Coated metal oxide particles with low dissolution rate, methods for preparing same and use thereof in electrochemical systems
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United States of America Patent
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Jun 29, 2021
Grant Date -
Nov 30, 2017
app pub date -
Aug 11, 2017
filing date -
Jan 25, 2006
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Abstract
Particles including a core and a coat covering at least part of the core surface. The core has more than 50% of an acidic metal oxide and the core coating is based on a polymer, preferably based on a solid polymer with high electrochemical stability. The particle has a solubility rate (ds), in fixed time, of the metal oxide migrating towards the electrolyte, per cycle, which is less than 5 per 10000. The particles are obtained by mixing the polymer and a metal oxide, via dry process with addition of solvent. The electrodes constituting an electrode substrate at least partly coated with a mixture consisting of at least 40 of those particles have remarkable electrochemical properties, in particular regarding the lifetime of batteries in which they are incorporated.
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