Method for Manufacturing Over-Lithiated Layered Lithium Metal Composite Oxide

Patent metadata

Field	Value
Publication number	US-2016254539-A1
Application number	US-201415028036-A
Country	US
Kind code	A1
Filing date	Oct 9, 2014
Priority date	Oct 10, 2013
Publication date	Sep 1, 2016
Grant date	—

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

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

• H01M4/505 Primary

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

• Y02E60/10

  Energy storage using batteries · CPC title

• C01G45/1228 Primary

  of the type (MnO2)-, e.g. LiMnO2 or Li(MxMn1-x)O2 · CPC title

• C01G53/50

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