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A silicon-based @titanium niobium oxide core-shell structure negative electrode material and its preparation method

A technology of titanium niobium oxide and negative electrode materials, applied in the direction of negative electrodes, structural parts, active material electrodes, etc., can solve the problems of electrical conductivity, first-time Coulombic efficiency cycle performance defects, etc., and achieve reduced high-temperature solid phase reaction time and high capacity , the effect of inhibiting volume expansion

Active Publication Date: 2022-04-01
苏州宇豪纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a negative electrode material with a silicon-based@titanium-niobium oxide core-shell structure. The negative electrode material with a silicon-based@titanium-niobium oxide core-shell structure prepared by this method overcomes the existing Silicon-based negative electrode materials have defects in electrical conductivity, first Coulombic efficiency, and cycle performance, so that they can meet the requirements of practical applications

Method used

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  • A silicon-based @titanium niobium oxide core-shell structure negative electrode material and its preparation method
  • A silicon-based @titanium niobium oxide core-shell structure negative electrode material and its preparation method
  • A silicon-based @titanium niobium oxide core-shell structure negative electrode material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Put 1.53g of titanium dioxide into the dispersion tank, add 9.78g of niobium pentoxide (according to the molar ratio of titanium source and niobium source is 1:1.92); 200ml of deionized water, disperse and stir for 30min;

[0039] (2) Transfer the above-mentioned mixed solution to the dispersion tank of a sand mill, and after ball milling for 60 minutes, take the slurry and carry out a particle size test, and the particle size is 79nm;

[0040] (3) Take 130g of sio with a particle diameter of 5um, add it to the dispersion tank of the above-mentioned sand mill, and continue the ball milling for 2min to export the mixture;

[0041] (4) Use a low-temperature spray dryer to dry, the inlet temperature is 50°C, the feed rate is 50ml / min; the inlet pressure is 6MPa; the sio-titanium niobium oxide precursor is obtained;

[0042] (5) Forging the above-mentioned sio-titanium niobium oxide precursor: use argon protection, raise the temperature to 1100°C at a rate of 50°C / min, ...

Embodiment 2

[0050] (1) Put 1.82g of metatitanic acid into a dispersion tank, add 9.49g of niobium pentoxide (according to the molar ratio of titanium source and niobium source is 1:1.92); 200ml of deionized water, disperse and stir for 30min;

[0051] (2) Transfer the above-mentioned mixed solution to the dispersion tank of a sand mill, and after ball milling for 60 minutes, take the slurry and carry out a particle size test, and the particle size is 80nm;

[0052] (3) Take 130g of sio with a particle diameter of 5um, add it to the dispersion tank of the above-mentioned sand mill, and continue the ball milling for 2min to export the mixture;

[0053] (4) Use a low-temperature spray dryer to dry, the inlet temperature is 50°C, the feed rate is 50ml / min; the inlet pressure is 6MPa; the sio-titanium niobium oxide precursor is obtained;

[0054] (5) Forging the above-mentioned sio-titanium niobium oxide precursor: use argon protection, raise the temperature to 1100°C at a rate of 50°C / min, an...

Embodiment 3

[0056] (1) Put 1.4g of metatitanic acid into a dispersion tank, add 7.3g of niobium pentoxide (according to the molar ratio of titanium source and niobium source is 1:1.92); 150ml of deionized water, disperse and stir for 30min;

[0057] (2) Transfer the above-mentioned mixed solution to the dispersion tank of the sand mill, after ball milling for 50min, take the slurry and carry out the particle size test, the particle size is 85nm;

[0058] (3) Take 100g of si with a particle size of 200nm, add it to the dispersion tank of the above-mentioned sand mill, and continue the ball milling for 2min to export the mixture;

[0059] (4) Use a low-temperature spray dryer to dry, the inlet temperature is 50°C, the feed rate is 50ml / min; the inlet pressure is 6MPa; the si-titanium niobium oxide precursor is obtained;

[0060] (5) Forging the above si-titanium niobium oxide precursor: use argon protection, raise the temperature to 1100°C at a rate of 50°C / min, and keep it for 30 minutes; ...

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Abstract

The invention relates to the technical field of lithium-ion batteries, and provides a negative electrode material with a silicon-based@titanium-niobium oxide core-shell structure and a preparation method thereof, which uses titanium source and niobium source as raw materials for the coating layer, and passes the two materials through a sand mill. The former is prepared into a nano-suspension, and then nano-micron-sized silicon-based particles are uniformly dispersed in the above-mentioned suspension; then granulated by low-temperature rapid drying technology, and finally processed by a specific high-temperature forging to obtain a good particle size distribution A uniform silicon-based negative electrode material coated with nano-titanium niobium oxide. Titanium niobium oxide is used as a coating layer, on the one hand, it has a high capacity; on the other hand, as a coating layer, it can not only inhibit the volume expansion caused by silicon-based materials in lithium ion deintercalation, but also avoid the silicon-based particles and electrolysis. The direct contact with the liquid is beneficial to form a stable SEI film and improve the first effect, multiplier and cycle stability of the material; the method of the invention is environmentally friendly and pollution-free, simple and easy to realize, and can be industrialized.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a negative electrode material with a silicon-based@titanium-niobium oxide core-shell structure formed by coating silicon-based particles with titanium-niobium oxide and a preparation method thereof. Background technique [0002] With the emergence of energy problems, there is an urgent need for green energy lithium-ion batteries used in electric vehicles and energy storage. Traditional graphite negative electrode (specific capacity 372mAh / g) batteries are difficult to meet the needs of electric vehicles with long cruising range. Therefore, a series of high-capacity negative electrode materials have been extensively studied, among which Si-based materials are due to their high capacity (Si theoretical capacity 4200mAh / g, SiO theoretical capacity 2600mAh / g) and low lithium potential (0.1V vs Li / Li+), It shows a high application prospect in the field of lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/0525
CPCH01M4/366H01M4/386H01M4/483H01M10/0525H01M2004/027Y02E60/10
Inventor 李敏柳盼盼陈得强
Owner 苏州宇豪纳米材料有限公司
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