Positive electrode active material for rechargable lithium battery, method for manufacturing same, and rechargable lithium battery including same

Patent metadata

Field	Value
Publication number	US-2018254473-A1
Application number	US-201515575427-A
Country	US
Kind code	A1
Filing date	Dec 22, 2015
Priority date	May 18, 2015
Publication date	Sep 6, 2018
Grant date	—

Abstract

Disclosed are a positive active material for a rechargeable lithium battery, a method of manufacturing the same, and a rechargeable lithium battery including the same. More specifically, the positive active material for a rechargeable lithium battery is a compound having an orthorhombic layered structure represented by the following Chemical Formula 1 or a compound represented by the following Chemical Formula 2, a method for producing the same, and a rechargeable lithium battery including the same.
Li 1+x M y O 2+z   [Chemical Formula 1]

{ m (Li 1+x M y O 2+z )}.{ 1-m (LiMO 2 )}  [Chemical Formula 2]
Wherein, in the above Chemical Formula 1 or Chemical Formula 2, M is one or more elements selected from the group consisting of Mn, Co, Ni, Al, Ti, Mo, V, Cr, Fe, Cu, Zr, Nb, and Ga, 0.7≤x≤1.2, 0.8≤y≤1.2, −0.2≤z≤0.2, and 0<m≤1.

First claim

1 . A positive active material compound having a layer structure represented by the following Chemical Formula 1:
Li 1+x M y O 2+z   [Chemical Formula 1]
wherein, in the above Chemical Formula 1, M is one or more elements selected from the group consisting of Mn, Co, Ni, Al, Ti, Mo, V, Cr, Fe, Cu, Zr, Nb, and Ga, 0.8≤x≤1.2, 0.8≤y≤1.2, and −0.2≤z≤0.2.

2 . The positive active material for a rechargeable lithium battery of claim 1 ,
wherein the layer structure is an orthorhombic layered structure.

3 . The positive active material for a rechargeable lithium battery of claim 1 ,
wherein, in the above Chemical Formula 1, 1≤x≤1.2.

4 . The positive active material for a rechargeable lithium battery of claim 1 ,
wherein, in the above Chemical Formula 1, 1≤y≤1.2.

5 . The positive active material for a rechargeable lithium battery of claim 1 ,
wherein, in the above Chemical Formula 1, M is Mn.

6 . A positive active material compound having a layer structure represented by the following Chemical Formula 2:
{ m (Li 1+x M y O 2+ )}.{ 1-m (LiMO 2 )}  [Chemical Formula 2]
wherein, in the above Chemical Formula 2, M is one or more elements selected from the group consisting of Mn, Co, Ni, Al, Ti, Mo, V, Cr, Fe, Cu, Zr, Nb, and Ga, 0.8≤x≤1.2, 0.8≤y≤1.2, −0.2≤z≤0.2, and 0<m≤1.

7 . The positive active material for a rechargeable lithium battery of claim 6 ,
wherein, in the above Chemical Formula 2, 1≤x≤1.2.

8 . The positive active material for a rechargeable lithium battery of claim 6 ,
wherein, in the above Chemical Formula 2, 1≤y≤1.2.

9 . The positive active material for a rechargeable lithium battery of claim 6 ,
wherein, in the above Chemical Formula 2, M is Mn.

10 . A method of manufacturing a positive active material for a rechargeable lithium battery, comprising:
preparing a Mixture 1 by mixing a compound represented by Chemical Formula 3 and a carbon-based material; and heat-treating the Mixture 1:
Li 1+x M y O 3+z   [Chemical Formula 3]

wherein, in the above Chemical Formula 3, M is one or more elements selected from the group consisting of Mn, Co, Ni, Al, Ti, Mo, V, Cr, Fe, Cu, Zr, Nb, and Ga, 0.8≤x≤1.2, 0.8≤y≤1.2, and −0.2≤z≤0.2.

11 . The method of claim 10 ,
wherein, in the above Mixture 1, the weight ratio of the compound represented by the above Chemical Formula 3 to carbon (C) in the above carbon-based material is 1:0.001 to 1:0.050.

12 . The method of claim 10 ,
wherein the step of heat-treating the Mixture 1 is performed at about 300 to about 1000° C.

13 . The method of claim 10 ,
wherein the step of heat-treating the Mixture 1 is performed for about 3 to about 40 hours.

14 . The method of claim 10 ,
wherein, by the step of heat-treating the Mixture 1, the compound represented by the above Chemical Formula 3 is reduced to obtain a compound having a layer structure represented by the following Chemical Formula 4:
Li 1+x M y O 2+z   [Chemical Formula 4]

wherein, in the above Chemical Formula 4, M is one or more elements selected from the group consisting of Mn, Co, Ni, Al, Ti, Mo, V, Cr, Fe, Cu, Zr, Nb, and Ga, 0.8≤x≤1.2, 0.8≤y≤1.2, and −0.2≤z≤0.2.

15 . The method of claim 14 , comprising:
preparing a Mixture 2 by mixing the compound having a layer structure represented by Chemical Formula 4 with a lithium metal compound; and heat-treating the Mixture 2 to obtain an over-lithiated positive active material after the above step of heat-treating the Mixture 1.

16 . The method of claim 15 ,
wherein the lithium metal compound is a compound having a layer structure represented by the following Chemical Formula 5:
LiMO 2   [Chemical Formula 5]

wherein, in the above Chemical Formula 5, M is one or more elements selected from the group consisting of Mn, Co, Ni, Al, Ti, Mo, V, Cr, Fe, Cu, Zr, Nb, and Ga.

17 . The method of claim 15 ,
wherein, in the Mixture 2, the weight ratio of the compound having a layer structure represented by the above Chemical Formula 4 to the above lithium metal compound is 1:0.001 to 0.001:1.

18 . The method of claim 15 ,
wherein the step of heat-treating the Mixture 2 to obtain an over-lithiated positive active material is performed at about 300 to about 1000° C.

19 . The method of claim 15 ,
wherein the step of heat-treating the Mixture 2 to obtain an over-lithiated positive active material is performed for about 3 to about 40 hours.

20 . The method of claim 15 ,
wherein, in the step of heat-treating the Mixture 2 to obtain an over-lithiated positive active material, a compound having a layer structure represented by the following Chemical Formula 6 is obtained as the above over-lithiated positive active material:
{ m (Li 1+x M y O 2+z )}.{1- m (LiMO 2 )}  [Chemical Formula 6]

wherein, in the above Chemical Formula 6, M is one or more elements selected from the group consisting of Mn, Co, Ni, Al, Ti, Mo, V, Cr, Fe, Cu, Zr, Nb, and Ga, 0.8≤x≤1.2, 0.8≤y≤1.2, −0.2≤z≤0.2, and 0<m≤1.

21 . (canceled)

Assignees

• Seoul Nat Univ R&Db Foundation

Inventors

• Lim Jin-Myoung
• Kim Duho
• Cho Maenghyo
• Cho Kyeong-Jae

Classifications

• H01M4/1391

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

• H01M4/131 Primary

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

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title