Negative electrode material for Li-ion batteries

US8486309B2 · kind B2 · utility

Assignees

• UMICORE · BE
• CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE · FR
• SAFT GROUPE SA · FR
• Université Montpellier · FR

Inventors

• Stephane Levasseur · Brussels, BE
• Cécile Tessier · Bruges, FR
• Josette Olivier-Fourcade · Jacou, FR
• Laure Monconduit · Jacou, FR
• Costana Ionica-Bousquet · Montpellier, FR
• Claire Villevieille · Marguerittes, FR
• Michèle Van Thournout · Liège, BE

Key dates

• Filing date: Nov 19, 2008
• Grant date: Jul 16, 2013
• Expiry date: Sep 4, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An active material for a lithium battery electrode comprises a phase having the formula Li2+v−4cCcTi3−wFexMyM′zO7−α, 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 α being associated by the relationships: 2α=−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(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.