Solid-state composite electrolytes comprising aramid polymer fibrils
AssigneeDupont Safety & Construction, Inc.
InventorsMehdi Afshari, Byoung Sam Kang
Life of this patent
Estimating the term…
Abstract
A solid-state composite electrolyte, suitable for use in solid-state batteries, and a battery comprising same, the solid-state composite electrolyte comprising 70 to 99 weight percent inorganic solid electrolyte and 1 to 30 weight percent aramid polymer fibrils, based on the total weight of the inorganic solid electrolytes and aramid fibrils in the solid-state composite electrolyte, wherein the aramid polymer fibrils have: i) a diameter of 10 to 2000 nanometers, ii) a length of 0.2 to 3 millimeters, iii) a specific surface area of 3 to 40 square meters/gram, and iv) a Canadian Standard Freeness of 0 to 100 milliliters; the solid-state composite electrolyte having a thickness of 5 to 1000 micrometers.
Claims11
A solid-state composite electrolyte, suitable for use in solid-state batteries, comprising:
- 70 to 99 weight percent inorganic solid electrolyte and 1 to 30 weight percent aramid polymer fibrils, based on the total weight of the inorganic solid electrolyte and aramid fibrils in the solid-state composite electrolyte,
- wherein the aramid polymer fibrils are stalk-free refined fibrils, the aramid polymer comprising a blend of polymers comprising 80 to 96 weight percent poly (paraphenylene terephthalamide) and 4 to 20 weight percent of poly (vinyl pyrrolidone), and
- wherein the aramid polymer fibrils have:
- i) a diameter of 10 to 2000 nanometers, wherein the aramid polymer fibrils have a total diameter size range of 300 nanometers,
- ii) a length of 0.2 to 3 millimeters,
- iii) a specific surface area of 3 to 40 square meters/gram, and
- iv) a Canadian Standard Freeness of 0 to 100 milliliters;
- the solid-state composite electrolyte having a thickness of 5 to 95 micrometers, the solid-state composite electrolyte having a fracture toughness of from 0.5 to 10 MPa m1/2.
A process for making a solid-state composite electrolyte, suitable for use in solid-state batteries, comprising the steps of:
- a) combining 70 to 99 parts by weight inorganic solid electrolyte and 1 to 30 parts by weight aramid polymer fibrils, based on 100 total parts of the inorganic solid electrolyte and aramid fibrils, to form a mixture;
- b) consolidating the mixture by the application of pressure and heat for a time sufficient to form a solid-state composite electrolyte having a thickness of 5 to 95 micrometers and a fracture toughness of from 0.5 to 10 MPa m1/2;
- wherein the aramid polymer fibrils are stalk-free refined fibrils, the aramid polymer comprising a blend of polymers comprising 80 to 96 weight percent poly (paraphenylene terephthalamide) and 4 to 20 weight percent of poly (vinyl pyrrolidone), and
- wherein the aramid polymer fibrils have
- i) a diameter of 10 to 2000 nanometers, wherein the aramid polymer fibrils have a total diameter size range of 300 nanometers,
- ii) a length of 0.2 to 3 millimeters,
- iii) a specific surface area of 3 to 40 square meters/gram, and
- iv) a Canadian Standard Freeness of 0 to 100 milliliters.
Dependencies are inferred from the claim text.