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Doped modified lithium ion battery vanadate negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, which is applied in the direction of battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of low conductivity and volume expansion of materials, achieve the expansion of intercalation channels, easy control, and increase the migration rate. Effect

Active Publication Date: 2020-04-21
NINGBO POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a mixed transition metal oxide, this material also has the same problems as other transition metal oxides. The material has low electrical conductivity, and the volume expands and shrinks severely as lithium is intercalated and extracted in the material during charge and discharge.

Method used

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  • Doped modified lithium ion battery vanadate negative electrode material and preparation method thereof
  • Doped modified lithium ion battery vanadate negative electrode material and preparation method thereof
  • Doped modified lithium ion battery vanadate negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Accurately weigh 0.85molFe(OH) 3 , 0.14molSb(OH) 3 , 1.0molNH 4 VO 3 , 0.03mol NH 4 F, put it into the ball mill tank of the planetary ball mill, add deionized water, and ball mill to obtain the rheological phase mixture. While stirring, add 1.0 mol / L oxalic acid solution dropwise to the rheological phase mixture, adjust the pH value of the mixture to 5.8, and stir thoroughly. The mixture was transferred to a stainless steel high-pressure tank, and reacted at a constant temperature of 220°C for 24 hours. After taking it out and drying it, the solid mixture was ground to obtain a precursor powder. Put the precursor powder into a program-controlled electric furnace and heat it up to 720°C at a heating rate of 5°C / min, and keep it for 8 hours to obtain doped modified Fe 0.85 Sb 0.14 VO 4 f 0.03 Vanadate anode material.

[0029] The synthesized Fe 0.85 Sb 0.14 VO 4 f 0.03 The vanadate negative electrode material, acetylene black, and polytetrafluoroethylene are...

Embodiment 2

[0031] Accurately weigh 0.25molFe 2 o 3 , 0.05molSb 2 o 3 , 1.0molNH 4 VO 3 , 0.01mol NH 4 F, put it into the ball mill tank of the planetary ball mill, add deionized water, and ball mill to obtain the rheological phase mixture. While stirring, add 0.5 mol / L oxalic acid solution dropwise to the rheological phase mixture, adjust the pH value of the mixture to 5.1, and stir thoroughly. The mixture was transferred to a stainless steel high-pressure tank, and reacted at a constant temperature of 150°C for 60 hours. After taking it out and drying it, the solid mixture was ground to obtain a precursor powder. Put the precursor powder into a program-controlled electric furnace and heat it up to 500°C at a heating rate of 3°C / min, and keep it warm for 1 hour to obtain doped modified Fe 0.5 Sb 0.1 VO 4 f 0.01 Vanadate anode material.

[0032] The synthesized Fe 0.5 Sb 0.1 VO 4 f 0.01 The vanadate negative electrode material, acetylene black, and polytetrafluoroethylene a...

Embodiment 3

[0034] Accurately weigh 0.6mol Fe(OH) 3 , 0.19molmolSb 2 o 3 , 1.0mol NH 4 VO 3 , 0.015mol HF, put into the ball mill tank of the planetary ball mill, add an appropriate amount of deionized water, and ball mill to obtain the rheological phase mixture. While stirring, add 1.0 mol / l oxalic acid solution dropwise to the rheological phase mixture, adjust the pH value of the mixture to 5.5, and stir thoroughly. The mixture was transferred to a stainless steel high-pressure tank, and reacted at a constant temperature of 160°C for 56 hours. After taking it out and drying it, the solid mixture was ground to obtain a precursor powder. Put the precursor powder into a program-controlled electric furnace and heat it up to 600°C at a heating rate of 4°C / min, and hold it for 3 hours to obtain doped modified Fe 0.6 Sb 0.38 VO 4 f 0.015 Vanadate anode material.

[0035] The synthesized Fe 0.6 Sb 0.38 VO 4 f 0.015 The vanadate negative electrode material, acetylene black, and poly...

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Abstract

The invention relates to a doped modified lithium ion battery vanadate negative electrode material and a preparation method thereof, and belongs to the field of lithium ion battery material preparation. The doped modified lithium ion battery vanadate negative electrode material is composed of an iron source compound, an antimony source compound, a vanadate source compound and a fluorine source compound according to a molar ratio of Fe:Sb:VO4<3->:F being x:y:1:z, wherein x ranges from 0.5 to 0.9, y ranges from 0.1 to 0.5, and z ranges from 0.01 to 0.1. Vanadate is used as a main body framework,iron ions and antimony ions with different ion radiuses and electronic structures and fluorine ions with a relatively small radius and relatively strong electronegativity are mutually doped, the distribution of an electric field in a unit cell is changed, a lithium ion intercalation and deintercalation channel in a crystal is expanded, the migration rate of lithium ions is improved, and the impact of lithium ions on a crystal structure due to the volume change of the crystal in the intercalation and deintercalation process is buffered, so that the lithium storage performance of the material is improved, and the cycle life of the lithium ion battery doped with the vanadate negative electrode material is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion battery materials, and in particular relates to a doped modified lithium ion battery vanadate negative electrode material and a preparation method thereof. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, human beings need more alternative and environmentally friendly new energy sources. As an environmentally friendly and renewable energy source, lithium-ion batteries have the advantages of high energy density, good safety performance, and environmental protection, and have received widespread attention in recent years. [0003] Anode materials are key components of lithium-ion batteries. At present, the lithium storage anode materials that have been practically used in lithium-ion batteries are basically carbon materials, such as artificial graphite, natural graphite, mesocarbon microspheres, petroleum coke, carbon fiber, pyrolytic r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525H01M2004/027Y02E60/10
Inventor 袁正勇
Owner NINGBO POLYTECHNIC
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