Coating for lithium titanate to suppress gas generation in lithium-ion batteries and method for making and use thereof

Abstract

An electroactive material for use in an electrochemical cell, like a lithium-ion battery, is provided. The electroactive material comprises lithium titanate oxide (LTO) and has a surface coating with a thickness of less than or equal to about 30 nm that suppresses formation of gases within the electrochemical cell. Methods for making such materials and using such materials to suppress gas formation in electrochemical cells are likewise provided.

Description

field of invention [0001] The present invention relates to coatings for lithium titanate oxide electroactive materials used in electrochemical devices that inhibit gas evolution, such as fluoride based coatings, methods of making such coatings and methods of their use. Background of the invention [0002] This section provides background information related to the present disclosure which is not necessarily prior art. [0003] High energy density electrochemical cells such as lithium-ion batteries can be used in a variety of consumer products and vehicles. A typical lithium-ion battery contains a first electrode such as a cathode, a second electrode such as an anode, an electrolyte material, and a separator. Often, a stack of lithium-ion battery cells is electrically connected together to increase the overall output. Conventional lithium-ion batteries operate by reversibly transporting lithium ions between negative and positive electrodes. The separator and electrolyte a...

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Problems solved by technology

[0006] However, while LTO is a promising anode material for high power Li-ion battery packs, offering extremely long life and exceptional resistance to overcharging and abuse tolerance, but in some cases LTO can potentially have certain disadvantages when used with certain cathode materials and electrolytes

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