Lithium titanate for lithium ion battery negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve problems such as poor specific capacity and cycle stability, improve discharge rate and cycle performance, improve electronic conductivity, and enhance conductivity Effect
CN101764207AInactive Publication Date: 2010-06-30HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HEFEI UNIV OF TECH
Publication Date
2010-06-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses lithium titanate for a lithium ion battery negative electrode material and a preparation method thereof. The preparation method is characterized by comprising the following steps of: mixing titanium dioxide with a lithium source in a molar ratio of 5:4.2; based on the total mass of the titanium dioxide and the lithium source, adding 5 to 15 percent of carbonaceous organic material and 2 to 5 percent of metal compound; adding alcohol or acetone into the mixture to stir into paste and ball-milling uniformly; drying the mixture and raising the temperature in air atmosphere to 600 to 750 DEG C at a rate of 3 to 5 DEG C per minute and preserving the heat for 6 to 12 hours; then raising the temperature to 800 to 900 DEG C and preserving the heat for 16 to 24 hours; and cooling the mixture to obtain doped lithium titanate Li4-xMxTi5O12, wherein M is metal Fe, Mg, Mn, Ag, Al, V, Sn or Cu; and x is less than or equal to 0.3 and more than or equal to 0.05. The lithium titanate can be used as the negative electrode material of the lithium ion battery, has the advantages of good rapid charge / discharge capacity, high safety performance, no pollution and excellent large-power charge / discharge performance, is suitable for industrialized production, and can be applied in the fields of electric automobiles, energy storage equipment and electric tools.
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Description

technical field

[0001] The invention belongs to the technical field of preparation methods of lithium titanate, and in particular relates to lithium titanate used as a lithium ion battery negative electrode material and a preparation method thereof. Background technique

[0002] "Fine Chemical Industry" (2007: 24, 3, 273-277 pages) introduced a method for solid-phase synthesis of lithium titanate, according to Li 3.85 Mg 0.15 Ti 5 o 12 The content ratio of lithium to titanium and magnesium in the formula is to weigh the lithium source, titanium dioxide and magnesium hydroxide, grind and mix them thoroughly, put the mixture in a muffle furnace, grind it after calcining at 600°C for 4 hours, and then calcining at 900°C for 12 hours , cooled naturally to room temperature, placed in a mortar, pulverized and finely ground to obtain the target product. When the lithium titanate is used as a lithium ion battery negative electrode material, its discharge specific capacity is low...

Claims

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