All-weather energy storage lamellar polyanionic compound positive electrode material and preparation method thereof

A polyanion and positive electrode material technology, applied in the direction of electrical components, battery electrodes, structural parts, etc., to achieve the effects of enhanced long-term cycle stability, large specific surface area, and short diffusion distance

Inactive Publication Date: 2021-12-17
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the problem of heat dissipation is another challenge for cathode materials for high-temperature and high-power sodium-ion batteries (SIBs)

Method used

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  • All-weather energy storage lamellar polyanionic compound positive electrode material and preparation method thereof
  • All-weather energy storage lamellar polyanionic compound positive electrode material and preparation method thereof
  • All-weather energy storage lamellar polyanionic compound positive electrode material and preparation method thereof

Examples

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preparation example Construction

[0023] The preparation method of the all-weather energy storage sheet layered polyanion compound positive electrode material among the present invention comprises the following steps:

[0024] Step 1, adding diammonium hydrogen phosphate and oleic acid into a ball mill jar, and ball milling at a speed of 750 r / min for 20 minutes to obtain a first mixture. Among them, the excess of diammonium hydrogen phosphate is 2%-4% on the basis of theoretical materials used, which can be calculated according to the ratio of stoichiometric numbers.

[0025] Step 2, adding liquid paraffin or Span 80 to the first mixture and ball milling for 20 minutes to obtain the second mixture. Among them, the quality of liquid paraffin is twice that of oleic acid.

[0026] Step 3, adding ferric oxalate dihydrate into N-methylpyrrolidone for ultrasonic dispersion for 30 minutes to obtain a third mixture.

[0027] Step 4, adding the third mixture to the second mixture and ball milling for 20 minutes to o...

Embodiment 1

[0033] This embodiment prepares the all-weather energy storage sheet layered polyanion compound positive electrode material, and its specific preparation method includes the following steps:

[0034] Step 1: Add 2.3006g of diammonium hydrogen phosphate and 5.6429g of oleic acid into a ball mill jar, and ball mill for 20min at a speed of 750r / min to obtain the first mixture.

[0035] In step 2, 11.2984 g of liquid paraffin was added to the first mixture and ball milled for 20 minutes to obtain a second mixture.

[0036] Step 3, adding 2.6984 g of ferric oxalate dihydrate into 20 ml of N-methylpyrrolidone for ultrasonic dispersion for 30 min to obtain a third mixture.

[0037] Step 4, adding the third mixture to the second mixture and ball milling for 20 minutes to obtain the fourth mixture.

[0038] Step 5, adding 1.0599 g of anhydrous sodium carbonate to the fourth mixture and continuing ball milling for 12 hours to obtain a precursor.

[0039] Step 6: Put the precursor in a...

Embodiment 2

[0054] The preparation method of this example is basically the same as that of Example 1, except that the liquid paraffin in step 2 of Example 1 is replaced by Span 80 in the preparation method of this example.

[0055] The modified sodium ion battery Na obtained in this embodiment 4 Fe 3 (PO 4 ) 2 (P 2 o 7 ) After the positive electrode material was directly packed into a button cell and carried out electrochemical tests, the same effect and effect as in Example 1 were achieved, and it had a higher reversible capacity under all weather conditions.

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Abstract

The invention provides an all-weather energy storage lamellar polyanionic compound positive electrode material and a preparation method thereof, and belongs to the field of energy storage materials. The positive electrode material comprises a polyanion compound and an amorphous carbon layer loaded on the surface of the compound. The modified lamellar polyanion compound effectively solves the problems encountered by the polyanion positive electrode material in all weather, and has relatively high electrochemical performance at low temperature, normal temperature and high temperature; and the preparation method is simple and suitable for large-scale application.

Description

technical field [0001] The invention belongs to the field of energy storage materials, and relates to an all-weather energy storage sheet-like polyanion compound positive electrode material and a preparation method thereof. Background technique [0002] With the rapid development of clean energy such as wind energy, solar energy, and tidal energy, efficient energy storage facilities have also been rapidly developed. Among many energy storage devices, sodium-ion batteries are considered to be applied in the field of energy storage because of their unique advantages. However, for large-scale energy storage devices, not only low cost, good cycle performance, safety performance, but also strong environmental adaptability are required. Some current research works on lithium-ion batteries (LIBs) and supercapacitors have shown that strong electrolyte convection at temperatures >50 °C causes structural degradation of the electrode / electrolyte interface, low charge / discharge effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60
CPCH01M4/366H01M4/602Y02E60/10
Inventor 刘海梅李小强秦凯张渝张伯伦
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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