MULTIFUNCTIONAL HYBRID COATINGS FOR ELECTRODES MADE BY ATOMIC LAYER DEPOSITION TECHNIQUES

摘要

An electroactive material for use in an electrochemical cell, like a lithium ion battery, is provided. The electroactive material comprises a multifunctional hybrid protective coating system formed over an electroactive material. The coating system includes a first oxide-based coating disposed on one or more surfaces of the electroactive material, followed by a second coating deposited via a non-aqueous process. The second coating may be a fluoride-based, nitride-based, or carbide-based coating. The first and second coatings may be applied by atomic layer deposition (ALD) to form conformal ultrathin layers over the electroactive materials. Such a multifunctional hybrid protective coating system can suppress formation of gases within the electrochemical cell and also minimize formation of solid electrolyte interface (SEI) layers on the electrode to improve battery performance. Methods for making such materials and using such materials in electrochemical cells are likewise provided.

主权项

1. An electrode for an electrochemical cell comprising:
an electroactive material; a first oxide-based coating formed on one or more surface regions of the electroactive material; and a second coating disposed over the first oxide-based coating, wherein the second coating is distinct from the first oxide-based coating and is formed from a non-aqueous coating process.