to 100 ppm and an average secondary particle diameter (D 50 ) of 1 to 15 μm, and have such properties that when measuring characteristics of a secondary battery produced by using the lithium manganate particles as a positive electrode active material, a high temperature cycle retention rate of the secondary battery is not less than 92%, and a capacity recovery rate of the secondary battery is not less than 95%,
the process comprising the steps of:
mixing manganese oxide formed of Mn 3 O 4 , a Y element compound and a lithium compound with each other; and
calcining the resulting mixture at a temperature of 910° C. to 1050° C.

2. The process for producing the lithium manganate particles according to claim 1 , wherein the manganese oxide has a sulfur content of 1 to 60 ppm.

3. The process for producing the lithium manganate particles according to claim 1 , wherein the manganese oxide has an average primary particle diameter of not less than 0.5 μm.

Assignees

• Toda Kogyo Corp

Inventors

• Koga Kazumichi
• Uegami Masayuki
• Masukuni Hiroaki
• Matsumoto Kazutoshi
• Ishizaki Kazutoshi
• Sadamura Hideaki

Classifications

• C01P2006/12

  Surface area · CPC title

• H01B1/08

  oxides · CPC title

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• C01P2002/52

  containing elements as dopants · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title