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Lithium titanate cathode material and preparation method thereof and lithium ion battery using lithium titanate cathode material

A negative electrode material, lithium titanate technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of easy gas production, affecting the performance stability of lithium-ion batteries, etc., to reduce the contact interface, reduce the reaction, good The effect of performance stability

Active Publication Date: 2013-03-27
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, lithium-ion batteries using lithium titanate as the negative electrode active material have the following defects: easy to produce gas at high temperature, which affects the stability of lithium-ion battery performance

Method used

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  • Lithium titanate cathode material and preparation method thereof and lithium ion battery using lithium titanate cathode material
  • Lithium titanate cathode material and preparation method thereof and lithium ion battery using lithium titanate cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Heat 0.2L of deionized water to 40°C, add 2g of potassium fluozirconate (K 2 ZrF 6 ), after dissolving, add 0.2g reaction auxiliary boric acid (H 3 BO 3 ), add 100g lithium titanate (Li 4 Ti 5 o 12 ) powder, react at a constant temperature for 9 hours to obtain a hydrolysis reaction product; wash the reaction product and dry it in an oven at 85°C for 4 hours, then place it in a muffle furnace and raise the temperature to 600°C, and keep the temperature constant for 7 hours. Cool naturally to room temperature to obtain a lithium titanate negative electrode material coated with zirconium oxide.

[0029] Use EDS to test the zirconium element of the lithium titanate negative electrode material obtained according to embodiment 1, and its surface test and point test patterns are respectively as follows figure 1 and figure 2 As shown, the mass percentage of zirconium oxide is 0.84%.

[0030] Using the lithium titanate negative electrode material of Example 1 of the pr...

Embodiment 2

[0032] Heat 0.2L of deionized water to 80°C, add 10g of sodium metaaluminate (NaAlO 2 ), after dissolving, add 0.5g reaction auxiliary acetic acid (CH 3 COOH), add 100g lithium titanate (Li 4 Ti 5 o 12 ) powder, react at a constant temperature for 1 hour to obtain a hydrolysis reaction product; wash the reaction product and place it in an oven at 140° C. to dry for 4 hours, then place it in a muffle furnace and raise the temperature to 800° C. Cool naturally to room temperature to obtain a lithium titanate negative electrode material coated with aluminum oxide. The mass percent content of aluminum oxide is 6.1%.

[0033] The preparation and storage test of the lithium-ion battery are the same as in Example 1, and the test results show that the thickness expansion of the lithium-ion battery using the lithium titanate negative electrode material coated with aluminum oxide on the surface of Example 2 of the present invention as the negative electrode active material is 11%. ...

Embodiment 3

[0035] Heat 0.2L of a mixed solvent of deionized water and ethanol (the mass ratio of deionized water to ethanol is 95:5) to 60°C, add 30g of magnesium chloride (MgCl 2 ), after dissolving, add 2.5g reaction auxiliary carbonic acid (H 2 CO 3 ), add 100g lithium titanate (Li 4 Ti 5 o 12 ) powder, react at a constant temperature for 5 hours to obtain a hydrolysis reaction product; wash the reaction product and dry it in an oven at 180°C for 2 hours, then place it in a muffle furnace and raise the temperature to 900°C, and keep the temperature constant for 1 hour. Cool naturally to room temperature to obtain a lithium titanate negative electrode material coated with magnesium oxide. The mass percent content of magnesium oxide is 12.5%.

[0036]The preparation and storage test of the lithium-ion battery are the same as in Example 1. The test results show that the thickness expansion of the lithium-ion battery using the lithium titanate negative electrode material coated with ...

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Abstract

The invention discloses a lithium titanate cathode material. One or more types of metal oxide (MxOy) is coated on the surface of the lithium titanate cathode material, wherein M comprises one or more types of Al, Mg, Ga, Ge, Sn, Zr, Ca, Sb and In. Because the metal oxide (MxOy) is coated on the surface of the lithium titanate cathode material of the invention, the lithium titanate cathode material has good stability at high temperature. In addition, the invention also provides a preparation method of the lithium titanate cathode material and a lithium ion battery using the lithium titanate cathode material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium titanate negative electrode material and a preparation method thereof, and a lithium ion battery using the lithium titanate negative electrode material. Background technique [0002] Currently, the rapid development of electronic products, power tools, and mobile products requires high-performance batteries. Compared with lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries, lithium-ion batteries have the advantages of high operating voltage and high energy density, so they have been widely used. [0003] Lithium-ion batteries generally include: a positive electrode sheet, a negative electrode sheet, a separator spaced between the positive electrode sheet and the negative electrode sheet, and an electrolyte, wherein the positive electrode sheet includes a positive electrode current collector and a positive electrode active mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/1391H01M10/0525
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 许瑞韩昌隆付成华柳娜吴梦尧徐磊敏
Owner DONGGUAN AMPEREX TECH
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