| 摘要 |
An active material for a lithium battery electrode comprises a phase having the formula Li2+v-4cCcTi3-wFexMyM'zO7-alpha, in which M and M' are metal ions of groups of 2 to 15 having an ionic radius between 0.5 and 0.8 Å in an octahedral environment, v, w, x, y, z and alpha being associated by the relationships: 2alpha=-v+4w-3x-ny-n'z, with n and n' being the respective formal degrees of oxidation of M and M'; -0.5@v@0.5; y+z>0; x+y+z=w; and 0<w@0.3; and wherein at least part of the lithium is substituted by carbon according to the relationship 0<c&nlE(2+v)/4. The invention also includes a method for synthesizing the active material which comprises mixing and grinding the precursor compounds containing the metal components, carbon and oxygen; heating the mixture in an inert atmosphere at a temperature of 950 to 1050° C. in order to make a ceramic phase; and rapidly cooling the ceramic phase to produce the active material. |
