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1. WO2021144277 - LITHIUM METAL ANODE COATING

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[ EN ]

Claims

1. A composition for coating a lithium metal anode of a lithium metal battery comprising or consisting of a mixture of:

(i) nanoparticles of at least one electrolyte-insoluble lithium salt, optionally selected from the group consisting of LiF, LiCI, LiBr, Lil, LhO, U2CO3, LiOH, U3N and LhS; and

(ii) at least one lithium ion-coordinating polymer, optionally an ether- or nitrile comprising polymer, optionally selected from the group consisting of polyethylene oxide (PEO), polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), polydimethylsiloxane (PDMS), polyglycolide (PGA), polylactide (PLA), polyvinyl alcohol (PVA), polyvinylamine (PVAm) and chitosan;

wherein the nanoparticles have a diameter of less than 1000 nm, optionally less than 300 nm.

2. The composition according to claim 1, wherein the volume ratio between the nanopar ticles of the at least one lithium salt and the at least one polymer is selected from 10 vol.- % to 90 vol.-%, 20 vol.-% to 80 vol.-%, 25 vol.-% to 70 vol.-% and 50 vol.-% to 70 vol.-% lithium salt.

3. The composition according to claim 1 or 2, wherein the nanoparticles have a diameter of about 0.1 to 300 nm, 0.1 to 200 nm, or 0.1 to 100 nm, optionally a diameter of 50 to 200 nm.

4. The composition according to any of claims 1 to 3, wherein the at least one lithium salt is LiF and the at least one polymer is PEO.

5. A method for preparing a composition according to any of claims 1 to 4 comprising the steps:

(i) providing nanoparticles of at least one electrolyte-insoluble lithium salt, optionally selected from the group consisting of LiF, LiCI, LiBr, Lil, LhO, L12CO3, LiOH, L13N and L12S, wherein the nanoparticles have a diameter of less than 1000 nm, optionally less than 300 nm, optionally prepared by ball-milling, optionally prepared by high-energy ball milling; and

(ii) mixing the nanoparticles with at least one lithium ion-coordinating polymer, optionally an ether- or nitrile-comprising polymer, optionally selected from the group consisting of polyethylene oxide (PEO), polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), polydimethylsiloxane (PDMS), polyglycolide (PGA), polylactide (PLA), polyvinyl alcohol (PVA), polyvinylamine (PVAm) and chitosan.

6. A use of a composition according to any of claims 1 to 4 for coating a lithium metal anode, optionally directly coating a lithium metal anode, of a lithium metal battery.

7. The use according to claim 6, wherein the coated composition is a monolayer and/or has a thickness selected from the group consisting of 0.1 to 50, 0.5-50 pm, 0.5-30 pm, and 1-10 pm.

8. A method of coating a lithium metal anode of a lithium metal battery comprising the steps:

(i) providing at least one lithium metal anode;

(ii) providing nanoparticles of at least one electrolyte-insoluble lithium salt, optionally selected from the group consisting of LiF, LiCI, LiBr, Lil, LpO, U2CO3, LiOH, U3N and LpS, wherein the nanoparticles have a diameter of less than 1000 nm, optionally less than 300 nm, optionally prepared by ball-milling, optionally prepared by high-energy ball milling;

(iii) mixing the nanoparticles of step (ii) with a solution of at least one lithium ion coordinating polymer, optionally an ether- or nitrile-comprising polymer, optionally selected from the group consisting of polyethylene oxide (PEO), polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), polydimethylsiloxane (PDMS), polyglycolide (PGA), polylactide (PLA), polyvinyl alcohol (PVA), polyvinylamine (PVAm) and chitosan, optionally by stirring;

(iv) coating, optionally directly coating, the at least one lithium metal anode of step (i) with the mixture of step (iii), optionally by drop-casting, spin-coating, blade-coating, or slot-die coating; and

(v) drying the coated lithium metal anode of step (iv), optionally in vacuum.

9. The method according to claim 8, wherein the volume ratio between the nanoparticles of the at least one lithium salt and the at least one polymer in step (iii) is selected from 10 vol.-% to 90 vol.-%, 20 vol.-% to 80 vol.-%, 25 vol.-% to 70 vol.-% and 50 vol.-% to 70 vol.-% lithium salt.

10. The method according to claim 8 or 9, wherein the anode is coated in step (iv) with a monolayer and/or wherein the thickness of the coating is selected from 0.1 to 50, 0.5-50 pm, 0.5-30 pm, and 1-10 pm.

11. The method according to any of claims 8 to 10, wherein the nanoparticles have a diameter of about 0.1 to 300 nm, 0.1 to 200 nm, or 0.1 to 300 nm, optionally a diameter of 50 to 200 nm.

12. A lithium metal anode coated, optionally directly coated, with the composition according to any of claims 1 to 4 or prepared according to the method of any of claims 8 to 11.

13. A battery comprising the lithium metal anode according to claim 12.