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Oxygen-deficient titanium dioxide nanosheet modified lithium ion battery diaphragm and preparation method and application thereof

A lithium-ion battery and titanium dioxide technology, which is applied in the field of preparation of oxygen-deficient titanium dioxide nanosheet modified layers, can solve problems such as hindering lithium ion migration, reducing battery reaction kinetics, etc., achieving excellent cycle stability and high capacity, and improving conductivity. and catalytic ability, improving the effect of inhibition

Inactive Publication Date: 2020-08-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of separator modification, the additional introduction of a certain thickness of the modification layer is bound to hinder the migration of lithium ions to a certain extent, reducing the reaction kinetics of the battery.
It is therefore a challenge to develop relatively thin functionalized membranes with strong dissolution inhibition of polysulfides.

Method used

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  • Oxygen-deficient titanium dioxide nanosheet modified lithium ion battery diaphragm and preparation method and application thereof
  • Oxygen-deficient titanium dioxide nanosheet modified lithium ion battery diaphragm and preparation method and application thereof
  • Oxygen-deficient titanium dioxide nanosheet modified lithium ion battery diaphragm and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Oxygen-deficient titania nanosheets with a thickness of 500 nm modified polypropylene separator (OVs-TiO 2 @PP diaphragm) preparation, it includes the following steps:

[0037] 1) 30mg TiO 2 After the nanosheets are fully ground, in the tube furnace, under the flowing hydrogen atmosphere, the temperature is raised to 200 °C at 2 °C min, and kept at the target temperature for 2 hours, and then the tube furnace is naturally cooled;

[0038] 2) On the basis of step 1), obtain OVs-TiO 2 ;

[0039] 3) On the basis of step 2), 10mg OVs-TiO 2 Nanosheets were added to 50mL of absolute ethanol, ultrasonicated for 2 hours and then allowed to stand for 6 hours;

[0040] 4) On the basis of step 3), take 30mL of the supernatant, and take 5mL of the supernatant to dry and determine the OVs-TiO 2 Concentration of nanosheets (0.1-0.2mg mL-1);

[0041] 5) On the basis of step 4), take 15mL of the supernatant in the remaining solution by vacuum filtration, and load OVs-TiO on the P...

Embodiment 2

[0050] Oxygen-deficient titania nanosheets with a thickness of 200 nm modified lithium battery polypropylene separator (OVs-TiO 2 @PP diaphragm) preparation, it includes the following steps:

[0051] 1) 30mg TiO 2 After the nanosheets are fully ground, in the tube furnace, under the flowing hydrogen atmosphere, the temperature is raised to 200 °C at 2 °C min, and kept at the target temperature for 2 hours, and then the tube furnace is naturally cooled;

[0052] 2) On the basis of step 1), obtain OVs-TiO 2 ;

[0053] 3) On the basis of step 2), 10mg OVs-TiO 2 Nanosheets were added to 50mL of absolute ethanol, ultrasonicated for 2 hours and then allowed to stand for 6 hours;

[0054] 4) On the basis of step 3), take 30mL of the supernatant, and take 5mL of the supernatant to dry and determine the OVs-TiO 2 Concentration of nanosheets (0.1-0.2mg mL-1);

[0055] 5) On the basis of step 4), take 8 mL of the supernatant from the remaining solution through vacuum filtration, an...

Embodiment 3

[0060] Oxygen-deficient titania nanosheets with a thickness of 800 nm modified lithium battery polypropylene separator (OVs-TiO 2 @PP diaphragm) preparation, it includes the following steps:

[0061] 1) 30mg TiO 2 After the nanosheets are fully ground, in the tube furnace, under the flowing hydrogen atmosphere, the temperature is raised to 200 °C at 2 °C min, and kept at the target temperature for 2 hours, and then the tube furnace is naturally cooled;

[0062] 2) On the basis of step 1), obtain OVs-TiO 2 ;

[0063] 3) On the basis of step 2), 10mg OVs-TiO 2 Nanosheets were added to 50mL of absolute ethanol, ultrasonicated for 2 hours and then allowed to stand for 6 hours;

[0064] 4) On the basis of step 3), take 30mL of the supernatant, and take 5mL of the supernatant to dry and determine the OVs-TiO 2 Concentration of nanosheets (0.1-0.2mg mL-1);

[0065] 5) On the basis of step 4), the remaining 25mL supernatant was vacuum filtered, and OVs-TiO was loaded on the PP m...

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Abstract

The invention relates to an oxygen-deficient titanium dioxide nanosheet modified lithium ion battery diaphragm and a preparation method and application thereof. The method comprises the following steps of 1) calcining titanium dioxide nanosheets at high temperature under flowing hydrogen to obtain oxygen-deficient titanium dioxide nanosheets, 2) dispersing the oxygen-deficient titanium dioxide nanosheet obtained in the step 1) into a solvent, and standing after ultrasonic treatment, 3) loading oxygen-deficient titanium dioxide on the lithium ion battery diaphragm through vacuum filtration of the suspension obtained in the step 2), and drying to obtain the functionalized diaphragm modified by the oxygen-deficient titanium dioxide nanosheet. The method has the beneficial effects that the adsorption capacity of the transition metal oxide to polysulfide is inherited, and charged polysulfide is very easy to capture, so that the capacity of inhibiting the dissolution of polysulfide is greatly improved. Besides, the introduction of oxygen deficiency can improve the conductivity and catalytic ability of TiO2, the conversion of long-chain polysulfide adsorbed on the surface of TiO2 into short-chain polysulfide is promoted, and the utilization rate of active substances is improved.

Description

technical field [0001] The invention relates to the construction of titanium dioxide oxygen defects and the preparation of oxygen-deficient titanium dioxide nano sheet modification layers with different thicknesses. Background technique [0002] With the process of economic globalization and the increasing demand for energy, finding new energy storage devices has become a hot spot in the field of new energy. Lithium-ion battery (LIB) is currently the battery system with the best comprehensive performance. It has the characteristics of high specific energy, high cycle life, small size, light weight, no memory effect, and no pollution. It has rapidly developed into a new generation of energy storage power supply. Power support for information technology, electric and hybrid vehicles, aerospace and other fields. However, currently limited by the theoretical capacity of positive and negative electrode materials, the energy density of lithium-ion batteries can no longer meet the...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M10/0525H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 麦立强李兆槐何秋许絮
Owner WUHAN UNIV OF TECH
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