A lithium ion battery negative electrode material in which TiO2 nanoparticles are embedded in a CoS hollow shell and a preparation method thereof

A lithium-ion battery and nanoparticle technology, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of low packing density between particles, wide particle size distribution, poor charge and discharge performance, etc., and achieve simple synthesis process and improved Ability, the effect of high conductivity

Active Publication Date: 2019-01-08
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • A lithium ion battery negative electrode material in which TiO2 nanoparticles are embedded in a CoS hollow shell and a preparation method thereof
  • A lithium ion battery negative electrode material in which TiO2 nanoparticles are embedded in a CoS hollow shell and a preparation method thereof
  • A lithium ion battery negative electrode material in which TiO2 nanoparticles are embedded in a CoS hollow shell and a preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Synthetic TiO 2 Nanoparticles: Add 0.2 mL of ammonia water to 10 mL of absolute ethanol, stir for 5 min, then add 0.1 mL of isopropyl titanate (TIP) under vigorous stirring, centrifuge after stirring for 10 min, and wash with absolute ethanol 3 times.

[0030] TiO with jujube cake structure 2 Nanoparticle embedded ZIF67: Dissolve 0.5 g PVP in 10 mL absolute ethanol, and then wash the TiO 2 Nanoparticles were dispersed in the PVP ethanol solution, stirred at room temperature for 24 h, washed with absolute ethanol three times, and then dispersed in 2.5 mL of methanol solution. Take 1.3 mL of TiO 2 The methanol solution was dropped into the methanol solution of cobalt nitrate with a volume of 50 mL and a concentration of 20 mM. After stirring for 3 min, a methanol solution of 2-methylimidazole with a volume of 80 mL and a concentration of 80 mM was quickly added, and the stirring was continued for 1 min. After standing for 12 h, the product was separated by centrifugat...

Embodiment 2

[0039] Synthetic TiO 2 Nanoparticles: Add 0.2 mL of ammonia water to 10 mL of absolute ethanol, stir for 5 min, then add 0.1 mL of isopropyl titanate (TIP) under vigorous stirring, centrifuge after stirring for 10 min, wash with absolute ethanol for 3 Second-rate.

[0040] TiO with jujube cake structure 2 Nanoparticle embedded ZIF67: Dissolve 0.5 g PVP in 10 mL absolute ethanol, and then wash the TiO 2 Nanoparticles were dispersed in the PVP ethanol solution, stirred at room temperature for 24 h, washed with absolute ethanol three times, and then dispersed in 2.5 mL of methanol solution. Take 0.5 mL of TiO 2 The methanol solution was dropped into the methanol solution of cobalt nitrate with a volume of 50 mL and a concentration of 10 mM. After stirring for 3 min, the methanol solution of 2-methylimidazole with a volume of 80 mL and a concentration of 40 mM was quickly added, and the stirring was continued for 1 min. After standing for 12 h, the product was separated by cen...

Embodiment 3

[0045] Synthetic TiO 2 Nanoparticles: Add 0.2 mL of ammonia water to 10 mL of absolute ethanol, stir for 5 min, then add 0.1 mL of isopropyl titanate (TIP) under vigorous stirring, centrifuge after stirring for 10 min, wash with absolute ethanol for 3 Second-rate.

[0046] TiO with jujube cake structure 2 Nanoparticle embedded ZIF67: Dissolve 0.5 g PVP in 10 mL absolute ethanol, and then wash the TiO 2 Nanoparticles were dispersed in the PVP ethanol solution, stirred at room temperature for 24 h, washed with absolute ethanol three times, and then dispersed in 2.5 mL of methanol solution. Take 1.7 mL of TiO 2 The methanol solution was dropped into the methanol solution of cobalt nitrate with a volume of 50 mL and a concentration of 30 mM. After stirring for 3 min, the methanol solution of 2-methylimidazole with a volume of 80 mL and a concentration of 120 mM was quickly added, and the stirring was continued for 1 min. After standing for 12 h, the product was separated by ce...

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Abstract

The invention discloses a lithium ion battery negative electrode material in which TiO2 nanoparticles are embedded in a CoS hollow shell, belonging to the technical field of lithium ion batteries. Thepreparation method of the invention is to synthesize TiO2 nanometer particles by the hydrolysis method of isopropyl titanate, Then a layer of MOF-affinity PVP was coated on the surface of TiO2 nanoparticles to make TiO2 nanoparticles absorbed in the growth process of ZIF67. The surface of TiO2 nanoparticles was mosaic and embedded in ZIF67 to form a kind of jujube cake structure. Finally, the final product was obtained by hydrothermal vulcanization with thioacetamide. The CoS hollow shell embedding TiO2 nanoparticles provided by the invention is used as the negative electrode material of thelithium ion battery, and the CoS hollow shell embedding TiO2 nanoparticles have good charge-discharge performance and cycle stability, and have important application value in the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode material and a 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 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 electrochemical performance of lithium-ion batteries and promote the further ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/48H01M4/5815H01M10/0525Y02E60/10
Inventor 严微微
Owner CHINA JILIANG UNIV
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