DESIGN OF MULTI-ELECTRON LI-ION PHOSPHATE CATHODES BY MIXING TRANSITION METALS

摘要

In general, the invention relates to electrode materials, e.g., novel cathode materials with high density, low cost, and high safety. A voltage design strategy based on the mixing of different transition metals in crystal structures known to be able to accommodate lithium in insertion and delithiation is presented herein. By mixing a metal active on the +2/+3 couple (e.g., Fe) with an element active on the +3/+5 or +3/+6 couples (e.g., V or Mo), high capacity multi-electron cathodes are designed in an adequate voltage window.

主权项

1. A compound of overall formula LiaMxM′yX, wherein
M is an element from the group [Fe, Mn, Cr, Co, Ni, Zn, Mg] or a combination of elements from this group; M′ is an element from the group [Mo, V] or a combination of elements from this group; X is a phosphate-comprising chemical group; x+y has a value between 0.9 and 1.1; and a has a value between 0 and 2x+y.