# US 2021/0242532 A1 · Battery Separator With Improved Oxidation Stability

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- Number: US 2021/0242532 A1
- Document ID: US20210242532A1
- Status: Published application
- Kind: A1
- Application number: 17/237,706
- Filed: 2021-04-22
- Published: 2021-08-05
- Earliest claimed: 2002-04-12
- Assignees: Daramic, LLC
- Applicants: Daramic, LLC
- Inventors: Jorg Deiters; Klaus Heinrich Ihmels
- Web page: https://patentgrep.com/patent/US20210242532A1

## CPC

- H01M 10/06: Lead-acid accumulators (semi-lead accumulators H01M10/20)
- H01M 50/417: Polyolefins
- H01M 50/42: Acrylic resins
- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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

## Abstract

The invention relates to a thermoplastic polymer-based battery separator, which contains a compound of formula R (OR1)n(COOMx+1/x)m. In said formula, R represents a non-aromatic hydrocarbon group comprising between 10 and 4,200 carbon atoms, which can be interrupted by oxygen atoms, R1 represents H, —(CH2)kCOOMx+1/x or —(CH2)k—SO3Mx+1/x, whereby k stands for 1 or 2, M represents an alkali or earth alkaline metal ion, H+ or NH4+, whereby not all variables of M are defined simultaneously as H+, n stands for 0 or 1, m stands for 0 or a whole number from 10 to 1,400 and x stands for 1 or 2. The ratio of oxygen atoms to carbon atoms in the compound according to the aforementioned formula ranges between 1:1.5 and 1:30 and n and m cannot simultaneously represent zero.

## Claims

### Claim 1

A battery separator comprising 0.5 to 7.1 wt. % of an additive to prevent premature oxidation of the separator.

### Claim 2 (depends on 1)

The battery separator of claim 1, comprising from 0.5 to 5.0 wt. % of an additive.

### Claim 3 (depends on 1)

The battery separator of claim 1, wherein the additive comprises a fatty alcohol.

### Claim 4 (depends on 3)

The battery separator of claim 3, wherein the fatty alcohol comprises 1-dodecanol, 1-tetradecanol, 1-hexadecanol, 1-octadecanol, or combinations thereof.

### Claim 5 (depends on 4)

The battery separator of claim 4, wherein the fatty alcohol comprise 1-dodecanol.

### Claim 6 (depends on 4)

The battery separator of claim 4, wherein the fatty alcohol comprises 1-tetradecanol.

### Claim 7 (depends on 4)

The battery separator of claim 4, wherein the fatty alcohol comprises 1-hexadecanol.

### Claim 8 (depends on 4)

The battery separator of claim 4, wherein the fatty alcohol comprises 1-octadecanol.

### Claim 9 (depends on 1)

The battery separator of claim 1, wherein the additive comprises an alkoxylated alcohol.

### Claim 10 (depends on 1)

The battery separator of claim 1, wherein the additive comprises a fatty alcohol ethoxylate.

### Claim 11 (depends on 10)

The battery separator of claim 10, wherein the fatty alcohol ethoxylate has a general formula R2—(OC2H4)p—OH, where R2 is C12, C16, C18, and p is 2, 5, or 11.

### Claim 12 (depends on 1)

The battery separator of claim 1, wherein the additive comprises phthalic acid esters.

### Claim 13 (depends on 1)

The battery separator of claim 1, wherein the additive comprises stearyl phthalate.

### Claim 14 (depends on 1)

The battery separator of claim 1, wherein the additive comprises polyacrylates.

### Claim 15 (depends on 1)

The battery separator of claim 1, wherein the additive comprises a polyacrylic acid salt.

### Claim 16 (depends on 1)

The battery separator of claim 1, wherein the additive is not soluble or is difficultly soluble in each of water and sulfuric acid.

### Claim 17 (depends on 1)

The battery separator of claim 1, being one that would be liable to oxidative attack without addition of the additive.

### Claim 18 (depends on 1)

The battery separator of claim 1, having an oil content from 5 to 35 wt. %.

### Claim 19 (depends on 1)

The battery separator of claim 1, comprising 50 to 85 wt. % filler.

### Claim 20 (depends on 1)

The battery separator of claim 1, comprising a polyolefin.