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Lithium-ion battery anode active material li 2 Znti 3 o 8 preparation method

A negative electrode active material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation steps and high cost, and achieve the effect of reduced agglomeration and uniform distribution

Inactive Publication Date: 2017-07-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of Li with higher specific capacity, good high rate performance and cycle stability 2 ZnTi 3 o 8 Lithium-ion battery anode active material, overcomes the use of high-cost titanium isopropoxide and the preparation of complex TiO 2 Disadvantages such as high cost of nanorods / wires and complicated preparation steps

Method used

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  • Lithium-ion battery anode active material li <sub>2</sub> Znti <sub>3</sub> o <sub>8</sub> preparation method
  • Lithium-ion battery anode active material li <sub>2</sub> Znti <sub>3</sub> o <sub>8</sub> preparation method
  • Lithium-ion battery anode active material li <sub>2</sub> Znti <sub>3</sub> o <sub>8</sub> preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 1.8568g analytically pure zinc acetate, dissolve it in 50mL of organic solvent absolute ethanol, stir to fully dissolve it to form a transparent liquid, called solution A; then add 5.3586g analytically pure citric acid solid to solution A to form White flocculent sediment, magnetic stirring for 0.5-1h, citric acid and Zn in the precursor 2+ And Li + The molar ratio of the sum is controlled at: citric acid / (Zn 2+ And Li + )=1.0-1.5, this liquid mixture is called B; then add 0.6281g analytically pure lithium carbonate to B, stir for 0.5-1h, then add 8.6792g analytically pure tetrabutyl titanate liquid dropwise, magnetically stir 1-2h, obtain a light yellow transparent liquid mixture, called solution C, continue to stir for 0.5-1h; then transfer solution C to a constant temperature oil bath at 80 ℃ and magnetically stir until a wet gel is formed, and drum it at 80 ℃ Bake it in an air drying oven for 24 hours to fully dry it, then grind it into a light yellow solid powd...

Embodiment 2

[0037] Weigh 1.8568g analytically pure zinc acetate, dissolve it in 50mL of organic solvent absolute ethanol, stir to fully dissolve it to form a transparent liquid, called solution A; then add 5.3586g analytically pure citric acid solid to solution A to form White flocculent sediment, magnetic stirring for 0.5-1h, citric acid and Zn in the precursor 2+ And Li + The molar ratio of the sum is controlled at: citric acid / (Zn 2+ And Li + )=1.0-1.5, this liquid mixture is called B; then add 0.6281g analytically pure lithium carbonate to B, stir for 0.5-1h, then add 8.6792g analytically pure tetrabutyl titanate liquid dropwise, magnetically stir 1-2h, obtain a light yellow transparent liquid mixture, called solution C, continue to stir for 0.5-1h; then transfer solution C to a constant temperature oil bath at 80 ℃ and magnetically stir until a wet gel is formed, and drum it at 80 ℃ Bake it in an air drying oven for 24 hours to fully dry it, then grind it into a light yellow solid powd...

Embodiment 3

[0039] Weigh 1.8568g analytically pure zinc acetate, dissolve it in 50mL of organic solvent absolute ethanol, stir to fully dissolve it to form a transparent liquid, called solution A; then add 5.3586g analytically pure citric acid solid to solution A to form White flocculent sediment, magnetic stirring for 0.5-1h, citric acid and Zn in the precursor 2+ And Li + The molar ratio of the sum is controlled at: citric acid / (Zn 2+ And Li + )=1.0-1.5, this liquid mixture is called B; then add 0.6281g analytically pure lithium carbonate to B, stir for 0.5-1h, then add 8.6792g analytically pure tetrabutyl titanate liquid dropwise, magnetically stir 1-2h, obtain a light yellow transparent liquid mixture, called solution C, continue to stir for 0.5-1h; then transfer solution C to a constant temperature oil bath at 80 ℃ and magnetically stir until a wet gel is formed, and drum it at 80 ℃ Bake it in an air drying oven for 24 hours to fully dry it, then grind it into a light yellow solid powd...

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Abstract

The invention relates to a preparation method for a lithium ion battery anode active material Li2ZnTi3O8, and aims at providing a Li2ZnTi3O8 lithium ion battery anode active material which has higher specific capacity and good high-rate performance and cycling stability. According to the technical scheme, tetrabutyl titanate, lithium carbonate, zinc acetate and complexing agents are mixed and stirred according to a certain order, in the gel forming process, mixing of the reactants at the molecular level is facilitated, so that the reactants can make full contact with precursors, and therefore the prepared material has the advantages that the particle size is in the nanometer range, dispersion is uniform, an obvious agglomeration phenomenon does not exist, and piling holes exist among particles. Accordingly, the structural features are beneficial for the development of the high-rate performance and long cycling performance of the active material.

Description

[0001] Technical field: [0002] The invention belongs to the field of lithium ion batteries, and specifically relates to a rechargeable lithium ion battery negative electrode active material Li 2 ZnTi 3 O 8 The preparation method. [0003] Background technique: [0004] With the development of electronic consumer products such as smart phones and tablet computers towards large-size screens, the requirements for the endurance of rechargeable batteries are getting higher and higher. Since Sony Corporation of Japan first commercialized lithium-ion batteries in 1990, lithium-ion batteries have been widely used in various portable electronic devices due to their high output voltage, high energy density, long service life, environmental friendliness and no memory effect. In addition, lithium-ion batteries can also be used in many fields such as pure electric vehicles, hybrid vehicles, large-scale energy storage systems, and aerospace. For commercialized lithium-ion batteries, graphite-li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/485H01M10/0525Y02E60/10
Inventor 唐致远唐好庆罗加严
Owner TIANJIN UNIV
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