High ionic conductivity composite LiLaZrBiO garnet—polymer electrolyte
AssigneePurdue Research Foundation
InventorsAndres Villa Pulido, Esteban Marinero-Caceres, Muhammed Oduncu
Life of this patent
Estimating the term…
Abstract
A method of controlling the ionic conductivity of a polymer member, including providing a plurality of particles of bi-doped garnet, dispersing the plurality of particles of bi-doped garnet in a PEO matrix to yield a polymer member, nucleating spherulites at bi-doped garnet particle sites, and growing spherulites to a critical density to provide ionic conductivity pathways throughout the polymer member.
Claims23
A solid-state flexible electrolyte member for a lithium ion electrochemical cell, comprising:
- a flexible thin film substrate portion;
- an ionic salt dissolved into the flexible thin film substrate portion;
- and
- an aliovalently-doped LLZO (lithium lanthanum zirconium oxide) garnet of formula Li7-xLa3Zr2-xBixO12, where x is in the range 0.01 to 1.99;
- wherein the aliovalently-doped LLZO garnet portion is dispersed in the flexible thin film substrate portion to define the solid-state flexible electrolyte member;
- wherein the aliovalently-doped LLZO garnet portion defines a plurality of cubic garnet particles having diameters ranging from 1 nanometer to 500 microns;
- wherein the solid-state flexible electrolyte member has an aliovalently-doped LLZO concentration of between two and a half weight percent and ten weight percent.
A lithium ion electrochemical cell, comprising:
- a first electrode;
- a second electrode;
- a flexible thin film substrate portion positioned between the first and second electrodes;
- and
- a plurality of bismuth-doped LLZO garnet meso-particles of formula Li7-xLa3Zr2-xBixO12, where x is in the range 0.01 to 1.99 homogeneously dispersed in the flexible thin film substrate portion;
- wherein the first and second electrodes are in ionic communication through the flexible thin film substrate portion;
- and
- wherein the concentration of the bismuth-doped LLZO garnet material in the flexible thin film portion is between two and a half weight percent and ten weight percent and
- wherein the flexible thin film substrate portion has an ion conductivity of at least 1×10−4 S/cm at 35° C. and an electrical ion conductivity of at least 5×10−3 S/cm at 55° C.
A flexible solid-state electrolyte comprising particles of a bismuth-doped LLZO garnet of formula Li7-xLa3Zr2-xBixO12, where x is in the range 0.01 to 1.99 giving rise to ionic conduction embedded in a polymer matrix containing an ionic salt.
A method of fabricating a flexible solid-state electrolyte, the method comprising;
- providing particles of LLZO garnet material of formula Li7-xLa3Zr2-xBixO12, where x is in the range 0.01 to 1.99;
- mixing the particles of Li7-xLa3Zr2-xBixO12, PEO, and ionic salt in a solvent to form a slurry;
- ball milling the slurry to obtain a uniform dispersion of the Li7-xLa3Zr2-xBixO12 particles into a matrix made of PEO, resulting in a homogenized slurry;
- casting the homogenized slurry to form a film;
- and
- drying the film to form a flexible solid-state electrolyte;
- wherein the concentration of the LLZBO is between five weight percent and ten weight percent;
- and
- wherein the chemical composition of the Li7-xLa3Zr2-xBixO12 particles controls the polymer morphology of the flexible solid-state electrolyte giving rise to ionic conductivity.
A battery comprising:
- an anode;
- a cathode;
- and
- a PEO solid-state electrolyte infiltrated with between five and ten weight percent homogeneously distributed Li7-xLa3Zr2-xBixO12 particles, wherein x is in the range 0.01-1.99.
A method of controlling the ionic conductivity of a polymer member, comprising:
- providing a plurality of particles of bismuth-doped garnet;
- dispersing the plurality of particles of bismuth-doped garnet in a PEO matrix to yield the polymer member;
- nucleating spherulites at bismuth-doped garnet particle sites;
- and
- growing spherulites to a critical density to provide ionic conductivity pathways throughout the polymer member.
Dependencies are inferred from the claim text.