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Lithium-ion battery negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low inter-particle bulk density, wide particle size distribution, poor charge-discharge performance, etc., and achieves a simple synthesis process, Low cost and the effect of improving capacity

Active Publication Date: 2020-06-05
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But also see TiO 2 Nanomaterials generally have shortcomings such as wide particle size distribution, low packing density between particles, and easy agglomeration during the electrode preparation process, resulting in poor charge and discharge performance, so excellent TiO 2 Lithium-ion battery anode materials are still being explored

Method used

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  • Lithium-ion battery negative electrode material and preparation method thereof
  • Lithium-ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare solution A: 9 mL 28% concentrated ammonia water + 16.25 mL ethanol + 24.75 mL water + 0.02 gCTAB, put in a beaker, stir magnetically for 15 min until the solution is evenly mixed, then add TiO 2 Nanoparticles (P25) 0.1 g, ultrasonically dispersed for 20 min.

[0025] Prepare solution B: 4.5 mL tetraethyl orthosilicate (TEOS) + 45.5 mL ethanol, mix well.

[0026] Quickly add solution B into the vigorously stirred solution A, seal the mouth of the beaker with plastic wrap, continue to stir and react at room temperature for 2 h, and the product SiO 2 The bag P25 was centrifuged and washed 3 times with absolute ethanol. The cleaned SiO 2 The package P25 was again placed in the mixed solution of absolute ethanol and deionized water, and 2 mL of isopropyl titanate (TIP) was added dropwise under the condition of vigorous stirring. Product TiO 2 Pack SiO 2 @P25. TiO 2 Pack SiO 2 @P25 Place in deionized water, heat to 95°C, keep warm for 2-10 hours, pour off the ...

Embodiment 2

[0032] Prepare solution A: 9 mL 28% concentrated ammonia water + 16.25 mL ethanol + 24.75 mL water + 0.02 gCTAB, put in a beaker, stir magnetically for 15 min until the solution is evenly mixed, then add TiO 2 Nanoparticles (P25) 0.2 g, ultrasonically dispersed for 20 min.

[0033] Prepare solution B: 4.5 mL tetraethyl orthosilicate (TEOS) + 45.5 mL ethanol, mix well.

[0034] The solution B was quickly added to the vigorously stirred solution A, the opening of the reaction beaker was sealed with plastic wrap, and the stirring reaction was continued at room temperature for 2 h. The product SiO 2 Pack P25 for centrifugation, wash with absolute ethanol for 3 times, and clean the SiO 2 The package P25 was placed in the mixed solution of absolute ethanol and deionized water again, under the condition of vigorous stirring, 1 mL of isopropyl titanate (TIP) was added dropwise, and the stirring reaction was continued for 30 min after the dropwise addition, and then the product was s...

Embodiment 3

[0038] Prepare solution A: 9 mL 28% concentrated ammonia water + 16.25 mL ethanol + 24.75 mL water + 0.02 gCTAB, put in a beaker, stir magnetically for 15 min until the solution is evenly mixed, then add TiO 2 Nanoparticles (P25) 0.5 g, ultrasonically dispersed for 20 min.

[0039] Prepare solution B: 4.5 mL tetraethyl orthosilicate (TEOS) + 45.5 mL ethanol, mix well.

[0040] Quickly add solution B to the vigorously stirred solution A, seal the mouth of the reaction beaker with plastic wrap, continue to stir and react at room temperature for 2 h, and the product SiO 2 The bag P25 was centrifuged and washed 3 times with absolute ethanol. The cleaned SiO 2 The package P25 was placed in the mixed solution of absolute ethanol and deionized water again, and 0.2 mL of isopropyl titanate (TIP) was added dropwise under the condition of vigorous stirring. Product TiO 2 Pack SiO 2 @P25. TiO 2 Pack SiO 2 @P25 Place in deionized water, heat to 95°C, keep warm for 2-10 hours, pour...

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Abstract

The invention discloses a TiO2 hollow mesoporous spherical shell coating TiO2 nanoparticle lithium ion battery cathode material and a preparation method thereof, and belongs to the technical field oflithium ion batteries. The preparation method of the lithium ion battery cathode material comprises the steps of coating a layer of SiO2 on the surfaces of TiO2 nanoparticles P25 through a classic stober method, then coating the surface of the SiO2 with a layer of TiO2 through an isopropyl titanate hydrolyzing method and removing the SiO2 layer to obtain the TiO2 hollow mesoporous spherical shellcoating TiO2 nanopartile material. When the TiO2 hollow mesoporous spherical shell coating TiO2 nanoparticle disclosed by the invention is used as the lithium ion battery cathode material, the TiO2 hollow mesoporous spherical shell coating TiO2 nanoparticle shows a good charge-discharge property and cycling stability. The preparation method disclosed by the invention has the advantages of simple synthesizing technology, moderate reaction condition, lower cost and suitability for large-scale synthesis.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a TiO 2 Hollow mesoporous spherical shell with TiO 2 Nano particle lithium ion battery negative electrode material and preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long service life, safety and stability, and environmental friendliness. They have broad application prospects in many fields such as mobile devices, green transportation, and energy storage. In recent years, the rapid development of smart electronic devices has put forward higher requirements for power supplies, which urgently require power supplies with high energy density and power density, long cycle life, and good performance. The current commercial lithium-ion batteries can no longer fully meet the market demand. It is very important to develop high-performance electrodes and electrode materials to improve the elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M10/0525C01G23/08C01G23/047C01G23/053B82Y30/00
CPCB82Y30/00C01G23/047C01G23/053C01G23/08C01P2004/32C01P2004/34C01P2004/62C01P2004/64C01P2006/17H01M4/366H01M4/48H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 严微微
Owner CHINA JILIANG UNIV
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