# US 9,520,583 B2 · Galvanic element with enhanced safety properties

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- Number: US 9,520,583 B2
- Document ID: US9520583B2
- Status: Granted
- Kind: B2
- Application number: 14/158,562
- Filed: 2014-01-17
- Published: 2014-07-24
- Granted: 2016-12-13
- Earliest claimed: 2013-01-18
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Thomas Wöhrle; Felix Eberle
- Web page: https://patentgrep.com/patent/US9520583B2

## CPC

- H01M 50/44: Fibrous material
- H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M 50/434: Ceramics
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/457: comprising three or more layers
- 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
- H01M 50/491: Porosity
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/4295: {Natural cotton, cellulose or wood}
- 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
- 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

## Abstract

A galvanic element includes at least one lithium-intercalating and at least one lithium-deintercalating electrode. A positive electrode and a negative electrode are separated by a polyimide-based separator that has a labyrinth porosity. The polyimide-based separator is configured at least on one side with a porous, ceramically-based coating that comprises a binder and ceramic particles.

## Claims

### Claim 1

A galvanic element, comprising:
at least one lithium-intercalating electrode and at least one lithium-deintercalating electrode; and
a polyimide-based separator separating the electrodes, the polyimide-based separator having a labyrinth porosity and being configured at least on one side with an outermost coating including a binder and ceramic particles.

### Claim 2 (depends on 1)

The galvanic element according to claim 1, wherein the coating comprises ceramic particles composed of inorganic, nonmetallic substances.

### Claim 3 (depends on 1)

The galvanic element according to claim 1, wherein the ceramic particles of the coating are selected from the group consisting of the following ceramics: Li1.5 Al0.5Ge1.5 (PO4)3, phosphate, sulfides, titanates.

### Claim 4 (depends on 1)

The galvanic element according to claim 1, wherein the ceramic particles of the coating are selected from the group consisting of the following compounds: Li9AlSiO8, Li7SiPO8, LiAlCl4, LiL(Al2O3), Lil*4CH3OH, Li0.34La0.51TiO2.94, 0.5LiTaO3—O.5SrTiO3, Li1.3Al0.3Ti1.7(PO4)3, 0.01Li3PO4-0.63Li2S-0.36SiS2.

### Claim 5 (depends on 1)

The galvanic element according to claim 1, wherein the coating comprises a polymeric binder that is fluorinated.

### Claim 6 (depends on 5)

The galvanic element according to claim 5, wherein the binder comprises polyvinylidene fluoride, polyvinylidene-hexafluoropropylene, or polytetra-fluoroethylene.

### Claim 7 (depends on 5)

The galvanic element according to claim 5, wherein the binder of the coating takes the form of copolymers based on styrene-butadiene or cellulose-based.

### Claim 8 (depends on 1)

The galvanic element according to claim 1, wherein a separator thickness of the polyimide-based separator is in the range between 5 μm to 50 μm.

### Claim 9 (depends on 1)

The galvanic element according to claim 1, wherein the coating is applied on one or both sides of the polyimide-based separator.

### Claim 10 (depends on 1)

The galvanic element according to claim 1, wherein a coating thickness of the coating is between 1 μm to 20 μm.

### Claim 11 (depends on 1)

The galvanic element according to claim 1, wherein the galvanic element is used in a lithium ion cell, a lithium ion module, a lithium ion pack, or a lithium ion battery.

### Claim 12 (depends on 1)

The galvanic element according to claim 1, wherein the galvanic element is packaged in a composite aluminum foil.

### Claim 13 (depends on 1)

The galvanic element according to claim 1, wherein the galvanic element is packaged in a solid metallic housing.

### Claim 14 (depends on 8)

The galvanic element according to claim 8, wherein the separator thickness of the polyimide-based separator is in the range between 10 μm and 30 μm.

### Claim 15 (depends on 10)

The galvanic element according to claim 10, wherein the coating thickness of the coating is between 2 μm and 6 μm.