Abstract: An electrochemically active material is represented by general formula (I): SiuSnvM1wM2x[P0.2O0.8]y·Az(I) where u, v, w, x, y, and z represent atomic % values and u+v+w+x+y+z=100, M1 includes a metal element or combinations of metal elements selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, B, carbon, or alloys thereof, M2 includes a metal element or combinations of metal elements selected from Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, or alloys thereof, A is an inactive phase other than a phosphate or silicide, and 0<u<90, 0?v<20, 0<w<50, 0<x<20, 0<y<20, and 0?z<50.

Abstract: An electrochemically active material includes, prior to incorporation in an electrochemical full cell, reversible lithium corresponding to between 4% and 50% of the reversible capacity of the electrochemically active material. The electrochemically active material has a lithium consumption rate between 0.05% and 0.2%.

Abstract: An electrochemically active material includes, prior to incorporation in an electrochemical full cell, reversible lithium corresponding to between 4% and 50% of the reversible capacity of the electrochemically active material. The electrochemically active material has a lithium consumption rate between 0.05% and 0.2%.

Abstract: An electrochemically active material is represented by general formula (I): SiuSnvM1wM2x[P0.2O0.8]y.Az(I) where u, v, w, x, y, and z represent atomic % values and u+v+w+x+y+z=100, M1 includes a metal element or combinations of metal elements selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, B, carbon, or alloys thereof, M2 includes a metal element or combinations of metal elements selected from Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, or alloys thereof, A is an inactive phase other than a phosphate or silicide, and 0<u<90, 0?v<20, 0<w<50, 0<x<20, 0<y<20, and 0?z<50.

Abstract: An electrolyte solution includes a solvent; an electrolyte salt; and a LA:LB complex represented by the following general formula I: [(FnA)x-L] (I) In formula I, A is boron or phosphorous, F is fluorine, L is an aprotic organic amine, n is 3 or 5, when n=3, A is boron, and when n=5, A is phosphorous, x is an integer from 1-3, and at least one N atom of the aprotic organic amine, L, is bonded directly to A. The LA:LB complex is present in the solution in an amount of between 0.01 and 5.0 wt. %, based on the total weight of the electrolyte solution.

Abstract: An electrode composition is disclosed that includes a silicon alloy containing silicon, iron and optionally carbon. The silicon alloy is capable of undergoing lithiation and delithiation. The electrode composition also includes graphitic carbon, a binder, and a conductive additive containing carbon nanotubes. Such an electrode composition may be used in a negative electrode for an electrochemical cell that also contains a positive electrode and an electrolyte. Also disclosed are batteries containing such electrochemical cells and methods of making electrochemical cells using the electrode composition.