# US 2010/0167129 A1 · Method for modifying cathode material and lithium battery employing the cathode material

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- Number: US 2010/0167129 A1
- Document ID: US20100167129A1
- Status: Published application
- Kind: A1
- Application number: 12/635,904
- Filed: 2009-12-11
- Published: 2010-07-01
- Earliest claimed: 2008-12-31
- Assignees: Industrial Technology Research Institute
- Inventors: Hung-Chun WU; Chin-Shu CHENG; Jung-Mu HSU; Fu-Ming WANG; Chang-Rung YANG; Jing-Pin PAN; Ching-Yi SU; Tsung-Hsiung WANG
- Web page: https://patentgrep.com/patent/US20100167129A1

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/621: {Binders}
- H01M 4/622: {being polymers}
- H01M 4/623: {fluorinated polymers}
- H01M 4/624: {Electric conductive fillers}
- H01M 4/625: {Carbon or graphite}
- H01M 4/626: {Metals}
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 50/574: Devices or arrangements for the interruption of current
- H01M 50/581: in response to temperature
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y10T 29/49108: Electric battery cell making
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention provides a lithium battery, including: a cathode plate and an anode plate; a separator disposed between the cathode plate and the anode plate to define a reservoir region; and an electrolyte filled in the reservoir region. A thermal protective film is provided to cover a material of the cathode plate or the anode plate. When a battery temperature rises over an onset temperature of the thermal protective film, it undergoes a crosslinking reaction to inhibit thermal runaway. A method for fabricating the lithium ion battery is also provided.

## Claims

### Claim 1

A lithium battery, comprising
a cathode plate and an anode plate;
a separator disposed between the cathode plate and the anode plate to define a reservoir region; and
an electrolyte filled in the reservoir region,
wherein a thermal protective film is provided to cover a material of the cathode plate or the anode plate, and when a battery temperature rises over an onset temperature of the thermal protective film, the thermal protective film undergoes a crosslinking reaction to inhibit thermal runaway, thereby preventing combustion or an explosion of the lithium battery, wherein the onset temperature is between about 80° C. and 280° C.

### Claim 2 (depends on 1)

The lithium battery as claimed in claim 1, wherein the thermal protective film covers the material of the cathode plate, which comprises a lithium mixed metal oxide, a conductive additive and a binder.

### Claim 3 (depends on 2)

The lithium battery as claimed in claim 2, wherein the lithium mixed metal oxide comprises LiMnO2, LiMn2O4, LiCoO2, Li2Cr2O7, Li2CrO4, LiNiO2, LiFeO2, LiNixCO1-xO2 (0<x<1), LiMPO4 (M is a transition metal), LiMn0.5Ni0.5O2, LiNixCOyMnzO2 (x+y+z=1), LiNixCOyAlzO2 (x+y+z=1), LiMc0.5Mn1.5O4 (Mc is a bivalent metal), or combinations thereof.

### Claim 4 (depends on 2)

The lithium battery as claimed in claim 2, wherein the conductive additive comprises carbon black, graphite, acetylene black, nickel powder, aluminum powder, titanium powder, stainless steel powder or combinations thereof.

### Claim 5 (depends on 2)

The lithium battery as claimed in claim 2, wherein the binder comprises polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR), polyamide, melamine resin, or combinations thereof.

### Claim 6 (depends on 1)

The lithium battery as claimed in claim 1, wherein the thermal protective film comprises a nitrogen-containing polymer.

### Claim 7 (depends on 6)

The lithium battery as claimed in claim 6, wherein the nitrogen-containing polymer is a reaction product of (A) amines, amides, imides, maleimides or imines with (B) diones.

### Claim 8 (depends on 7)

The lithium battery as claimed in claim 7, wherein the diones (B) comprise barbituric acid, barbituric acid derivatives, acetylacetone, or acetylacetone derivatives.

### Claim 9 (depends on 8)

The lithium battery as claimed in claim 8, wherein the nitrogen-containing polymer is a reaction product of barbituric acid and a bismaleimide monomer.

### Claim 10 (depends on 1)

The lithium battery as claimed in claim 1, wherein the onset temperature is between about 100° C. and 220° C.

