# US 9,437,896 B2 · Method of preparing lithium secondary battery

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,437,896 B2
- Document ID: US9437896B2
- Status: Granted
- Kind: B2
- Application number: 13/758,932
- Filed: 2013-02-04
- Published: 2013-08-08
- Granted: 2016-09-06
- Earliest claimed: 2012-02-07
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Keun-Won Song; Duck-Chul Hwang; Yong-Beom Lee; Jeong-Ki Ha
- Web page: https://patentgrep.com/patent/US9437896B2

## CPC

- H01M 10/058: Construction or manufacture
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- H01M 50/449: having a layered structure
- H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M 4/622: {being polymers}
- 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

A method of preparing a lithium secondary battery is disclosed, the method including coating a coating layer-forming composition including an inorganic compound and an organic/inorganic bindable silane compound having a first reactive functional group on a substrate to form a separator including a coating layer; preparing an electrode including an active material and a binder having a second reactive functional group; stacking the electrode to contact the coating layer of the separator, and adding an electrolyte to the electrode and separator to prepare a lithium secondary battery; and heat-treating the lithium secondary battery to react the first reactive functional group with the second reactive functional group and form a chemical bond.

## Claims

### Claim 1

A method of manufacturing a lithium secondary battery, the method comprising:
coating a coating layer-forming composition comprising an inorganic compound and an organic/inorganic bindable silane compound having a first reactive functional group on a substrate to form a separator comprising a coating layer;
preparing an electrode comprising an active material and a binder having a second reactive functional group;
stacking the electrode to contact the coating layer of the separator, and adding an electrolyte to the electrode and the separator to prepare a lithium secondary battery; and
heat-treating the lithium secondary battery to react the first reactive functional group with the second reactive functional group to form a chemical bond,
wherein the heat-treating is performed at a temperature in a range of about 80° C. to about 110° C., and
wherein the heat-treating is performed for a time period in a range of about 30 seconds to about 150 seconds.

### Claim 2 (depends on 1)

The method of claim 1, wherein the heat-treating comprises a hot-press process.

### Claim 3 (depends on 2)

The method of claim 2, wherein the hot-press process is performed by applying a force in a range of about 100 Kgf/cm2 to about 300 Kgf/cm2.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first reactive functional group is selected from the group consisting of amino groups, isocyanate groups, epoxy groups, mercapto groups, and combinations thereof.

### Claim 5 (depends on 1)

The method of claim 1, wherein the organic/inorganic bindable silane compound having the first reactive functional group is selected from the group consisting of epoxyalkylalkoxysilanes, aminoalkylalkoxysilanes, isocyanato alkylalkoxysilanes, mercapto alkylalkoxysilanes, and combinations thereof.

### Claim 6 (depends on 1)

The method of claim 1, wherein the organic/inorganic bindable silane compound having the first reactive functional group is selected from the group consisting of vinylalkylalkoxysilanes, halogenated alkylalkoxysilanes, vinylhalosilanes, alkylalkoxysilanes, and combinations thereof, and
wherein the vinyl alkylalkoxysilanes, halogenated alkylalkoxysilanes, vinylhalosilanes, alkylalkoxysilanes, and combinations thereof comprise the first reactive functional group selected from the group consisting of amino groups, isocyanate groups, epoxy groups, mercapto groups, and combinations thereof.

### Claim 7 (depends on 1)

The method of claim 1, wherein the inorganic compound comprises at least one selected from the group consisting of SrTiO3, SnO2, CeO2, MgO, NiO, CaO, ZnO, ZrO2, Y2O3, Al2O3, TiO2, BaTiO3, SiO2, and combinations thereof.

### Claim 8 (depends on 1)

The method of claim 1, wherein the coating layer-forming composition further comprises a polymer selected from the group consisting of polyvinylidenefluoride (PVdF), poly(vinylidene-hexafluoropropylene) (P(VdF-HFP)), polyethyleneoxide (PEO), polyacrylonitrile (PAN), polyimide (PI), polyamic acid (PAA), polyamideimide (PAI), aramid, polyvinylacetate (PVA), polymethylmethacrylate (PMMA), polyvinylether (PVE), and combinations thereof.

### Claim 9 (depends on 1)

The method of claim 1, wherein the substrate is a porous substrate selected from the group consisting of glass fiber, polyester, tetrafluoroethylene, polyolefin, polytetrafluoroethylene (PTFE), and combinations thereof.

### Claim 10 (depends on 9)

The method of claim 9, wherein the coating layer of the separator is on one side or both sides of the porous substrate.

### Claim 11 (depends on 1)

The method of claim 1, wherein the second reactive functional group is selected from the group consisting of an —OH group, a —CHO group, a —COOH group, a —COX group, a —COO— group, a —NH2 group, a group derived from maleic acid, a group derived from maleic anhydride, and a combination thereof, wherein X is halogen.

### Claim 12 (depends on 1)

The method of claim 1, wherein the chemical bond is included in a functional group selected from the group consisting of —CONH—, —COO—, —N(H)COOC(O)—, —CH(OH)CH2OC(O)—, —C(NH—R)OO—, —C(OH)N(H)—, —C(OH)C(O)—, —OC(O)N(H)—, —N(H)C(O)N(H)—, —SC(O)—, and a combination thereof, wherein R is an organic group.

### Claim 13 (depends on 1)

The method of claim 1, wherein the binder having the second reactive functional group is selected from the group consisting of polyvinylalcohol, carboxylmethylcellulose, hydroxypropylcellulose, a carboxylated polyvinylchloride, polyurethane, diacetylcellulose, an acrylated styrene-butadiene rubber, and combinations thereof.

### Claim 14 (depends on 1)

The method of claim 1, wherein the binder having the second reactive functional group is selected from the group consisting of polyvinylchloride, polyvinylfluoride, an ethylene oxide-containing polymer, polyvinylpyrrolidone, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, a styrene-butadiene rubber, an epoxy resin, nylon, and combinations thereof, and
wherein the polyvinylchloride, polyvinylfluoride, ethylene oxide-containing polymer, polyvinylpyrrolidone, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, epoxy resin, nylon, and combinations thereof include the second reactive functional group.

### Claim 15 (depends on 1)

The method of claim 1, wherein the electrode further comprises another binder selected from the group consisting of diacetylcellulose, polyvinylchloride, polyvinylfluoride, an ethylene oxide-containing polymer, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, a styrene-butadiene rubber, an acrylated styrene-butadiene rubber, an epoxy resin, nylon, and combinations thereof.

### Claim 16 (depends on 1)

The method of claim 1, wherein the electrode is a positive electrode or a negative electrode.

### Claim 17 (depends on 1)

The method of claim 1, wherein the coating layer-forming composition comprises the organic/inorganic bindable silane compound having the first reactive functional group in an amount in a range of about 1 to about 20 parts by weight based on 100 parts by weight of the inorganic compound.

### Claim 18 (depends on 8)

The method of claim 8, wherein the coating layer-forming composition comprises the inorganic compound and the polymer in a weight ratio in a range of about 1:0.5 to about 1:5.