Preparation method of lithium titanium silicate anode material for lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of lithium-ion battery operating voltage reduction, cycle performance degradation, high charge and discharge platform, etc., to achieve good electrochemical performance Performance, low cost, and the effect of improving energy storage performance

Active Publication Date: 2015-11-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the only commercial anode material is carbon material, but its low theoretical specific volume limits its further development.
Both tin-based and silicon-based materials are faced with the problems of low conductivity and large volume effect during charging and discharging, which makes the cycle performance of such materials decrease.
Although the volume effect of titanate material is small, its charging and discharging platform is relatively high. When using this type of material as an active material, the working voltage of lithium-ion batteries will decrease.

Method used

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  • Preparation method of lithium titanium silicate anode material for lithium ion battery
  • Preparation method of lithium titanium silicate anode material for lithium ion battery
  • Preparation method of lithium titanium silicate anode material for lithium ion battery

Examples

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Embodiment 1

[0029] A preparation method of titanium silicate lithium lithium ion battery negative electrode material of the present invention, comprises the following steps:

[0030] 1) Take by weighing 2.4960g of lithium chloride, 5.5853g of silicon tetrachloride and 5.0017g of titanium tetrachloride, after being dissolved in 15ml of absolute ethanol respectively, mix the three together, and stir evenly to obtain mixture.

[0031] 2) Add hydrochloric acid to the mixed solution under constant stirring to adjust the pH value of the system to 5.5.

[0032] 3) The mixed solution after step 2) was transferred into a three-necked flask, and then water vapor at 100° C. was carried by nitrogen gas and then passed into the mixed solution at a rate of 0.5 L / min for hydrolysis reaction to obtain a white coprecipitate. Suction filtration was performed with a vacuum filter, and the obtained coprecipitate was repeatedly washed 3 times with deionized water. Transfer the washed co-precipitate into an ...

Embodiment 2

[0037] A preparation method of titanium silicate lithium lithium ion battery negative electrode material of the present invention, comprises the following steps:

[0038] 1) Weigh 5.0969g of lithium acetate, 8.1790g of tetrabutyl titanate and 5.0533g of tetraethyl orthosilicate, respectively dissolve them in 15ml of absolute ethanol, then mix the three together and stir evenly , to obtain a mixed solution.

[0039] 2) Add glacial acetic acid to the mixed solution under constant stirring to adjust the pH value of the system to 3.5.

[0040] 3) The mixed solution after step 2) was transferred into a three-necked flask, and then water vapor at 120° C. was passed into the mixed solution at a rate of 1.0 L / min through nitrogen gas to carry out hydrolysis reaction to obtain a white coprecipitate. Suction filtration was performed with a vacuum filter, and the obtained coprecipitate was repeatedly washed 3 times with deionized water. Transfer the washed co-precipitate into an oven a...

Embodiment 3

[0044] A preparation method of titanium silicate lithium lithium ion battery negative electrode material of the present invention, comprises the following steps:

[0045] 1) Weigh 4.5206g of lithium oxalate, 6.6941g of titanium tetraisopropoxide and 4.1995g of methyl triethoxy silicon, dissolve them in 15ml of absolute ethanol respectively, mix the three together, and stir Evenly, a mixed solution was obtained.

[0046] 2) Add oxalic acid to the mixed solution under constant stirring to adjust the pH value of the system to 2.5.

[0047] 3) The mixed solution after step 2) was transferred into a three-necked flask, and then water vapor at 150° C. was passed into the mixed solution at a rate of 1.5 L / min through nitrogen carrier flow to carry out hydrolysis reaction to obtain a white coprecipitate. Suction filtration was performed with a vacuum filter, and the obtained coprecipitate was repeatedly washed 3 times with deionized water. Transfer the washed co-precipitate into an ...

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Abstract

The invention discloses a preparation method of lithium titanium silicate anode material for a lithium ion battery. The method specifically comprises the following steps: 1) dissolving a lithium salt, a titanium source and a silicon source into an organic solvent, and uniformly mixing the lithium salt, titanium source and silicon source to obtain a mixed solution; (2) adjusting the pH value of the mixed solution to 1.5-6.5; (3) introducing water vapor carried by a carrier gas into the mixed solution obtained in the step (2) to perform a hydrolysis reaction in order to obtain a co-precipitate, and performing filtering, water washing and drying to obtain a precursor; and (4) pre-burning the precursor in an inert protection atmosphere at the temperature of 450-700 DEG C for 3-5 hours, and sintering the pre-burned precursor at the temperature of 750-950 DEG C to obtain the lithium titanium silicate anode material for the lithium ion battery. The anode material prepared with the preparation method is ideal in shape and particle size distribution, and has high electrochemical performance. The preparation method is simple in flow, high in operability, high in safety, and convenient for realizing industrialization.

Description

technical field [0001] The invention relates to a preparation method of a battery material, in particular to a preparation method of a novel lithium titanium silicate lithium ion battery negative electrode material. Background technique [0002] With the strong rise of solar energy, wind energy and other new energy generation and storage in countries around the world, as well as the rapid development of power grid structure adjustment, distributed power generation, and micro-grid technology in various countries, energy storage technology has become an inevitable choice for the future development of the power industry. The large-scale application of electrochemical energy storage systems represented by batteries and supercapacitors has become indispensable in the development of power grid peak-shaving and valley-filling, elimination of garbage batteries, improvement of grid quality, voltage regulation and frequency modulation, off-grid operation, and micro-grid technology. Ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525C01B33/20
CPCC01B33/20H01M4/5825H01M10/0525Y02E60/10
Inventor 王志兴席昭郭华军李新海彭文杰胡启阳杨勇
Owner CENT SOUTH UNIV
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