### Claim 11 (depends on 1)

The lithium battery as claimed in claim 1, wherein the onset temperature is between about 130° C. and 200° C.

### Claim 12 (depends on 1)

The lithium battery as claimed in claim 1, further comprising a sealant structure wrapped around the cathode plate, the anode plate, the separator, and the electrolyte.

### Claim 13 (depends on 1)

The lithium battery as claimed in claim 1, wherein the thermal protective film shows N-1s or S-1s signals when analyzed by an X-ray photoelectron spectroscopy (XPS).

### Claim 14 (depends on 1)

The lithium battery as claimed in claim 1, wherein the thermal protective film has a thickness of not less than 25 nm.

### Claim 15 (depends on 1)

The lithium battery as claimed in claim 1, wherein a ratio of peak areas of transition metal 2p signal of the thermal protective film at 5 minutes to 0 minutes is greater than 6 according to an X-ray photoelectron spectroscopy (XPS) analysis.

### Claim 16

A method for fabricating a lithium battery, comprising providing an electrode material powder;
modifying the electrode material powder with a nitrogen-containing polymer to form a modified electrode material powder;
forming a modified electrode plate comprising the modified electrode material powder, a conductive additive and a binder, wherein the nitrogen-containing polymer covers the modified electrode material powder;
forming a lithium battery comprising the modified electrode plate; and
activating the lithium battery by a charging operation to form a thermal protective film in the modified electrode plate.

### Claim 17 (depends on 16)

The method as claimed in claim 16, wherein the electrode material powder is a lithium mixed metal oxide comprising LiMnO2, LiMn2O4, LiCoO2, Li2Cr2O7, Li2CrO4, LiNiO2, LiFeO2, LiNiCO1-xO2 (0<x<1), LiMPO4 (M is a transition metal), LiMn0.5Ni0.5O2, LiNixOyMnzO2 (x+y+z=1), LiNixOyAlzO2 (x+y+z=1), LiMc0.5Mn1.5O4 (Mc is a bivalent metal), or combinations thereof.

### Claim 18 (depends on 17)

The method as claimed in claim 17, wherein the modifying comprises modifying the lithium mixed metal oxide powder with a solution of the nitrogen-containing polymer having a solid content of about 1-20%.

### Claim 19 (depends on 16)

The method as claimed in claim 16, wherein the nitrogen-containing polymer is a reaction product of (A) amines, amides, imides, maleimides or imines with (B) diones.

### Claim 20 (depends on 16)

The method as claimed in claim 16, wherein the diones (B) comprise barbituric acid, barbituric acid derivatives, acetylacetone, or acetylacetone derivatives.

### Claim 21 (depends on 20)

The method as claimed in claim 20, wherein the nitrogen-containing polymer is a reaction product of barbituric acid and a bismaleimide monomer.

### Claim 22 (depends on 16)

The method as claimed in claim 16, wherein a weight ratio of the modified electrode material powder, the conductive additive, the binder in the modified electrode plate is about 80-93:0.1-5:0.1-5.

### Claim 23 (depends on 16)

The method as claimed in claim 16, wherein the conductive additive comprises carbon black, graphite, acetylene black, nickel powder, aluminum powder, titanium powder, stainless steel powder or combinations thereof.

### Claim 24 (depends on 16)

The method as claimed in claim 16, wherein the binder comprises polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR), polyamide, melamine resin, or combinations thereof.

### Claim 25 (depends on 16)

The method as claimed in claim 16, wherein the thermal protective film has an onset temperature of about 80° C. and 280° C.

### Claim 26 (depends on 16)

The method as claimed in claim 16, wherein the thermal protective film shows an N-1s or S-1s signal according to an X-ray photoelectron spectroscopy (XPS) analysis.

### Claim 27 (depends on 16)

The method as claimed in claim 16, wherein the thermal protective film has a thickness of not less than 25 nm.

### Claim 28 (depends on 16)

The method as claimed in claim 16, wherein a ratio of peak areas of transition metal 2p signal of the thermal protective film at 5 minutes to 0 minutes is greater than 6 according to an X-ray photoelectron spectroscopy (XPS) analysis.