Oxygen-vacancy Li3VO4 negative electrode material for lithium-ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as low tap density and large irreversible capacity loss, achieve low cost, improve electrochemical performance, reduce phase The effect of variable energy

Active Publication Date: 2020-01-03
XIAMEN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium vanadate materials with nano-hollow structure will lead to problems such as low tap density and large irreversible capacity loss.

Method used

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  • Oxygen-vacancy Li3VO4 negative electrode material for lithium-ion battery and preparation method thereof
  • Oxygen-vacancy Li3VO4 negative electrode material for lithium-ion battery and preparation method thereof
  • Oxygen-vacancy Li3VO4 negative electrode material for lithium-ion battery and preparation method thereof

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preparation example Construction

[0028] A kind of oxygen vacancy Li provided by the embodiment of the present invention 3 VO 4 The preparation method of lithium ion battery negative electrode material, comprises the following steps:

[0029] S1, vanadium pentoxide (V 2 o 5 ) and lithium hydroxide hydrate (LiOH·H 2 O) stirring the reaction in ethanol solution, then drying to obtain the precursor.

[0030] In a preferred embodiment, in this step, the molar ratio of vanadium pentoxide to lithium hydroxide hydrate is 1˜1.2:6. More preferably, the molar ratio of vanadium pentoxide to lithium hydroxide hydrate is 1.1:6. A slight excess of vanadium pentoxide can speed up the reaction rate.

[0031] In a preferred embodiment, in this step, the ethanol solution is ethanol and water in a volume ratio of 3-4:1. The stirring reaction time is 5~7h. Choose V 2 o 5 and LiOH·H 2 O is used as a raw material, and the cost is relatively low. More importantly, LiOH·H 2 The reducing property of O contributes to the fo...

Embodiment 1

[0047] An oxygen vacancy Li provided in this embodiment 3 VO 4 Lithium-ion battery negative electrode material is prepared according to the following steps:

[0048] (1) Put V 2 o 5 and LiOH·H 2 O was stirred in an ethanol solution at a molar ratio of 1.1:6 for 6 h, and then dried in an oven at 50 °C to obtain a precursor powder.

[0049] (2) Ball milling the precursor powder for 3 hours under the condition of 50-150 r / min to obtain a ground product.

[0050] (3) The ground product was sintered at 600 °C for 2 h to obtain the oxygen vacancy Li 3 VO 4 Lithium-ion battery anode material.

[0051] The first coulombic efficiency of the prepared sample was 79%, 1Ag -1 Under the current density, the capacity is still maintained at 414mAh g after 200 cycles -1 .

Embodiment 2

[0053] An oxygen vacancy Li provided in this embodiment 3 VO 4 Lithium-ion battery negative electrode material is prepared according to the following steps:

[0054] (1) Put V 2 o 5 and LiOH·H 2 O was stirred in an ethanol solution at a molar ratio of 1.1:6 for 6 h, and then dried in an oven at 50 °C to obtain a precursor powder.

[0055] (2) Ball mill the precursor powder for 1.5 h under the condition of 100 r / min, then add polyethylene glycol with a mass fraction of 1.5%, and ball mill for 1.5 h under the condition of 250 r / min.

[0056] (3) The ground product was sintered at 600 °C for 2 h to obtain the oxygen vacancy Li 3 VO 4 Lithium-ion battery anode material.

[0057] Add conductive agent and binder PVdF and NMP as solvent, control the content of various solid substances in the slurry to be Li 3 VO 4 :Super P:PVdF=80:10:10, using copper sheets as current collectors to prepare electrodes and assemble them into button cells for measurement, the first Coulombic ef...

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Abstract

The invention provides an oxygen-vacancy Li3VO4 negative electrode material for a lithium-ion battery and a preparation method thereof and relates to the technical field of lithium-ion battery materials. The preparation method of the oxygen-vacancy Li3VO4 negative electrode material for the lithium-ion battery comprises the following steps: stirring vanadium pentoxide and lithium hydroxide hydratein an ethanol solution and reacting; then drying to obtain a precursor; grinding the precursor to obtain a ground product; and sintering the ground product in a nitrogen gas atmosphere for 1-2 h under the condition of 550-650 DEG C, so as to obtain the oxygen-vacancy Li3VO4 negative electrode material for the lithium-ion battery. The preparation method provided by the invention is simple and feasible and an oxygen vacancy can be formed on the surface layer of the material after the ground product is sintered in the nitrogen gas atmosphere; and the product is high in specific surface area andcan be used for reducing the phase change activation energy in a charging and discharging process and improving the chemical performance of Li3VO4.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, and in particular to an oxygen vacancy Li 3 VO 4 Lithium-ion battery negative electrode material and preparation method thereof. Background technique [0002] Li 3 VO 4 As a negative electrode material for intercalated lithium-ion batteries, it has attracted more and more attention. compared to graphite and Li 4 Ti 5 o 12 , Li 3 VO 4 Have a suitable voltage platform (0.5~1.0V vs Li / Li + ), which can not only avoid the problem of lithium dendrites on the surface, but also have a ratio of Li 4 Ti 5 o 12 The lower working potential is considered to be a promising anode material for lithium-ion batteries. [0003] However, Li 3 VO 4 It is an electronic insulator, and its low electrical conductivity seriously affects its electrochemical performance. These problems are usually improved by reducing the size to the nanoscale or improving the synthesis method such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00H01M4/485H01M10/0525
CPCC01G31/00H01M4/485H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 麻季冬张厚安古思勇廉冀琼杨益航陈莹张勇
Owner XIAMEN UNIV OF TECH
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