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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

Inactive Publication Date: 2010-06-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a lithium ion battery negative electrode material lithium titanate and preparation method thereof, to overcome the above-mentioned defects of the prior art, to solve the problems of low rate discharge specific capacity and cycle stability of existing lithium titanate, Improving the performance of lithium titanate charge and discharge rate

Method used

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

Examples

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Effect test

Embodiment 1

[0019] According to Li 3.95 Mg 0.05 Ti 5 o 12 The mass ratio of each element in is taken as 3gLi respectively 2 CO 3 Powder, 7.5gTiO 2 Put the powder, 0.03g MgO powder, 0.5g glucose and 10-20ml alcohol into the mixing tank, put it into a planetary ball mill for ball milling for 8 hours, take it out and dry it in an oven at 70°C, then put it in a crucible and put it in a box-type sintering furnace , raise the temperature to 650°C at a rate of 4°C / min in an air atmosphere, keep it warm for 6 hours, then continue to raise the temperature to 800°C, keep it warm for 18 hours, and then cool to room temperature with the furnace. Take out the sample and grind it until the particle size range is controlled at 1.5-4μm, and put it in a desiccator for later use.

[0020] The sample made above is analyzed through X-ray diffraction (instrument model is Philips X'Pert Pro Super X-ray diffractometer 2θ angle scanning range is 10-80 degree), obtain the X-ray diffraction pattern of the ...

Embodiment 2

[0023] According to Li 3.85 Mg 0.15 Ti 5 o 12 The mass ratio of each element in is taken as 1.962gLi 2 CO 3 Powder, 5.11gTiO 2 Put the powder, 0.075g of MgO powder, 1g of rock sugar and 10-20ml of alcohol into a mixing tank, put it into a planetary ball mill for ball milling for 8 hours, take it out and dry it in an oven at 80°C, then put it in a crucible and place it in a box for sintering In the furnace, heat up to 700°C for 8 hours at a rate of 4°C / min in the air atmosphere, then continue to heat up to 850°C and calcinate in the air atmosphere for 20 hours, take out the sample and grind it finely, and the particle size range is controlled at 1.5-4μm. The obtained sample was a yellow powder.

[0024] The battery was assembled and tested according to the same method as in Example 1, and the test results obtained were: the discharge capacity reached 179mAh / g at 0.5C, 150mAh / g at 1C, and 133mAh / g at 5C, and the data at 10C For discharging 120mAh / g, the capacity retention r...

Embodiment 3

[0027] According to Li 3.7 al 0.3 Ti 5 o 12 The mass ratio of each element in is taken as 2g LiNO 3 Powder, 5gTiO 2 Powder, 0.2gAl 2 o 3 Put the powder, 1.5g of citric acid and 10-20ml of alcohol into a mixing tank, put it into a planetary ball mill for ball milling for 8 hours, take it out, dry it in an oven at 90°C, put it in a crucible and place it in a box-type sintering furnace In the air atmosphere, heat up to 600°C at a heating rate of 3°C / min for 10 hours, then continue to heat up to 900°C for 24 hours in an air atmosphere, take out the sample and grind it finely, and the particle size range is controlled at 1.5-4μm.

[0028] Carry out battery assembly and testing according to the same method as in Example 1, it is obtained that the discharge capacity reaches 176mAh / g at 0.5C, 148.6mAh / g at 1C, 134mAh / g at 5C, and 119.2mAh at 10C / g, the obtained data is close to Example 2. It can be seen that the doped lithium titanate material prepared in this example has goo...

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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.

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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Application Information

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IPC IPC(8): H01M4/04H01M4/58
CPCY02E60/12Y02E60/10
Inventor 朱继平段文升蒋阳郭超杨光刘志芬
Owner HEFEI UNIV OF TECH
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