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Lithium titanate composite electrode material with fluoride surface coating layer and preparation method thereof

A surface coating, composite electrode technology, applied in battery electrodes, circuits, electrical components and other directions, can solve the problems of flatulence, poor rate performance, not built in, and achieve the effect of simple process, good rate performance, and flatulence inhibition.

Inactive Publication Date: 2013-12-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two major problems in the practical application of spinel-type lithium titanate as the anode material of lithium-ion batteries: poor rate performance due to being an insulator material; and flatulence caused by interface reaction with the electrolyte
The above methods all have certain advantages, but there are still certain problems in the above methods in terms of actual process operation and cost control. More importantly, the above methods do not seem to be based on a deep understanding of the principle of lithium titanate flatulence Therefore, it is necessary to propose a more advanced method of suppressing flatulence on the basis of clarifying the principle of lithium titanate flatulence

Method used

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  • Lithium titanate composite electrode material with fluoride surface coating layer and preparation method thereof
  • Lithium titanate composite electrode material with fluoride surface coating layer and preparation method thereof
  • Lithium titanate composite electrode material with fluoride surface coating layer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028]Weigh 0.4445 g of aluminum nitrate and dissolve it in 100 mL of secondary deionized water, stir well to form a concentration of 1.19×10 -2 mol / L stable solution. Then add 5.000 g of lithium titanate to the above solution, continue stirring to form a uniform suspension with a concentration of 50.00 g / L, and define this suspension as A. Weigh 0.1323 g of ammonium fluoride and dissolve it in 50 mL of secondary deionized water to form a concentration of 7.14×10 -2 moL / L stable solution, and define this solution as B. Add solution B dropwise into suspension A at a rate of 1 mL / min, heat at 80 °C for 5 h, let stand, settle, and remove water at 100 °C to obtain a dry aluminum fluoride-coated lithium titanate precursor. The precursor was placed in a nitrogen atmosphere and calcined at 400 °C for 5 h to prepare an aluminum fluoride-coated lithium titanate composite electrode material with an aluminum fluoride coating layer of about 2% by mass. The electrode material was asse...

Embodiment 2

[0030] Weigh 44.45 g of aluminum nitrate and dissolve it in 1000 mL of secondary deionized water, stir well to form a stable solution with a concentration of 0.119 mol / L. Then add 500 g of lithium titanate to the above solution, continue stirring to form a uniform suspension with a concentration of 500 g / L, and define this suspension as A. Weigh 13.23 g of ammonium fluoride and dissolve it in 500 mL of secondary deionized water to form a stable solution with a concentration of 0.714 moL / L, and define this solution as B. Add solution B dropwise into suspension A at a rate of 10 mL / min, heat at 80 °C for 10 h, let stand, settle, and remove water at 100 °C to obtain a dry aluminum fluoride-coated lithium titanate precursor. The precursor was placed in a nitrogen atmosphere and calcined at 400 °C for 10 h to prepare an aluminum fluoride-coated lithium titanate composite electrode material with an aluminum fluoride coating layer of about 2% by mass. The aluminum fluoride-coated li...

Embodiment 3

[0032] Weigh 0.1196 g of strontium nitrate and dissolve it in 100 mL of secondary deionized water to form a concentration of 5.65×10 -3 mol / L stable solution. Then add 2.2958 g of lithium titanate to the above solution, ultrasonically and mechanically stir to form a uniform suspension with a concentration of 22.958 g / L, and define this suspension as A. Next, weigh 0.0418 g of ammonium fluoride and dissolve it in 10 mL of secondary deionized water to form a concentration of 11.30×10 -2 moL / L stable solution, and define this solution as B. Solution B was added dropwise into suspension A at a rate of 1 mL / min, allowed to stand, settle, and remove water at 90°C to obtain a dry strontium fluoride-coated lithium titanate precursor. The precursor was placed in a nitrogen atmosphere and calcined at 400 °C for 2 h to prepare strontium fluoride-coated titanic acid with a coating thickness of about 5 nm and a mass percentage of strontium fluoride coating of about 3%. Lithium com...

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Abstract

The invention discloses a lithium titanate composite electrode material with a fluoride surface coating layer and a preparation method thereof. The coating layer of the composite electrode material is fluoride (MxFy) of one or more types of metals, wherein M is lithium, magnesium, strontium, barium, aluminum or lead, the thickness of the coating layer is 0.1-100nm, the coating layer accounts for 0.01-20% of the mass ratio of the composite electrode material, and lithium titanate is a crystal material with a spinel structure. According to the preparation method, a water-soluble salt of M and ammonium fluoride are used as raw materials, and n the surface of lithium titanate is in situ coated with fluoride through in situ chemical reaction deposition in combination with inert atmosphere heat treatment. The coating layer of the composite electrode material can shield active spots on the surface of the lithium titanate electrode material so that the lithium titanate electrode material can not bloat and has the advantages of good rate performance, high capacity retention ratio and excellent cycle performance; and the lithium titanate composite electrode material is simple and convenient in process, low in cost and suitable for large-scale production and has a wide market prospect.

Description

technical field [0001] The invention relates to a fluoride-coated lithium titanate composite electrode material and a preparation method for solving the flatulence problem of a lithium ion battery using lithium titanate as a negative electrode material, and belongs to the field of energy and new materials. Background technique [0002] Compared with lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries, lithium-ion batteries have the advantages of high working voltage, high energy density, less pollution, and no memory effect, so they are widely used in electronic products, power tools and mobile phones. . With the improvement of production and living standards and increasing attention to environmental pollution, the current green and environmentally friendly electric vehicles (EV) powered by lithium-ion batteries or auxiliary power have begun to be advocated, paid attention to and gradually entered people's lives. At the same time, a large number ...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/1315H01M4/13915H01M10/42
CPCY02E60/10
Inventor 李星瞿美臻
Owner SOUTHWEST PETROLEUM UNIV
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