Cathode active material and lithium secondary battery comprising the same

Patent metadata

Field	Value
Publication number	US-2017331103-A1
Application number	US-201715663035-A
Country	US
Kind code	A1
Filing date	Jul 28, 2017
Priority date	Apr 17, 2012
Publication date	Nov 16, 2017
Grant date	—

Abstract

Disclosed is a cathode active material comprising a combination of lithium manganese composite oxide with a spinel structure represented by the following Formula 1 and a specific oxide represented by the following Formula 2, the cathode active material having a broad potential region at 3.0 to 4.8V upon initial charge:
Li x M y Mn 2-y O 4-z A Z   ( 1 )

wherein 0.9≦×≦1.2, 0<y<2, and 0≦z<0.2;
M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Ti and Bi; and
A is at least one monovalent or bivalent anion,
y′Li 2 M′O 3 .(1-y′)LiM″O 2-z′ A′ z′   ( 2 )

0<y′<1 and 0≦z′<0.2;
M′ is at least one element selected form the group consisting of Mn, Sn and Zr having an oxidation number of+4;
M″ is at least one element selected from the group consisting of Period I and II transition metals, including Ni, Mn and Co, which have a 6-coordination structure and are stable in a layered structure; and
A′ is at least one monovalent or bivalent anion.
Disclosed is also a secondary battery comprising the cathode active material.

First claim

1 . A device, which is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle or a power storage system, said device comprising a battery pack, which comprises a battery module, which comprises a secondary battery, said secondary battery comprising:
a cathode active material; and an anode material, wherein the cathode active material comprises a combination of lithium manganese composite oxide with a spinel structure represented by the following Formula 1 and a specific oxide represented by the following Formula 2, the cathode active material having a broad potential region (potential plateau) at 3.0 to 4.8V upon initial charge:
Li x M y Mn 2-y O 4-z A z   Formula 1

wherein 0.9≦x≦1.2, 0<y<2, and 0≦z<0.2; M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Ti and Bi; and A is at least one monovalent or bivalent anion,
y′Li 2 M′O 3 .(1-y′)LiM″O 2-z′ A′ z′ 0<y′<1 and 0≦z′<0.2;   Formula 2

M′ is at least one element selected form the group consisting of Mn, Sn and Zr having an oxidation number of+4; M” is at least one element selected from the group consisting of Period I and II transition metals, including Ni, Mn and Co, which have a 6-coordination structure and are stable in a layered structure; and A′ is at least one monovalent or bivalent anion, wherein the oxide of Formula 1 is comprised of secondary particles having a mean particle diameter (D50) of 2 to 30 μm, wherein the oxide of Formula 2 is a composite with a layered structure or a solid solution with a layered structure, wherein the oxide of Formula 1 is mixed with the oxide of Formula 2 in a weight ratio of 80:20 to 95:5, and wherein the anode active material is a lithium metal oxide represented by the following Formula 6:
Li a Ti b O 4   (6)

wherein 0.5≦a≦3 and 1≦b≦2.5.

2 . The device according to claim 1 , wherein the oxide of Formula 1 is represented by the following Formula 3:
Li x Ni y Mn 2-y O 4   (3)
wherein 0.9≦x≦1.2, and 0.4≦y≦0.5.

3 . The device according to claim 2 , wherein the oxide of Formula 3 is LiNi 0.5 Mn 1.5 O 4 or LiNi 0.4 Mn 1.6 O 4 .

4 . The device according to claim 1 , wherein the oxide of Formula 2 is represented by the following Formula 4:
z′Li 2 MnO 3 . (1-z′)LiM″O 2   (4)
wherein 0.5<z′<1, and M″ is at least one element selected from the group consisting of Period I and II transition metals, including Ni, Mn and Co, which have 6-coordination structure and are stable in a layered structure.

5 . The device according to claim 1 , wherein the oxide of Formula 1 is mixed with the oxide of Formula 2 in a weight ratio of 80:20 to 90:10.

6 . The device according to claim 1 , wherein the lithium metal oxide of Formula 6 is Li 1.33 Ti 1.67 O 4 or LiTi 2 O 4 .

7 . The device according to claim 1 , wherein the secondary battery is a lithium secondary battery.

8 . The device according to claim 1 , wherein M′ is Sn.

9 . The device according to claim 1 , wherein M′ is at least one element selected from the group consisting of Sn and Zr having an oxidation number of+4; and wherein M″ is at least one element selected from the group consisting of Period I and II transition metals, including Ni and Co, which have a 6-coordination structure and are stable in a layered structure.

10 . The device according to claim 1 , wherein 0<z<0.2.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Daehong
• Lee Minhee
• Lee Younkyoung

Classifications

• H01M4/131

  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

• H01M4/364 Primary

  as mixtures · CPC title

• H01M10/052

  Li-accumulators · 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