Battery separator

Patent · Tue Oct 13 00:00:00 EDT 1987

OSTI ID:5979713

Giovannoni, R T; Kung, J K.J.; Choi, W M

This patent describes a battery system composed of at least one pair of electrodes of opposite polarity, an electrolyte and a separator positioned between electrodes of opposite polarity. The improvement comprises that the separator is a microporous sheet composed of a substantially uniform composition of A. from 7 to 50 weight percent of a polymer mixture, the mixture formed from (a) from about 95 to about 40 weight percent of polyolefin formed from ethylene, propylene or mixtures thereof or a mixture of the polyolefins having a weight average molecular weight of at least about 3,000,000; and (b) from about 5 to about 60 weight percent of a polymeric blend formed from a polyethylene terpolymer and a vinyl or vinylidene halide polymer in a weight ratio of 19:1 to 1:3, the polyethylene terpolymer formed from (1) ethylene monomer, (2) at least one ethylenically unsaturated organic monomer selected from the group consisting of esters of unsaturated C/sub 3/-C/sub 20/ mono- or dicarboxylic acids, vinyl esters of saturated C/sub 2/-C/sub 18/ carboxylic acids, vinyl alkyl ethers wherein the alkyl group has 1-18 carbon atoms, vinyl or vinylidene halides, acrylonitrile, methacrylonitrile, norbornene, alpha-olefins of 3-12 carbon atoms, and vinyl aromatic compounds, and, (3) an additional monomer selected from the group consisting of ethylenically unsaturated C/sub 3/-C/sub 20/ carboxylic acids, carbon monoxide, and sulfur dioxide; B. from 93 to 50 weight percent of a filler which is substantially inert with respect to the battery electrodes and electrolyte; and C. from 0 to 20 weight percent of plasticizer for at least one of the polymers of the composition.

• Assignee: W.R. Grace and Co., New York, NY
• Patent Number(s): US 4699857
• OSTI ID: 5979713
• Resource Relation: Patent File Date: Filed date 15 Oct 1986
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
BATTERY SEPARATORS
CHEMICAL COMPOSITION
ALKENES
AROMATICS
CARBON MONOXIDE
CARBOXYLIC ACIDS
DESIGN
ELECTRIC BATTERIES
ELECTRODES
ELECTROLYTES
ESTERS
HALIDES
MICROSTRUCTURE
MONOMERS
POLYETHYLENES
POLYMERS
POLYVINYLS
POROSITY
POSITIONING
SHEETS
SULFUR DIOXIDE
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
ELECTROCHEMICAL CELLS
HALOGEN COMPOUNDS
HYDROCARBONS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
POLYOLEFINS
SULFUR COMPOUNDS
SULFUR OXIDES
250903* - Energy Storage- Batteries- Materials
Components
& Auxiliaries