Preparation method, product and application of LiCuVO4 nanofibers

A nanofiber and organic solvent technology, applied in the field of preparation of LiCuVO4 nanofibers, can solve the problems of large particle size, small specific surface area, and uneven structure of electrode materials, and achieve the advantages of small size, high specific surface area, and improved structural stability. Effect

Active Publication Date: 2019-08-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the above, it can be seen that LiCuVO prepared by solid-state reaction 4 The particle size of the electrode material is large and uneven, the specific surface area is small, and the structure is uneven, resulting in serious volume changes during charge and discharge, resulting in poor performance

Method used

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  • Preparation method, product and application of LiCuVO4 nanofibers
  • Preparation method, product and application of LiCuVO4 nanofibers
  • Preparation method, product and application of LiCuVO4 nanofibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Get vanadyl acetylacetonate (0.2mol), lithium acetate dihydrate (0.2mol) and copper acetate monohydrate (0.2mol), add in 5mL N-N dimethylformamide solution, then add 0.4g polyacrylonitrile, at 40 Under the condition of ℃, stir until dark blue homogeneous solution, which is the spinning solution.

[0024] The resulting spinning solution was injected into a 10mL disposable syringe, an applied voltage of 8kV was set, and the pushing speed was set at 0.5mm / min to carry out electrospinning. After the spinning was completed, a light blue nanofiber precursor was obtained.

[0025] The obtained precursor was heat-treated in air at 250 °C for 40 min, and the heating rate was 3 °C / min. Then, the cured material was continuously calcined in the air at 450°C for 0.5h and the heating rate was 5°C / min to obtain carbon-containing LiCuVO 4 Nanofiber, its carbon content was measured to be 4.07%.

[0026] The resulting carbon-containing LiCuVO 4 The nanofibers were analyzed by XRD, and...

Embodiment 2

[0036] Take vanadyl acetylacetonate (0.2mol), lithium acetate dihydrate (0.2mol) and copper acetate monohydrate (0.2mol) and add them to 5mL N-N dimethylformamide solution, then add 0.3g polyacrylonitrile, at 40℃ Under the condition of stirring until dark blue homogeneous solution, which is the spinning solution.

[0037] Inject the spinning liquid into a 10mL disposable syringe, apply a voltage of 8kV, set the push speed at 0.5mm / min, and carry out electrospinning. After spinning, a light blue nanofiber precursor is obtained.

[0038] The obtained precursor was heat-treated in air at 250 °C for 40 min, and the heating rate was 3 °C / min. Then, the solidified material was continuously calcined in the air at 450°C for 0.5h, and the heating rate was 5°C / min to obtain carbon-containing LiCuVO 4 Nanofiber, its carbon content was measured to be 3.83%.

[0039] According to the performance test method in embodiment 1, the carbon-containing LiCuVO prepared in the present embodiment ...

Embodiment 3

[0041] Get vanadyl acetylacetonate (0.2mol), lithium acetate dihydrate (0.2mol) and copper acetate monohydrate (0.2mol), add in 5mL N-N dimethylformamide solution, then add 0.5g polyacrylonitrile, at 45 Under the condition of ℃, stir until dark blue homogeneous solution, which is the spinning solution.

[0042] The resulting spinning solution was injected into a 10mL disposable syringe, an applied voltage of 10kV was set, and the pushing speed was set at 0.7mm / min to carry out electrospinning. After the spinning was completed, a light blue nanofiber precursor was obtained.

[0043] The obtained precursor was heat-treated in air at 300 °C for 30 min, and the heating rate was 5 °C / min. Then, the cured material is continuously calcined in the air at 480°C for 0.5h and the heating rate is 3°C / min to obtain carbon-containing LiCuVO 4 Nanofiber, its carbon content was measured to be 4.58%.

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Abstract

The invention discloses a preparation method, product and application of LiCuVO4 nanofibers. The method comprises the steps of: adding vanadium acetylacetonate, lithium acetate dihydrate and copper acetate monohydrate to an organic solvent, adding polyacrylonitrile, and then heating and stirring the solution until the solution is clear and uniform dark blue to obtain a spinning solution; putting the spinning solution in a container loading device of an electrospinning machine, setting electrospinning process parameters, and then performing electrospinning to obtain precursor nanofibers; dryingthe precursor nanofibers and then calcining the precursor nanofibers in air to obtain the LiCuVO4 nanofibers. The method enables a vanadium source, a lithium source and a copper source which are soluble in an organic solvent to react in the organic solvent, and prepares the nanofibers in combination with an electrospinning process and a calcination process. The prepared LiCuVO4 is small in size,uniform in structure, and small in volume change during charging and discharging so as to be improved in electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium ion battery electrode materials, in particular to a LiCuVO 4 Preparation methods of nanofibers and their products and applications. Background technique [0002] Vanadate materials, as anode materials for lithium-ion batteries, have the advantages of multivalency, layered structure, safe working voltage and high capacity. Among them, LiCuVO 4 When four lithium ions are intercalated, its theoretical capacity can reach 576mAhg -1 , is a very potential lithium-ion battery anode material. During the charging and discharging process, LiCuVO 4 will decompose into Li 3 VO 4 And irreversible copper nanoparticles are uniformly dispersed in it, which improves the electronic conductivity. Currently, LiCuVO 4 The preparation method of LiCuVO4 is mainly a solid-state reaction method. For example, in the literature "LiCuVO4 Negative Material Synthesis and Electrochemical Performance Resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525D01F9/10D01D5/00B82Y40/00
CPCH01M4/364H01M4/485H01M4/625H01M10/0525D01F9/10D01D5/003B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 潘安强崔荣郝鹏飞林建德
Owner CENT SOUTH UNIV
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