27-01-2022 дата публикации
Номер: US20220025502A1
A dry process for coating Ni-rich cathode powder with cubic LLZO powder prepared by flame spray pyrolysis. 1. A method , comprising:mixing, by ball-milling, a lithium metal oxide cathode material with a doped LLZO powder until the lithium metal oxide cathode material has a particle size of at least 6 microns and equal to or less than 15 microns, wherein the LLZO consisting of primary particles between 200 nanometers to 1 micrometer in size, forming a LLZO-cathode material mixture of 90-99.9 wt % lithium metal oxide cathode material and 0.1 to 10 wt % doped LLZO powder; andcalcining the LLZO-cathode material mixture between 300° C. and 700° C. for 1-10 hours.2. The method of claim 1 , wherein the LLZO is produced by flame spray pyrolysis.3. The method of claim 1 , wherein the doped LLZO powder comprises aluminum claim 1 , tantalum claim 1 , yttrium claim 1 , iron claim 1 , tellurium claim 1 , tungsten claim 1 , niobium claim 1 , barium claim 1 , cerium claim 1 , titanium claim 1 , boron claim 1 , antimony claim 1 , or gallium as a dopant which replaces 3-50 mol % of Li or Zr in LiLaZrO.4. (canceled)5. The method of claim 1 , wherein the lithium metal oxide cathode material comprises LiNiCoMnOmaterial claim 1 , where x+y+z=1.6. The method of claim 5 , wherein x≥0.6.7. The method of claim 1 , wherein mixing is at 50-300 RPM for 5-90 minutes.8. (canceled)9. (canceled)10. (canceled)11. An electrochemical cell comprising the LLZO coated lithium metal oxide of as the cathode material.12. (canceled)13. A method claim 1 , comprising:forming a doped LLZO powder by flame spray pyrolysis;{'sub': 7', '3', '2', '12, 'ball-milling a lithium metal oxide cathode material until the lithium metal oxide cathode material has a particle size of at least 6 microns and equal to or less than 15 microns with the doped LLZO powder comprising LiLaZrOwith 3-50 mol % of one or both of Li and Zr replaced with an aluminum dopant, wherein the LLZO consisting of primary particles between 200 ...
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