| 摘要 |
Synthesis process for new particles of Li4Ti5O12, Li(4-α)ZαTi5O12 or Li4ZβTi(5-β)O12, preferably having a spinel structure, wherein β is greater than 0 and less than or equal to 0.5 (preferably having a spinel structure), α representing a number greater than zero and less than or equal to 0.33, Z representing a source of at least one metal, preferably chosen from the group made up of Mg, Nb, Al, Zr, Ni, Co. These particles coated with a layer of carbon notably exhibit electrochemical properties that are particularly interesting as components of anodes and/or cathodes in electrochemical generators. |
| 主权项 |
1. Particles of an oxide corresponding to a formula selected from:
Li4Ti5O12; and/or Li(4-α)ZαTi5O12, wherein α is greater than zero and less than or equal to 0.33 and wherein Z is a source of at least one metal; and/or Li4ZβTi(5-β)O12, wherein β is greater than 0 and/or less than or equal to 0.5 and Z is a source of at least one metal, wherein said particles are obtained by a process for synthesizing, in the presence of oxygen, particles of an oxide corresponding to a formula selected from: Li4Ti5O12; Li(4-α)ZαTi5O12, wherein α represents a number greater than zero and less than or equal to 0.33, and Z represents at least one metal; and Li4ZβTi(5-β)O12, wherein β represents a number greater than zero and less than or equal to 0.5, and Z represents at least one metal, said process comprising the steps of: a) preparing an intimately dispersed ternary mixture of TiOx—LizY-carbon, wherein
x is a number between 1 and 2,z is 1 or 2,Y is a radical chosen from the group consisting of CO3, OH, O and TiO3 or a mixture thereof, andthe carbon is a carbon powder selected from the group consisting of natural or artificial graphite, carbon black, Shawinigan black, Ketjen black and cokes; b) heating the dispersion at a temperature of between 400 and 1,000° C.; c) if appropriate, adding a source of at least one metal Z to the ternary mixture, wherein the operating conditions are chosen in such a way as to yield a conversion of the initial products respectively into Li4Ti5O12, Li(4-α)ZαTi5O12, Li4ZβTi(5-β)O12. |
