Microstructured ion-conducting composites and uses thereof
View Patent ↗A composite membrane with nanostructured inorganic and organic phases is applied as an ion-selective layer to prove processability, prevent dendrite shorting, and increase power output of lithium-metal anodes through better Li-ion conductivity. Nanoconfinement, as opposed to macroscale confinement, is known to dramatically alter the properties of bulk materials. Control over a ceramic's size, shape, and properties is achieved with polymer templates. This is a new composition of matter and unique approach to composite membrane design.
1. A composition comprising:
a microporous polymer having a plurality of void spaces with a porosity from at least 5% (v/v) to 50% (v/v), wherein the microporous polymer comprises a polymer of intrinsic microporosity; and
an inorganic component comprising a halide containing salt occupying the void spaces,
wherein the inorganic component is present in at least 5% (w/w),
wherein the composition is ionically conductive.
2. The composition of claim 1 , wherein the inorganic component is structured with domains nominally at a length scale of 0.5-2 nanometers.
3. The composition of claim 1 , wherein the microporous polymer comprises a linear polymer, a branched polymer, or a network polymer with high fractional free volume.
4. The composition of claim 1 , wherein the porosity of the microporous polymer is from at least 10% (v/v) to 50% (v/v).
5. The composition of claim 1 , wherein the porosity of the microporous polymer is about 20% (v/v).
6. The composition of claim 1 , wherein the inorganic component comprises lithium iodide, sodium iodide, potassium iodide, rubidium iodide, cesium iodide, magnesium iodide, tetramethylammonium iodide, tetraethylammonium iodide, tetrapropylammonium iodide, tetrabutylammonium iodide, lithium bromide, sodium bromide, potassium bromide, rubidium bromide, cesium bromide, magnesium bromide, tetramethylammonium bromide, tetraethylammonium bromide, tetrapropylammonium bromide, tetrabutylammonium bromide, lithium chloride, sodium chloride, potassium chloride, rubidium chloride, cesium chloride, magnesium chloride, tetramethylammonium chloride, tetraethylammonium chloride, tetrapropylammonium chloride, tetrabutylammonium chloride, lithium fluoride, sodium fluoride, potassium fluoride, rubidium fluoride, cesium fluoride, magnesium fluoride, tetramethylammonium fluoride, tetraethylammonium fluoride, tetrapropylammonium fluoride, and/or tetrabutylammonium fluoride.
7. The composition of claim 1 , wherein the inorganic component comprises an alkali metal ion.
8. The composition of claim 1 , wherein the inorganic component is present in at least 10% (w/w).
9. The composition of claim 1 , wherein the inorganic component is present in at least 20% (w/w).
10. A composition of claim 1 , prepared by solution casting with the polymer, in-polymer-pore transformation of inorganic precursors, vapor deposition, or chemical transformation with the polymer.
11. An electrode comprising:
a metallic anode comprising of Li, Na, K, Mg, Ca, Zn, Al, Si, Ge, Sn, or an alloy thereof; and
a composition of claim 1 , coated on the metallic anode.
12. A separator comprising:
a porous support; and
a composition of claim 1 , coated on the porous support.
13. An electrode-separator laminate comprising:
a metallic anode comprising of Li, Na, K, Mg, Ca, Zn, Al, Si, Ge, Sn, or an alloy thereof; and
a separator of claim 12 , coated on the metallic anode.
14. An electrochemical cell comprising:
an anode of claim 11 ;
an electrolyte; and
a cathode.
15. The electrochemical cell of claim 14 , further comprising:
a separator comprising:
a porous support, and
a composition comprising a microporous polymer having a plurality of void spaces with a porosity from at least 5% (v/v) to 50% (v/v); and
an inorganic component occupying the void spaces,
wherein the inorganic component is present in at least 5% (w/w),
wherein the composition is ionically conductive, and
wherein the composition is coated on the porous support.