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Modified lithium titanate and preparation method thereof

The unique technology of lithium titanate and lithium molybdate titanate is applied in the field of modified lithium titanate and its preparation, which can solve the problems of poor high rate performance, low battery voltage, poor electronic conductivity, etc., and achieve high specific capacity and cost. Moderate, stable performance

Inactive Publication Date: 2012-06-13
MCNAIR TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium titanate has poor electronic conductivity and a relatively high voltage platform. As a negative electrode material, the battery voltage is reduced and the high rate performance is poor.

Method used

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  • Modified lithium titanate and preparation method thereof
  • Modified lithium titanate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A modified lithium titanate and preparation method thereof:

[0027] According to the molecular formula Li 4 Ti 4.98 Mo 0.02 o 12 Weigh respectively 0.8645g of titanium dioxide, 0.3469g of lithium carbonate, 0.0063g of molybdenum trioxide, 0.2145g of citric acid, ball mill for 10h, 800°C, calcined for 8h under a nitrogen atmosphere in a tube furnace, grind, and pass through a 150-mesh sieve to obtain the lithium ion Battery negative electrode material modified lithium titanate products.

Embodiment 2

[0029] A modified lithium titanate and preparation method thereof:

[0030] According to the molecular formula Li 4 Ti 4.98 Mo 0.02 o 12 Weigh 0.8645g of titanium dioxide, 0.2249g of lithium hydroxide, 0.0078g of ammonium molybdate, and 0.1548g of glucose, ball mill for 1h, calcine at 1000°C for 6h under a nitrogen atmosphere in a tube furnace, grind, and pass through a 150-mesh sieve to obtain the lithium ion Battery negative electrode material modified lithium titanate products.

Embodiment 3

[0032] A modified lithium titanate and preparation method thereof:

[0033] According to the molecular formula Li 4 Ti 4.98 Mo 0.02 o 12 Weigh 0.8645g of titanium dioxide, 0.6474g of lithium nitrate, 0.0078g of ammonium molybdate, 0.102g of sucrose and 0.0825g of glucose, ball mill for 20h, calcine at 600°C for 20h under a nitrogen atmosphere in a tube furnace, grind, pass through a 150-mesh sieve, and obtain the Described lithium ion battery negative electrode material modified lithium titanate product.

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Abstract

The invention relates to the technical field of battery materials and in particular relates to a preparation method of modified lithium titanate. The modified lithium titanate comprises a lithium source, a titanium source, a carbon source and a molybdenum source. A preparation process of the modified lithium titanate comprises the following steps of: mixing the lithium source, the titanium source, the molybdenum source and the carbon source, and performing ball milling; and calcining the mixture obtained through ball milling at 400-1,000 DEG C for 6-20 hours in the presence of inert gas in a tubular furnace. The modified lithium titanate is stable in performance and good in consistency; the preparation method is low in cost and simple in process, and can be applied to large-scale industrial production; and the obtained product is charged and discharged at 5C multiplying power, and the capacity is still as high as 118 mAh / g after 200 times of circulation.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a modified lithium titanate and a preparation method thereof. Background technique [0002] With the miniaturization and miniaturization of today's electronic equipment, the research and application of lithium-ion batteries are getting more and more attention. The traditional negative electrode material of lithium ion battery is carbon material. Although the carbon negative electrode has been successfully commercialized, the battery safety problems in it force people to look for safe and reliable new negative electrode materials that can intercalate lithium at a slightly positive potential than the carbon negative electrode. Among them, low-potential transition metal oxides and composite oxides have attracted widespread attention as negative electrode materials for lithium-ion batteries, especially the zero-strain material lithium titanate, with its 1.5V (vs.Li / Li + )...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/131
CPCY02E60/122Y02E60/10
Inventor 王浩李中延王利娟闫继唐致远罗永莉马莉刘东
Owner MCNAIR TECH
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