# US 2014/0154552 A1 · Rechargeable lithium battery and a method of making a rechargeable lithium battery

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- Number: US 2014/0154552 A1
- Document ID: US20140154552A1
- Status: Published application
- Kind: A1
- Application number: 14/051,302
- Filed: 2013-10-10
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Chong-Gi HONG; Joon-Hyung LEE
- Web page: https://patentgrep.com/patent/US20140154552A1

## CPC

- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 50/417: Polyolefins
- H01M 50/423: Polyamide resins
- H01M 50/434: Ceramics
- H01M 50/449: having a layered structure
- H01M 50/491: Porosity
- H01M 10/052: Li-accumulators
- H01M 50/403: Manufacturing processes of separators, membranes or diaphragms
- H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y10T 29/49115: including coating or impregnating
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided is a rechargeable lithium battery that includes a positive electrode including a positive active material; a negative electrode including a negative active material; a separator interposed between the positive electrode and the negative electrode; and an electrolyte solution, wherein the positive active material includes lithium metal oxide and a compound represented by the following Chemical Formula 1 and coated on a surface of the lithium metal oxide, and the separator includes a porous substrate and a coating layer including ceramic and disposed on at least one side of the porous substrate. Li1+xAlxM2−x(PO4)3 [Chemical Formula 1] In Chemical Formula 1, M is at least one metal selected from Ti, Cr, Ga, Fe, Sc, In, Y, Mg, and Si, and 0<x≦0.7.

## Claims

### Claim 1

A rechargeable lithium battery comprising:
a positive electrode comprising a positive active material;
a negative electrode comprising a negative active material;
a separator interposed between the positive electrode and the negative electrode, the separator comprising a porous substrate and a coating layer comprising a ceramic material disposed on at least one side of the porous substrate; and
an electrolyte solution,
wherein the positive active material comprises a lithium metal oxide, and a compound represented by the following Chemical Formula 1 on the surface of the lithium metal oxide:
Li1+xAlxM2−x(PO4)3 Chemical Formula 1
wherein M is at least one selected from Ti, Cr, Ga, Fe, Sc, In, Y, Mg, and Si, and 0<x≦0.7.

### Claim 2 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the coating layer is formed on one side or both sides of the porous substrate.

### Claim 3 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the coating layer has a thickness of from about 1 μm to about 10 μm.

### Claim 4 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the coating layer has a porosity of from about 30 volume % to about 55 volume %.

### Claim 5 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the coating layer further comprises a heat-resistance resin selected from the group consisting of an aramid resin, a polyamideimide resin, a polyimide resin, or a combination thereof.

### Claim 6 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the porous substrate comprises a polyolefin resin.

### Claim 7 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the ceramic material comprises Al2O3, MgO, TiO2, Al(OH)3, Mg(OH)2, Ti(OH)4, or a combination thereof.

### Claim 8 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the ceramic material has an average particle diameter of from about 50 μm to about 500 μm.

### Claim 9 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the lithium metal oxide comprises at least one of Co, Mn, Ni and Al.

### Claim 10 (depends on 1)

The rechargeable lithium battery of claim 1, wherein M is Ti.

### Claim 11 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the compound represented by Chemical Formula 1 is Li1+xAlxTi2−x(PO4)3 and 0.1<x≦0.5.

### Claim 12 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the compound represented by Chemical Formula 1 is coated on the lithium metal oxide.

### Claim 13 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the compound represented by Chemical Formula 1 is formed non-continuously on the lithium metal oxide.

### Claim 14 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the compound represented by Chemical Formula 1 is included in an amount of about 1 wt % to about 3 wt % based on the total amount of the positive active material.

### Claim 15 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the compound represented by Chemical Formula 1 is included in an amount of about 1.5 wt % to about 2.5 wt % based on the total amount of the positive active material.

### Claim 16 (depends on 1)

The rechargeable lithium battery of claim 1, wherein the operation voltage of the rechargeable lithium battery is about 4.3V or higher.

### Claim 17

A method of making a rechargeable lithium battery comprising:
mixing a Li raw material, an Al raw material, an M raw material and a PO4 raw material in a predetermined ratio to prepare a first product;
heating the first product to obtain a second product;
pulverizing the second product to obtain a third product;
heating the third product to obtain a fourth product;
pulverizing the fourth product to obtain a fifth product;
precipitating the fifth product to obtain a sixth product;
mixing the sixth product with a lithium metal oxide to obtain a seventh product; and heating the seventh product to obtain a positive active material;
coating the positive active material on a positive collector preparing a positive electrode;
providing a separator comprising a porous substrate and a coating layer comprising a ceramic material disposed on at least one side of the porous substrate;
combining a negative electrode with the positive electrode and the separator,
wherein the separator is disposed between the positive electrode and the negative electrode, and
wherein M is at least one selected from Ti, Cr, Ga, Fe, Sc, In, Y, Mg, and Si.

### Claim 18 (depends on 17)

The method of claim 17, wherein M is Ti.

### Claim 19 (depends on 17)

The method of claim 17, wherein the mixing comprises ball milling.

### Claim 20 (depends on 17)

The method of claim 17, wherein the lithium metal oxide comprises at least one of Co, Mn, Ni and Al.