Method for manufacturing over-lithiated layered lithium metal composite oxide

Patent metadata

Field	Value
Publication number	US-9525173-B2
Application number	US-201415028036-A
Country	US
Kind code	B2
Filing date	Oct 9, 2014
Priority date	Oct 10, 2013
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

A positive electrode material for a lithium-ion cell, comprising an over-lithiated layered lithium metal composite oxide that provides the positive electrode material for a lithium-ion cell. Also, a method for manufacturing an over-lithiated layered lithium metal composite oxide represented by the general formula Li 1+x M 1−x O 2 , where x is 0.10 or more and 0.33 or less, and M includes Mn and at least one element selected from the group consisting of Ni, Co, Al, Mg, Ti, Fe and Nb, wherein the method includes a step of mixing a lithium metal composite oxide represented by the general formula Li 1+x M 1−x O 2 , where x is −0.15 to 0.15, and M includes Mn and at least one element selected from the group consisting of Ni, Co, Al, Mg, Ti, Fe and Nb, with a lithium compound to obtain a mixture and calcining the mixture to obtain the over-lithiated layered lithium metal composite oxide.

First claim

The invention claimed is:

1. A method for producing an over-lithiated layered lithium metal composite oxide represented by the general formula Li 1+x M 1−x O 2 , where x is 0.10 or more and 0.33 or less, and M comprises Mn and at least one element selected from the group consisting of Ni, Co, Al, Mg, Ti, Fe and Nb, the method comprising a step of mixing a lithium metal composite oxide represented by the general formula Li 1+x M 1−x O 2 , where x is −0.15 or more and 0.15 or less, and M comprises Mn and at least one element selected from the group consisting of Ni, Co, Al, Mg, Ti, Fe and Nb, with a lithium compound to obtain a mixture and calcining the mixture to thereby obtain the over-lithiated layered lithium metal composite oxide.

2. The method for producing an over-lithiated layered lithium metal composite oxide according to claim 1 , the method further comprising:
a first step of calcining a raw material composition containing raw materials of a “Li element” and “M elements” in the general formula Li 1+x M 1−x O 2 , where x is −0.15 or more and 0.15 or less, and M comprises Mn and at least one element selected from the group consisting of Ni, Co, Al, Mg, Ti, Fe and Nb, to thereby obtain a lithium metal composite oxide represented by the general formula Li 1+x M 1−x O 2 , where x is −0.15 or more and 0.15 or less, and M always Mn and at least one element selected from the group consisting of Ni, Co, Al, Mg, Ti, Fe and Nb; and
a second step of mixing and calcining the lithium metal composite oxide obtained in the first step with a lithium compound to thereby obtain the over-lithiated layered lithium metal composite oxide.

3. The method for producing an over-lithiated layered lithium metal composite oxide according to claim 1 , wherein the lithium metal composite oxide has a primary particle diameter of 0.7 μm or larger.

4. The method for producing an over-lithiated layered lithium metal composite oxide, according to claim 2 , wherein in the first step, the calcination is carried out once or twice or more.

5. The method for producing an over-lithiated layered lithium metal composite oxide according to claim 2 , wherein a calcining temperature in the second step is higher than a calcining temperature in the first step.

6. The method for producing an over-lithiated layered lithium metal composite oxide according to claim 2 , wherein the first step or the second step or both the steps are carried out once or twice or more.

7. The method for producing an over-lithiated layered lithium metal composite oxide according to claim 1 , wherein the lithium compound to be used is lithium hydroxide or lithium carbonate.

Assignees

• Mitsui Mining & Smelting Co

Inventors

• Kagei Shinya
• Takahashi Tsukasa
• Yamaguchi Kyohei
• Hata Yoshimi

Classifications

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• C01P2004/51

  Particles with a specific particle size distribution · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title