ULTRATHIN SURFACE COATING ON NEGATIVE ELECTRODES TO PREVENT TRANSITION METAL DEPOSITION AND METHODS FOR MAKING AND USE THEREOF

摘要

An electrode material for use in an electrochemical cell, like a lithium-ion battery, is provided. The electrode material may be a negative electrode comprising graphite, silicon, silicon-alloys, or tin-alloys, for example. By avoiding deposition of transition metals, the battery substantially avoids charge capacity fade during operation. The surface coating is particularly useful with negative electrodes to minimize or prevent deposition of transition metals thereon in the electrochemical cell. The coating has a thickness of less than or equal to about 40 nm. Methods for making such materials and using such coatings to minimize transition metal deposition in electrochemical cells are likewise provided.

主权项

1. An electrode material for an electrochemical cell comprising:
a coating formed on one or more surface regions of a negative electrode comprising a material selected from the group consisting of: graphite, silicon, silicon-containing alloys, tin-containing alloys, and combinations thereof, wherein the coating has a thickness of less than or equal to about 40 nm to minimize or prevent deposition of transition metals onto the negative electrode within the electrochemical cell.