Cathode Additives to Provide an Excess Lithium Source for Lithium Ion Batteries

摘要

A lithium ion electrochemical cell is described in which the lithium comprising further comprises a lithiation agent. The lithiation agent, which comprises a lithium constituent, is designed to provide an excess source of lithium to minimize capacity loss of the lithium ion electrochemical cell. The anode of the lithium ion cell comprises a material matrix comprising carbon, graphene and an active element such as silicon or tin.

主权项

1. An electrochemical cell, comprising:
a) a negative electrode comprising a negative electrode active material having an active constituent; b) a positive electrode comprising a lithium containing positive electrode active material; c) a lithium containing lithiation agent located in at least one of the positive electrode and the negative electrode, wherein lithium from the lithiation agent irreversibly reacts with the active constituent of the negative electrode active material to form a lithium compound in and/or on the negative electrode; and c) an ionically conductive electrolyte located between the positive electrode and the negative electrode.