Carbon-coated sodium ferric phosphate sodium ion battery positive electrode material, and preparation method and application thereof

A technology of sodium ion battery and sodium iron phosphate, which is applied in the field of electrochemistry, can solve the problems of restricting industrial application and inability to meet large-scale energy storage, and achieve easy industrial control, excellent charge and discharge cycle stability, and meet application requirements Effect

Pending Publication Date: 2022-02-15
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This shows that, by reducing the maricite NaFePO 4 Particles down to nanoscale, can effectively excite NaFePO 4 Electrochemical activity; however, the time-consuming and energy-consuming ball milling process severely limits the possibility of its industrial application and cannot meet the needs of large-scale energy storage

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  • Carbon-coated sodium ferric phosphate sodium ion battery positive electrode material, and preparation method and application thereof
  • Carbon-coated sodium ferric phosphate sodium ion battery positive electrode material, and preparation method and application thereof
  • Carbon-coated sodium ferric phosphate sodium ion battery positive electrode material, and preparation method and application thereof

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preparation example Construction

[0056] The present invention also provides a method for preparing the positive electrode material of the above-mentioned carbon-coated sodium iron phosphate sodium ion battery, comprising the following steps:

[0057] A) Dissolving the carbon source compound in a mixed solution of methanol and N,N-dimethylformamide, then dissolving the phosphorus-containing sodium source compound, iron source compound and chelating agent in the mixed solution, stirring evenly, Obtain precursor solution;

[0058] B) After putting the precursor solution into an oven for drying, a gel precursor is obtained;

[0059] C) The gel precursor is sequentially calcined for the first time and calcined for the second time to obtain a carbon-coated iron-sodium-sodium-ion battery cathode material.

[0060] Preferably in the present invention, in the mixed solution of methanol and N,N-dimethylformamide, the volume ratio of methanol and N,N-dimethylformamide is 2:1, preferably 20mL methanol+10mL N, N-Dimethy...

Embodiment 1

[0095] In this embodiment, the carbon source compound is polyvinylpyrrolidone, the iron source compound is ferric nitrate, the phosphorus-containing sodium source compound is sodium dihydrogen phosphate, and the chelating agent is citric acid.

[0096] Step 1, carbon-coated sodium iron phosphate (NaFePO 4 / C) materials, the raw materials include ferric nitrate, sodium dihydrogen phosphate, polyvinylpyrrolidone and citric acid, and the solvents are methanol and N,N-dimethylformamide.

[0097] At room temperature, dissolve 1.8g of polyvinylpyrrolidone in a mixed solution of 20mL of methanol and 10mL of N,N-dimethylformamide, then add 6mmol of sodium dihydrogen phosphate, 6mmol of citric acid and 6mmol of ferric nitrate in sequence, and stir The gel precursor solution was uniformly obtained; the gel precursor solution was dried in an oven at 75 °C for 24 h, and then the dried colloid was placed in a tube furnace and heated at a rate of 5 °C / min under a nitrogen atmosphere for 300...

Embodiment 2

[0110] The preparation method is the same as in Example 1, except that the addition of the carbon source compound polyvinylpyrrolidone is changed to 0.9g to obtain the target product NaFePO 4 / C.

[0111] Figure 8 Shown is the XRD figure and maricite type NaFePO of embodiment 2 gained target product 4 The standard card PDF#29-1216, it can be seen from the figure that the main component of the material is NaFePO 4 , and good crystallinity.

[0112] Figure 9 Shown is the SEM picture of the target product obtained in Example 2, from which it can be seen that the target product is mainly composed of nanoparticles.

[0113] Figure 10 Shown is the obtained target product of embodiment 2 at 20mA g -1 The first charge and discharge curve under the current density, it can be seen from the figure that the material is applied to the sodium ion battery for the first discharge specific capacity to reach 106.6mAh g -1 .

[0114] Figure 11 Shown is the obtained target product of...

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Abstract

The invention provides a carbon-coated sodium ferric phosphate sodium ion battery positive electrode material and a preparation method and application thereof. The preparation method comprises the steps: dissolving a carbon source compound, a phosphorus-containing sodium source compound, an iron source compound and a chelating agent in a mixed solution of methyl alcohol and N, N-dimethylformamide, performing stirring and drying to obtain a gel precursor is obtained, and calcining the gel precursor twice in a nitrogen atmosphere to obtain the carbon-coated sodium ferric phosphate sodium ion battery positive electrode material. The particle size of the sodium ion battery positive electrode material provided by the invention is 15-45nm, and the sodium ion battery positive electrode material has excellent sodium storage capacity and excellent charge-discharge cycle stability (after 100 cycles, the capacity retention ratio is 94.2%), and is an ideal positive electrode material of a sodium ion battery. The preparation method is simple in synthesis process, low in cost and convenient for industrial control, and can meet the application requirements of large-scale energy storage devices.

Description

technical field [0001] The invention belongs to the field of electrochemistry and relates to the preparation and application of a positive electrode material for a sodium ion battery, in particular to the preparation and application of a carbon-coated sodium iron phosphate material. Background technique [0002] Energy is an indispensable basic condition for social development and the material basis for human survival. With the depletion of traditional fossil energy such as oil and coal, it is urgent to develop and utilize new energy, and research and develop high-safety and low-cost energy storage technologies. Lithium-ion batteries have been widely used in portable electronic devices and power vehicles due to their advantages such as high energy density, long cycle life, and small self-discharge. At the same time, the ever-decreasing lithium resources and rising lithium prices make people use More attention has turned to sodium-ion batteries. [0003] Na-ion batteries and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/366H01M4/5825H01M4/583H01M10/054Y02E60/10
Inventor 章根强赵莉萍
Owner UNIV OF SCI & TECH OF CHINA
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