Cathode active material for secondary battery, method of manufacturing the same, and cathode for lithium secondary battery including the cathode active material

Patent metadata

Field	Value
Publication number	US-2017288206-A1
Application number	US-201715623929-A
Country	US
Kind code	A1
Filing date	Jun 15, 2017
Priority date	Sep 30, 2013
Publication date	Oct 5, 2017
Grant date	—

Abstract

The present invention relates to a cathode active material including a lithium-containing transition metal oxide and two or more metal composite oxide layers selected from the group consisting of Chemical Formulae 1 to 3 which are coated on the surface of the lithium-containing transition metal oxide, a method of manufacturing the same, and a cathode for a secondary battery including the cathode active material,
[Chemical Formula 1]
M(C 2 H 5 O 2 ) n
[Chemical Formula 2]
M(C 6 H (8-n) O 7 )
[Chemical Formula 3]
M(C 6 H (8-n) O 7 )(C 2 H 5 O 2 )
(where M, as a metal desorbed from a metal precursor, represents at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Y, Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ir, Ni, Zn, Al, Ga, In, Si, Ge, Sn, La, and Ce, and n is an integer between 1 and 4).

First claim

1 . A cathode active material comprising:
a lithium-containing transition metal oxide; and two or more metal composite oxide layers selected from the group consisting of Chemical Formulae 1 to 3 which are coated on a surface of the lithium-containing transition metal oxide: [Chemical Formula 1]
M(C 2 H 5 O 2 ) n
[Chemical Formula 2]
M(C 6 H (8-n) O 7 )
[Chemical Formula 3]
M(C 6 H (8-n) O 7 )(C 2 H 5 H 2 )

(where M, as a metal desorbed from a metal precursor, represents at least one metal selected from the group consisting of magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), yttrium (Y), titanium (Ti), zirconium (Zr), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), iron (Fe), cobalt (Co), iridium (Ir), nickel (Ni), zinc (Zn), aluminum (Al), gallium (Ga), indium (In), silicon (Si), germanium (Ge), tin (Sn), lanthanum (La), and cerium (Ce), and n is an integer between 1 and 4).

2 . The cathode active material of claim 1 , wherein the lithium-containing transition metal oxide comprises one selected from the group consisting of LiMO 2 (M═Co, Mn, Ni, Ni 1/3 Co 1/3 Mn 1/3 , Cr, or V), LiMO 4 (M═CoMn, NiV, CoV, CoP, FeP, MnP, NiP, or Mn 2 ), Li(Ni a Co b Mn c )O 2 (0<a<1, 0<b<1, 0<c<1, a+b+c=1), LiNi 1-y Co y O 2 , LiCo 1-y Mn y O 2 , LiNi 1- y Mn y O 2 (0<y<1), Li(Ni a Mn b CO c )O 4 (0<a<2, 0<b<2, 0<c<2, a+b+c=2), LiMn 2-z Ni z O 4 , LiMn 2-z Co z O 4 (0<z<2), and LiV 3 O 6 .

3 . The cathode active material of claim 1 , wherein the lithium-containing transition metal oxide is LiCoO 2 , LiNiO 2 , LiMnO 2 , LiCuO 2 , LiMn 2 O 4 , LiNi 1/3 Mn 1/3 Co 1/3 O 2 , LiNi 0.6 Mn 0.2 Co 0.2 O 2 , LiCoPO 4 , or LiFePO 4 .

4 . The cathode active material of claim 1 , wherein the two or more metal composite oxide layers are formed in a single layer structure, in which two or more metal composite oxides are uniformly mixed, or a multilayer structure having two or more layers in which two or more metal composite oxide layers are sequentially stacked.

5 . The cathode active material of claim 1 , wherein a total thickness of the two or more metal composite oxide layers is in a range of 5 nm to 500 nm.

6 . The cathode active material of claim 1 , wherein an amount of metal in the two or more metal composite oxide layers is in a range of 0.01 wt % to 10 wt % based on a total weight of the lithium-containing transition metal oxide.

7 . The cathode active material of claim 1 , wherein the two or more metal composite oxide layers comprise a composite oxide of at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Y, Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ir, Ni, Zn, Al, Ga, In, Si, Ge, Sn, La, and Ce.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Dong Kwon
• Cho Seung Beom
• Nho Jun Seok
• Jang Wook

Classifications

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/1391

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

• H01M4/62

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

• H01M4/0471

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