US2021242532A1PendingUtilityA1

Battery Separator With Improved Oxidation Stability

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Assignee: DARAMIC LLCPriority: Apr 12, 2002Filed: Apr 22, 2021Published: Aug 5, 2021
Est. expiryApr 12, 2022(expired)· nominal 20-yr term from priority
Inventors:Jörg DeitersKlaus Heinrich Ihmels
H01M 10/06H01M 50/417H01M 50/42H01M 50/446Y02E60/10Y02P70/50H01M 50/411H01M 10/12H01M 50/403
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Claims

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

exact text as granted — not AI-modified
1 . A battery separator comprising 0.5 to 7.1 wt. % of an additive to prevent premature oxidation of the separator. 
     
     
         2 . The battery separator of  claim 1 , comprising from 0.5 to 5.0 wt. % of an additive. 
     
     
         3 . The battery separator of  claim 1 , wherein the additive comprises a fatty alcohol. 
     
     
         4 . The battery separator of  claim 3 , wherein the fatty alcohol comprises 1-dodecanol, 1-tetradecanol, 1-hexadecanol, 1-octadecanol, or combinations thereof. 
     
     
         5 . The battery separator of  claim 4 , wherein the fatty alcohol comprise 1-dodecanol. 
     
     
         6 . The battery separator of  claim 4 , wherein the fatty alcohol comprises 1-tetradecanol. 
     
     
         7 . The battery separator of  claim 4 , wherein the fatty alcohol comprises 1-hexadecanol. 
     
     
         8 . The battery separator of  claim 4 , wherein the fatty alcohol comprises 1-octadecanol. 
     
     
         9 . The battery separator of  claim 1 , wherein the additive comprises an alkoxylated alcohol. 
     
     
         10 . The battery separator of  claim 1 , wherein the additive comprises a fatty alcohol ethoxylate. 
     
     
         11 . The battery separator of  claim 10 , wherein the fatty alcohol ethoxylate has a general formula R 2 —(OC 2 H 4 ) p —OH, where R 2  is C12, C16, C18, and p is 2, 5, or 11. 
     
     
         12 . The battery separator of  claim 1 , wherein the additive comprises phthalic acid esters. 
     
     
         13 . The battery separator of  claim 1 , wherein the additive comprises stearyl phthalate. 
     
     
         14 . The battery separator of  claim 1 , wherein the additive comprises polyacrylates. 
     
     
         15 . The battery separator of  claim 1 , wherein the additive comprises a polyacrylic acid salt. 
     
     
         16 . The battery separator of  claim 1 , wherein the additive is not soluble or is difficultly soluble in each of water and sulfuric acid. 
     
     
         17 . The battery separator of  claim 1 , being one that would be liable to oxidative attack without addition of the additive. 
     
     
         18 . The battery separator of  claim 1 , having an oil content from 5 to 35 wt. %. 
     
     
         19 . The battery separator of  claim 1 , comprising 50 to 85 wt. % filler. 
     
     
         20 . The battery separator of  claim 1 , comprising a polyolefin.

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