Li3N as a Cathode Additive for High-Energy-Density Lithium-Ion Batteries

The formation of a solid-electrolyte interphase on the anode surface of an Li-ion battery using an organic liquid electrolyte robs Li+ irreversibly form the cathode on the initial charge if the cells are fabricated in the discharged state. In order to increase the cathode capacity, the use of Li3N as a sacrificial source of Li+ on the initial charge has been evaluated chemically and electrochemically as an additive to an LiCoO2 cathode. Li3N is shown to be chemically stable in a dry atmosphere as small particles with fresh surfaces and can increase the reversible capacities of a full cell without compromising the rate capability of the cells.