Battery electrode and method of making
Patent
·
OSTI ID:5901635
An improvement is provided for the manufacture of perhalogenated polymer, e.g., PTFE, bonded electrodes. The formulation comprises a mixture of an active material is carbon monofluoride (otherwise known as fluorinated graphite or fluorinated carbon or CF /SUB x/ or (C/sub 2/F) /SUB n/ ); a conductive carbon additive, such as acetylene black or graphite; and polytetrafluoroethylene (PTFE). The process comprises high shear mixing to cause the PTFE to fibrillate. The mixture is then wet with a nonpolymeric pore-former to make the mixture more pliable and to create micropores in the electrode when the solution is removed by evaporation. The wet mixture is then sequentially suitably formed into a, e.g., extruded, or calendered or pressed to flatten the mixture to a thin sheet and rolled up and folded and pressed out again until a uniform sheet is obtained and the like. The resulting product affords a sheet which is relatively flexible, and stronger and allows a lower PTFE loading than has been obtained with other electrode sheet materials formed with fibrillatable polymers. The higher the PTFE content, the higher the voltage losses for the electrode.
- Assignee:
- Allied Corp.
- Patent Number(s):
- US 4556618
- OSTI ID:
- 5901635
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
ACETYLENE
ALKYNES
CARBON
CARBON COMPOUNDS
CARBON FLUORIDES
CHEMICAL COMPOSITION
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTAL MINERALS
ELEMENTS
FABRICATION
FLUORIDES
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINE COMPOUNDS
GRAPHITE
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
MATERIALS WORKING
MINERALS
MIXING
NONMETALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYTETRAFLUOROETHYLENE
POWDERS
PRESSING
PYROLYSIS PRODUCTS
ROLLING
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
ACETYLENE
ALKYNES
CARBON
CARBON COMPOUNDS
CARBON FLUORIDES
CHEMICAL COMPOSITION
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTAL MINERALS
ELEMENTS
FABRICATION
FLUORIDES
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINE COMPOUNDS
GRAPHITE
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
MATERIALS WORKING
MINERALS
MIXING
NONMETALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYTETRAFLUOROETHYLENE
POWDERS
PRESSING
PYROLYSIS PRODUCTS
ROLLING