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Composite lithium ion battery negative material Li3VO4/Ag and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the field of electrochemical power supply, can solve the problems of poor conductivity, unsatisfactory electrochemical performance, and low Coulombic efficiency, and achieve the effects of easy operation, good cycle performance, and good repeatability

Active Publication Date: 2018-01-23
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Li 3 VO 4 Poor conductivity, resulting in Li 3 VO 4 The electrode produces a large polarization during the charge and discharge process, the first Coulombic efficiency is low, and the electrochemical performance is not ideal

Method used

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  • Composite lithium ion battery negative material Li3VO4/Ag and preparation method thereof
  • Composite lithium ion battery negative material Li3VO4/Ag and preparation method thereof
  • Composite lithium ion battery negative material Li3VO4/Ag and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The material synthesis steps are as follows:

[0019] 1) Weigh 1 mmol and 3 mmol of lithium carbonate and vanadium pentoxide according to the molar ratio of 1:3, respectively, and dissolve them in beakers A and B filled with 10 ml of deionized water, and stir on a magnetic stirrer for 20 minutes to fully dissolve;

[0020] 2) Weigh 5mmol hexamethylenetetramine and dissolve it in beaker C filled with 10ml deionized water, transfer the solutions in beakers B and C in step 1) to beaker A, stir on a magnetic stirrer for 40min to obtain the color homogeneous solution;

[0021] 3) Transfer the uniformly colored solution obtained in step 2) to the lining of a 50ml hydrothermal kettle and add deionized water to 80% of its volume, react in a blast oven at 120°C for 24h, and cool naturally to room temperature;

[0022] 4) Slowly add a theoretical silver content of Li to the product obtained in step 3) 3 VO 4 Quality 5% silver nitrate solution;

[0023] 5) Put the intermediate...

Embodiment 2

[0026] The material synthesis steps are as follows:

[0027] 1) Weigh 1 mmol and 3 mmol of lithium carbonate and vanadium pentoxide according to the molar ratio of 1:3, respectively, and dissolve them in beakers A and B filled with 10 ml of deionized water, and stir on a magnetic stirrer for 20 minutes to fully dissolve;

[0028] 2) Weigh 5mmol hexamethylenetetramine and dissolve it in beaker C filled with 10ml deionized water, transfer the solutions in beakers B and C in step 1) to beaker A, stir on a magnetic stirrer for 40min to obtain the color homogeneous solution;

[0029] 3) Transfer the uniformly colored solution obtained in step 2) to the lining of a 50ml hydrothermal kettle and add deionized water to 80% of its volume, react in a blast oven at 120°C for 24h, and cool naturally to room temperature;

[0030] 4) Slowly add a theoretical silver content of Li to the product obtained in step 3) 3 VO 4 Quality 5% silver nitrate solution;

[0031]5) Put the intermediate ...

Embodiment 3

[0034] The material synthesis steps are as follows:

[0035] 1) Weigh 1 mmol and 3 mmol of lithium carbonate and vanadium pentoxide according to the molar ratio of 1:3, respectively, and dissolve them in beakers A and B filled with 10 ml of distilled water, and stir on a magnetic stirrer for 20 minutes to fully dissolve;

[0036] 2) Weigh 5mmol of hexamethylenetetramine and dissolve it in beaker C containing 10ml of distilled water, transfer the solutions in beakers B and C in step 1) to beaker A, stir on a magnetic stirrer for 40min to obtain a uniform color solution;

[0037] 3) Transfer the homogeneously colored solution obtained in step 2) to the lining of a 50ml hydrothermal kettle to 80% volume, react in a blast oven at 120°C for 24 hours, and cool naturally to room temperature;

[0038] 4) in the product that obtains in step 3), add the silver nitrate that theoretical silver content is 5%;

[0039] 5) Put the intermediate product obtained in step 4) in an oil bath at ...

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Abstract

The invention provides a preparation method of a composite lithium ion battery negative material Li3VO4 / Ag. The method is specifically as follows: respectively dissolving lithium carbonate, vanadium pentoxide and hexamethylenetetramine in a container filled with deionized water, stirring for 30 min to sufficiently dissolving the same; transferring the obtained mixed solution to a hydrothermal kettle lining, adding deionized water to 80% of the volume of the hydrothermal kettle lining; reacting for 5-30h in an air-circulating oven at 120-180 DEG C, naturally cooling to room temperature to obtain the reaction liquid; slowly adding a silver nitrate solution while fast stirring the obtained reaction liquid so as to obtain an intermediate product, performing oil bath on the intermediate productat 60-85 DEG C for 10-20h, and then drying in an oven at 60-85 DEG C, grinding until the powder is brown, calcining the powder for 5-10h at 450-650 DEG C in nitrogen or argon protective atmosphere toobtain the Li3VO4 / Ag composite material. The material is applied to the lithium ion battery negative material so as to display good electrochemical performance.

Description

technical field [0001] The invention relates to a novel lithium-ion battery negative electrode material, in particular to Li 3 VO 4 The invention discloses an Ag / Ag composite negative electrode material, which belongs to the field of electrochemical power sources. technical background [0002] In recent years, with the rapid development of lithium-ion battery systems, its application fields have been continuously expanded, gradually expanding from the field of portable electronic equipment to electric vehicles and large-scale energy storage projects, which undoubtedly put forward higher requirements for lithium-ion batteries. . Lithium-ion battery anode materials play an important role in the battery. At present, the commercial lithium-ion battery negative electrode is graphite-like carbon material, Li 4 Ti 5 o 12 , but it is difficult for the two to meet the current market demand in terms of energy density, safety performance, and cycle life. The development of new h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCY02E60/10
Inventor 倪世兵康桃唐俊杨学林
Owner CHINA THREE GORGES UNIV
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