Hi Names, 5N is 99.999% purity, I cannot imagine there being any improvement in battery capacity or cycling using this higher-grade material.
ATC conducted tests with a German testing facility in 2020 (HPA separators), where they tested HPA from different production methods.
There appears to be a risk of sodium leaching HPA depending on the production method.
FYI and ATC both use clay material to extract the contained Alumina (HPA) and should not see any sodium leaching.
Announcement attached for you to review.
https://www.asx.com.au/asx/statistics/displayAnnouncement.do?display=pdf&idsId=02238402
Ann: Outstanding Result for Enhanced HPA Anode Coatings, page-5
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