High Voltage Positive Electrode Active Material Including Lithium Manganese-Based Oxide and Method for Producing the Same

Patent metadata

Field	Value
Publication number	US-2020020942-A1
Application number	US-201816494503-A
Country	US
Kind code	A1
Filing date	Sep 7, 2018
Priority date	Sep 26, 2017
Publication date	Jan 16, 2020
Grant date	—

Abstract

A positive electrode active material contains a lithium-rich lithium manganese-based oxide, wherein the lithium manganese-based oxide has a composition of the following chemical formula (1), and wherein a lithium ion conductive glass-ceramic solid electrolyte layer containing at least one selected from the group consisting of thio-LISICON(thio-lithium super ionic conductor), LISICON(lithium super ionic conductor), Li 2 S—SiS 2 —Li 4 SiO 4 , and Li 2 S—SiS 2 —P 2 S 5 —Lil is formed on the surface of the lithium manganese-based oxide particle:
Li 1−x M y Mn 1−x−y O 2−z Q z   (1)
wherein, 0<x≤0.2, 0<y≤0.2, and 0≤z≤0.5; M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Ga, In, Ru, Zn, Zr, Nb, Sn, Mo, Sr, Sb, W, Ti and Bi; and Q is at least one element selected from the group consisting of P, N, F, S and Cl.

First claim

1 . A positive electrode active material comprising:
lithium-rich lithium manganese-based oxide, in a form of a particle, and a lithium ion conductive glass-ceramic solid electrolyte layer formed on a surface of the particle, wherein the lithium manganese-based oxide has a composition of the following chemical formula (1),
Li 1+x M y Mn 1−x−y O 2−z Q z   (1)

wherein, 0<x≤0.2, 0<y≤0.2, and 0≤z≤0.5; M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Ga, In, Ru, Zn, Zr, Nb, Sn, Mo, Sr, Sb, W, Ti and Bi; and Q is at least one element selected from the group consisting of P, N, F, S and Cl, and wherein the lithium ion conductive glass-ceramic solid electrolyte layer contains thio-LISICON(thio-lithium super ionic conductor), LISICON(lithium super ionic conductor), Li 2 S—SiS 2 —Li 4 SiO 4 or Li 2 S—SiS 2 —P 2 S 5 —Lil.

2 . The positive electrode active material according to claim 1 , wherein the lithium manganese-based oxide has a composition of the following chemical formula (2)
Li 1+x Ni a Co b Mn 1−x−a−b O 2   (2)
wherein, 0<x≤0.2, 0≤a≤0.2, 0≤b≤0.2, and 0<a+b≤0.2.

3 . The positive electrode active material according to claim 1 , wherein the thio-LISICON is a material represented by Li 1+x+y (Al, Ga) x (Ti, Ge) 2−x Si y P 3−y S 12 , wherein, 0≤x≤1, and 0≤y≤1, and the LISICON is a material represented by Li 1+x+y (Al, Ga) x (Ti, Ge) 2−x Si y P 3−y O 12 , wherein, 0≤x≤1, and 0≤y≤1.

4 . The positive electrode active material according to claim 1 , wherein the lithium ion conductive glass-ceramic solid electrolyte layer includes LISICON of Li 1+x+y (Al, Ga) x (Ti, Ge) 2−x Si y P 3−y O 12 , wherein, 0≤x≤1, and 0≤y≤1.

5 . The positive electrode active material according to claim 1 , wherein an ionic conductivity of the lithium ion conductive glass-ceramic solid electrolyte layer is 1×10 −4 S·cm −1 or more at room temperature.

6 . The positive electrode active material according to claim 5 , wherein the ionic conductivity of the lithium ion conductive glass-ceramic solid electrolyte layer is 1×10 −2 S·cm −1 to 1×10 −3 S·cm −1 at room temperature.

7 . The positive electrode active material according to claim 1 , wherein a content of the lithium ion conductive glass-ceramic solid electrolyte layer is 0.1 to 10% by weight, based on a total weight of the lithium manganese-based oxide.

8 . The positive electrode active material according to claim 1 , wherein the lithium ion conductive glass-ceramic solid electrolyte layer further includes a conductive agent.

9 . A method for producing a positive electrode active material of claim 1 comprising:
(a) mixing a lithium-rich lithium manganese-based oxide powder and a lithium ion conductive glass-ceramic solid electrolyte powder containing thio-LISICON(thio-lithium super ionic conductor), LISICON(lithium super ionic conductor), Li 2 S—SiS 2 —Li 4 SiO 4 , or Li 2 S—SiS 2 —P 2 S 5 —Lil to form a mixture; and
(b) heat-treating the mixture.

10 . The method for producing a positive electrode active material according to claim 9 , wherein a mixing ratio of the lithium-rich lithium manganese-based oxide powder and the lithium ion conductive glass-ceramics solid electrolyte powder is 0.1 to 10% by weight based on a total weight of the lithium-rich lithium manganese-based oxide powder.

11 . The method for producing a positive electrode active material according to claim 9 , wherein the heat treating is performed at 300 to 800 degrees Celsius.

12 . A method for producing a positive electrode active material according to claim 1 comprising:
(i) mixing a lithium-rich lithium manganese-based oxide powder and a solid electrolyte precursor to form a mixture; and
(ii) heat-treating the mixture.

13 . The method for producing a positive electrode active material according to claim 12 , wherein a lithium compound is present on a surface of the lithium-rich lithium manganese-based oxide powder.

14 . The method for producing a positive electrode active material according to claim 13 , wherein the lithium compound is at least one selected from the group consisting of LiOH, Li 2 CO 3 , and Li 3 PO 4 .

15 . The method for producing a positive electrode active material according to claim 12 , wherein the solid electrolyte precursor is an inorganic material including Li 2 O, Al 2 O 3 , Ga 2 O, Ga 2 O 3 , SiO 2 , P 2 O 5 , TiO 2 , GeO 2 , Li 2 S, Al 2 S 3 , GaS or Ga 2 S 3 , SiS 2 , P 2 S 5 , TiS or GeS 2 .

16 . The method for producing a positive electrode active material according to claim 12 , wherein the heat treating is performed at 300 to 800 degrees Celsius.

17 . A positive electrode comprising a positive electrode mixture comprising the positive electrode active material according to claim 1 formed on at least one side of a current collector.

18 . A secondary battery comprising the positive electrode according to claim 17 .

Assignees

• Lg Chemical Ltd

Inventors

• Han Gi Beom
• Hwang Jintae
• Jung Wang Mo
• You Min Kyu
• Jo Chi Ho
• Park Sungbin
• Ju Inseong
• Hur Hyuck
• Park Younguk
• Yoo Tae Gu

Classifications

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · 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

• H01M10/0525

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

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M10/052

  Li-accumulators · CPC title