# US 2017/0288191 A1 · Separator including a polysulfide barrier layer for a battery cell, and battery cell

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- Number: US 2017/0288191 A1
- Document ID: US20170288191A1
- Status: Published application
- Kind: A1
- Application number: 15/512,403
- Filed: 2015-09-01
- Published: 2017-10-05
- Earliest claimed: 2014-09-18
- Assignees: Robert Busch GmbH
- Applicants: Robert Busch GmbH
- Inventors: Bernd Schumann; Jean Fanous
- Web page: https://patentgrep.com/patent/US20170288191A1

## CPC

- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- H01M 4/38: of elements or alloys
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M 50/437: Glass
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/497: Ionic conductivity
- H01M 10/052: Li-accumulators
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using 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

## Abstract

A vehicle traction battery includes a battery cell, the battery cell including a cathode, and anode, and a separator the anode and cathode. The separator includes at least one protective layer that is impermeable to polysulfides and at least one ion-conducting conductive layer whose composition is different than that of the protective layer and that is designed as a copolymer which includes a stabilizing phase and an ionically conductive phase, the protective layer including an inorganic substance.

## Claims

### Claim 1

A separator (1) for separating an anode and a cathode in a battery cell, which includes at least one ion-conducting conductive layer (50) and at least one protective layer (40), which is impermeable to polysulfides, the conductive layer (50) and the protective layer (40) having different compositions from each other, wherein the conductive layer (50) is designed as a copolymer, which includes a stabilizing phase (2) as well as an ionically conductive phase (3), and the protective layer (40) includes an inorganic substance (7, 8).

### Claim 2 (depends on 1)

The separator (1) as recited in claim 1, wherein the inorganic substance of the protective layer (40) includes chemically reactive particles (7) which react with polysulfides.

### Claim 3 (depends on 2)

The separator (1) as recited in claim 2, wherein the chemically reactive particles (7) contain an alkali metal or an alkali metal compound or are made from an alkali metal or an alkali metal compound.

### Claim 4 (depends on 2)

The separator (1) as recited in claim 2, wherein the chemically reactive particles (7) contain an alkaline earth metal or an alkaline earth metal compound or are made from an alkaline earth metal or an alkaline earth metal compound.

### Claim 5 (depends on 2, 3, 4)

The separator (1) as recited in one of claims 2 through 4, wherein the chemically reactive particles (7) are situated at a distance from each other, clearances (31) remaining between the chemically reactive particles (7).

### Claim 6 (depends on 1)

The separator (1) as recited in claim 1, wherein the inorganic substance of the protective layer (40) includes composite particles (8), which are arranged close together, multiple composite particles (8) being in contact with each other.

### Claim 7 (depends on 6)

The separator (1) as recited in claim 6, wherein the composite particles (8) contain ion-conducting ceramic or are made from ion-conducting ceramic.

### Claim 8 (depends on 6)

The separator (1) as recited in claim 6, wherein the composite particles (8) contain argyrodite or are made from argyrodite.

### Claim 9

The separator (1) as recited in one of the preceding claims, wherein the ionically conductive phase (3) contains acrylates or polyethylene oxide.

### Claim 10

A battery cell, including at least one separator (1) as recited in one of the preceding claims.

### Claim 11 (depends on 10)

A use of a battery cell as recited in claim 10 in a traction battery of a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHEV) or an electric vehicle (EV).