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High-capacity VNb9O25 nanosheet lithium ion battery negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, nanotechnology and other directions, can solve the problems of limited practical use, poor electrical conductivity and capacity retention, and achieve low cost, good cycle performance, shape and size. controllable effect

Active Publication Date: 2020-10-16
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, however, its inherently poor conductivity and capacity retention during charge / discharge limits its practical use in Li-ion batteries

Method used

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  • High-capacity VNb9O25 nanosheet lithium ion battery negative electrode material and preparation method thereof
  • High-capacity VNb9O25 nanosheet lithium ion battery negative electrode material and preparation method thereof
  • High-capacity VNb9O25 nanosheet lithium ion battery negative electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The high-capacity VNb of this embodiment 9 o 25 The preparation method of nanosheet lithium ion battery negative electrode material is as follows:

[0038] (1) Dissolve 2.7 mmoles of niobium pentachloride (0.73 g) in 36 ml of absolute ethanol and stir for 0.5-1 hour to dissolve completely;

[0039] (2) Add 0.3 mmol of vanadyl acetylacetonate powder to the solution as a vanadium source, at this time, V:Nb is 1:9, and then ultrasonically shake for 0.5-1 hour to completely dissolve it;

[0040] (3) Add 20 mL of 25% tetramethylammonium hydroxide aqueous solution dropwise at a rate of 0.6 mL / min to the mixed solution for reaction, and stir until a clear solution is formed. At this time (vanadyl acetylacetonate+penta The molar ratio of niobium chloride) to tetramethylammonium hydroxide is 1:25.6;

[0041] (4) Afterwards, the obtained solution was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, and placed in a constant temperature drying...

Embodiment 2

[0047] (1) Dissolve 2.7 mmoles of niobium pentachloride (0.73 g) in 36 ml of absolute ethanol and stir for 0.5-1 hour to dissolve completely;

[0048] (2) Add 0.3 mmol of vanadyl acetylacetonate powder to the solution as a vanadium source, at this time, V:Nb is 1:9, and then ultrasonically shake for 0.5-1 hour to completely dissolve it;

[0049] (3) Add 30 mL of tetramethylammonium hydroxide aqueous solution dropwise to the mixed solution at a rate of 0.6 mL / min, and stir to dissolve it completely. At this time (vanadyl acetylacetonate + niobium pentachloride) and The mol ratio of methyl ammonium hydroxide is 1:38.3;

[0050] (4) Afterwards, the obtained solution was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, and placed in a constant temperature drying oven for heating reaction. The temperature of the heating reaction was 240°C, and the reaction time was 12 hours;

[0051] (5) The obtained reaction precipitate was washed several times...

Embodiment 3

[0056] The high-capacity VNb of this embodiment 9 o 25 The preparation method of nanosheet lithium ion battery negative electrode material is as follows:

[0057] (1) Dissolve 3 mmoles of niobium pentachloride (0.81g) in 36 ml of absolute ethanol and stir for 0.5-1 hour to dissolve completely;

[0058] (2) Add 0.6 mmol of vanadyl acetylacetonate powder to the solution as a vanadium source, at this time, V:Nb is 1:5, and then ultrasonically shake for 0.5-1 hour to completely dissolve it;

[0059] (3) Add 35 mL of tetramethylammonium hydroxide aqueous solution with a mass fraction of 25% dropwise into the mixed solution at a rate of 0.6 mL / min, and stir to dissolve it completely. At this time (vanadyl acetylacetonate + The molar ratio of niobium chloride) to tetramethylammonium hydroxide is 1:37.3;

[0060] (4) Afterwards, the obtained solution was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, and placed in a constant temperature drying ...

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Abstract

The invention discloses a high-capacity VNb9O25 nanosheet lithium ion battery negative electrode material and a preparation method thereof. The preparation method comprises the following steps dissolving niobium pentachloride in ethanol, adding a certain amount of vanadyl acetylacetonate powder into the solution, completely dissolving the mixed solution through ultrasonic oscillation, dropwise adding a tetramethylammonium hydroxide aqueous solution into the mixed solution, and stirring at a constant speed to completely dissolve the tetramethylammonium hydroxide aqueous solution; putting the obtained solution into a high-pressure reaction kettle, and carrying out a heating reaction; and cooling, washing, drying, and roasting to obtain the VNb9O25 nanosheet lithium ion battery negative electrode material. According to the invention, the VNb9O25 nanosheet lithium ion battery negative electrode material prepared by the preparation method disclosed by the invention is nanoscale and good indispersity, and has the advantages of high specific capacity, good cycle performance and the like when being used as the lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, in particular, relates to a high-capacity VNb 9 o 25 Nano sheet lithium ion battery negative electrode material and preparation method thereof. Background technique [0002] With the enhancement of people's awareness of environmental protection, electric vehicles are more and more widely concerned by people. Lithium-ion batteries are considered to be ideal power sources for electric vehicles due to their high energy density, high operating voltage, small size, long service life, and environmental friendliness. However, the current commercial lithium-ion batteries cannot meet the requirements of electric vehicles on charging speed, cruising range and safety. Therefore, the development of high-performance power lithium-ion batteries has always been the tireless pursuit of people. Electrode materials are the core and key of lithium-ion batteries, and have a decisive impact on the per...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/483H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 陈俊利杨新丽张永辉张智强王培远绪连彩巩飞龙苏聪超
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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