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Modified lithium titanate material used for lithium ion battery and manufacturing method thereof

A lithium ion battery and lithium titanate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of restricting the growth of lithium titanate particles, difficulty in mass production of lithium titanate, etc., and achieve environmental control. Effect

Inactive Publication Date: 2012-01-25
青岛瀚博电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the deficiencies in the prior art, the present invention aims to provide a modified lithium titanate material for lithium ion batteries. Since the material is prepared by a molten salt method, the atmosphere of the molten salt limits the size of lithium titanate particles. Grow up, so that the particles are controlled at the nanometer level, while ensuring the consistency of the temperature and environment during the sintering process, and solving the difficult problem of mass production of lithium titanate

Method used

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  • Modified lithium titanate material used for lithium ion battery and manufacturing method thereof
  • Modified lithium titanate material used for lithium ion battery and manufacturing method thereof
  • Modified lithium titanate material used for lithium ion battery and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0047] Weigh 90g of lithium carbonate, 110g of anatase titanium dioxide, 20g of magnesium oxide, and 1000g of sodium chloride, respectively, and add them to a ball mill tank for grinding for 2 hours; use a cake press to form a cake; under nitrogen protection, grind the cake The material is placed in a tube-type sintering furnace and calcined at a temperature of 900°C for 5 hours, and then the sample is cooled to room temperature with the furnace temperature; the sintered block is placed in a ball mill and ground into a powder with a diameter of less than 10 microns , add water to wash twice, each time with 5000g of water; after filtering, use a blower to dry at 200°C for 2 hours to obtain the product modified lithium titanate.

Embodiment 2

[0049] Weigh 110g of lithium hydroxide, 90g of anatase titanium dioxide, 10g of silicon oxide, and 1500g of potassium chloride, and add them into a ball mill jar for grinding for 8 hours; The grinding material is placed in a tube-type sintering furnace and calcined for 10 hours at a temperature of 600°C, and then the sample is cooled to 150°C with the furnace temperature; the sintered block is placed in a ball mill and ground to a diameter less than 10 microns The powder was washed twice with water, each time with 6000 g of water; after filtration, it was dried with a blower at 100°C for 6 hours to obtain the product modified lithium titanate.

Embodiment 3

[0051] Weigh 2000g of lithium chloride, 100g of anatase titanium dioxide, and 5g of neodymium nitrate, and add them into a ball mill jar for grinding for 6 hours; press them into a cake shape with a cake press machine; In a sintering furnace with a temperature of 800 ° C for 7 hours, the sample was cooled to room temperature with the furnace temperature; the sintered block was ground into a powder with a diameter of less than 10 microns in a ball mill, and washed with water for two Each time, use 6500g of water each time; after filtering, use a blower to dry at 150°C for 4 hours to obtain the product modified lithium titanate.

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Abstract

The invention relates to a modified lithium titanate material used for a lithium ion battery and a manufacturing method thereof. The modified lithium titanate material is manufactured by the following steps through a molten-salt growth method: adopting a lithium source and a titanium source as raw materials and taking a molten salt as a fusing agent; doping a compound containing a magnesium element, an aluminum element, a neodymium element, a rubidium element, a gallium element, a cesium element, a silicon element, a tin element or a carbon element for modification; and grinding and calcining. The modified lithium titanate material has the advantages of nano particles, clear crystal structure and integral crystallization shape; the manufacturing method using the molten-salt growth method is used to ensure the homogeneity of products; and the electrical conductivity and cycle performance of the lithium ion battery with the modified lithium titanate cathode can be improved greatly.

Description

technical field [0001] The invention relates to the field of chemical energy materials, in particular to a modified lithium titanate material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries refer to the general term for batteries that use lithium ion intercalation compounds as electrode materials. Generally, carbon materials are used as negative electrodes, transition metal oxides are used as positive electrodes, and organic electrolyte solutions dissolved in lithium salts are used as electrolytes. The charging and discharging process of lithium-ion batteries is the insertion and extraction of lithium ions. [0003] At present, most commercial lithium-ion battery anode materials are lithium-intercalated carbon materials. Since the potential of the carbon electrode after lithium intercalation is very close to that of metal lithium, when the battery is overcharged, metal lithium is easily precipitated on the surfa...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 王金枝刘成全
Owner 青岛瀚博电子科技有限公司
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