Preparation method of lithium titanate composite negative electrode materials used by lithium ion batteries

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor specific capacity and cycle stability, and achieve the effects of overcoming poor charge and discharge performance, reducing reaction time, and lowering reaction temperature

Inactive Publication Date: 2010-09-29
HEFEI UNIV OF TECH
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Problems solved by technology

[0004] The invention provides a preparation method of a lithium titanate composite negative electrode material for a lithium ion battery, to solve the problems of low rate discharge specific capacity and poor cycle stability of lithium titanate in the prior art, and to improve the rate charge and discharge performance of lithium titanate performance

Method used

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  • Preparation method of lithium titanate composite negative electrode materials used by lithium ion batteries
  • Preparation method of lithium titanate composite negative electrode materials used by lithium ion batteries
  • Preparation method of lithium titanate composite negative electrode materials used by lithium ion batteries

Examples

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Embodiment 1

[0027] According to Li 4 Ti 5 o 12 The mass ratio of each element in is taken as 1.458g Li respectively 2 CO 3 Powder, 3.65g TiO 2 Put the powder 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 90°C for 8 hours, then put it in a crucible and put it in a box-type sintering furnace, in the air atmosphere to Raise the temperature to 750°C at a heating rate of 4°C / min, keep it warm for 6 hours, then continue to heat up to 850°C, keep it warm for 18 hours, then cool to room temperature with the furnace, take out the sample and ball mill again to get Li 4 Ti 5 o 12 , the prepared Li 4 Ti 5 o 12 Weigh 3g, and add 0.03g of copper acetate with 1% of the mass, put it into a drum-type powder ball mill for ball milling for 12 hours, take it out and dry it in an oven at 90°C for 12 hours, then put it in a crucible and put it in a box-type sintering furnace. The air atmosphere is directl...

Embodiment 2

[0031] According to Li 4 Ti 5 o 12 The mass ratio of each element in is taken as 1.458g Li respectively 2 CO 3 Powder, 3.65g TiO 2 Put the powder and 10-20ml alcohol into the mixing tank, put it into a planetary ball mill for ball milling for 9 hours, take it out and dry it in an oven at 100°C for 8 hours, then put it in a crucible and put it in a box-type sintering furnace. Raise the temperature to 600°C at a heating rate of 4°C / min, hold for 8 hours, then continue to heat up to 800°C, hold for 20 hours, then cool to room temperature with the furnace, take out the sample and ball mill again to obtain Li 4 Ti 5 o 12 , the above-prepared Li 4 Ti 5 o 12 Weigh 3g, and add 0.075g of copper oxide with 2.5% of the mass, put it into a drum-type powder ball mill for ball milling for 12 hours, take it out and dry it in an oven at 90°C for 12 hours, then put it in a crucible and put it in a box-type sintering furnace. The air atmosphere is directly heated to 400°C, held at 6 h...

Embodiment 3

[0035] According to Li 4 Ti 5 o 12 The mass ratio of each element in 0.932g LiOH (lithium hydroxide) powder, 3.65g TiO 2 Put the powder and 10-20ml alcohol into the mixing tank, put it into a planetary ball mill for ball milling for 12 hours, take it out and dry it in an oven at 90°C for 9 hours, then put it in a crucible and put it in a box-type sintering furnace. Raise the temperature to 750°C at a heating rate of 4°C / min, keep it warm for 6 hours, then continue to heat up to 900°C, keep it warm for 16 hours, then cool to room temperature with the furnace, take out the sample and ball mill again to get Li 4 Ti 5 o 12 , the above-prepared Li 4 Ti 5 o 12 Weigh 3g, and add 0.12g of copper acetate with 4% of the mass, put it into a drum-type powder ball mill for ball milling for 12 hours, take it out and dry it in an oven at 90°C for 12 hours, then put it in a crucible and put it in a box-type sintering furnace. The air atmosphere is directly heated to 450°C, kept for 4 ...

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Abstract

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.

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] "Electrochemistry Communications" (2009, No. 11, pages 50-53) introduced a solid-phase synthesis of doped lithium titanate Li 4 Ti 5 Cu x o 12+x , according to the ratio of 4:5:x (x=0.6), weigh the lithium source, titanium dioxide and copper nitrate, add acetone to mix and ball mill for 48 hours, dry the mixture and place it in a muffle furnace, and calcinate it in an air atmosphere at 800°C After 12 hours, it was naturally cooled to room temperature, and then placed in a mortar, pulverized and finely ground to obtain the target product. When the doped copper lithium titanate is used as the negative electrode material of lithium-ion batteries, the first discharge capacity at 0.6C is 188.9mAh / g, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/485
CPCY02E60/122Y02E60/10
Inventor 朱继平赵俊杰王清松杨宏伟李缜
Owner HEFEI UNIV OF TECH
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