The invention discloses a preparation method of
lithium titanate composite negative
electrode materials used by
lithium ion batteries, which is characterized in that the method comprises the following steps: proportionally mixing Li2CO3
powder and TiO2
powder; then, adding organic solvents into the mixture to be simultaneously prepared into paste materials;
drying the paste materials after ball milling; raising the temperature; preserving the temperature; carrying out ball milling after cooling to obtain Li4Ti5O12; adding Li4Ti5O12 into
metal compounds to simultaneously carry out ball milling; and then, completing the preparation through
drying, temperature rising, temperature preservation, cooling and fine
grinding. The
lithium titanate of the composite negative
electrode materials of the lithium
ion batteries prepared by the method of the invention can adopt a general formula of Li4Ti5O12 / MOx, wherein x is 1 when M is Cu, and x is 0 when M is Ag. The
lithium titanate can be used as the negative
electrode materials of the lithium
ion batteries, and has the advantages of good
fast charging and discharging capability, high safety performance, no
pollution and excellent large-
magnification charging and discharging performance. The invention is applicable to industrial production, and can be applied to the fields of electric automobiles, energy storing equipment and electric tools.