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Nitrogen-doped carbon-coated porous hollow bowl-shaped iron oxide powder material and preparation method thereof

A nitrogen-doped carbon and iron oxide powder technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of low material space utilization, poor volumetric energy density of electrode sheets, and low tap density.

Active Publication Date: 2019-09-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been reports in the literature that hollow iron oxide ball particles have been used in lithium-ion batteries, but such materials often have defects such as low material space utilization, low tap density, and poor volumetric energy density of electrode sheets.

Method used

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  • Nitrogen-doped carbon-coated porous hollow bowl-shaped iron oxide powder material and preparation method thereof
  • Nitrogen-doped carbon-coated porous hollow bowl-shaped iron oxide powder material and preparation method thereof
  • Nitrogen-doped carbon-coated porous hollow bowl-shaped iron oxide powder material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 15 milliliters of deionized aqueous solution containing the mixed juice of 3 grams of apples and grapes, 6 milliliters of sodium oleate solution (10mmol / L) and 6 milliliters of P123 solution (1mmol / L) were mixed, and stirred until uniformly mixed, the Put the mixed transparent liquid into a 50ml polytetrafluoroethylene-lined stainless steel water heating tank. After tightening the lid, put the water heating tank in an oven at 150°C. After 20 hours of heat preservation, take the water heating tank out of the oven and place it in the air Cool to room temperature, then open the water-heated jar, pour out the mixture inside, centrifuge in a centrifuge at 8000 rpm to obtain a precipitate, then repeatedly wash with water and ethanol to obtain a hollow carbon bowl. Put 1 gram of hollow bowl-shaped carbon into 10 milliliters of ferric nitrate solution (1mol / L), disperse evenly by ultrasonic oscillation, and stir at room temperature for 12 hours, centrifuge in a centrifuge at 800...

Embodiment 2

[0028]Mix 20 milliliters of deionized aqueous solution containing 1 gram of glucose and sucrose, 8 milliliters of polyacrylamide solution (10 mmol / L) and 8 milliliters of P123 solution (1 mmol / L), and stir until uniformly mixed, and the mixed transparent liquid Put it into a 50 ml polytetrafluoroethylene-lined stainless steel water heating tank, tighten the lid, put the water heating tank in an oven at 160°C, keep it warm for 20 hours, take the water heating tank out of the oven, and cool it in the air until room temperature, then open the water-heated jar, pour out the mixture inside, and centrifuge in a centrifuge at 8000 rpm to obtain a precipitate, which is then repeatedly washed with water and ethanol to obtain a hollow carbon bowl. Put 3 grams of hollow bowl-shaped carbon into 10 milliliters of ferric nitrate solution (4mol / L), disperse evenly by ultrasonic oscillation, and stir at room temperature for 6 hours, centrifuge in a centrifuge at 8000 rpm to obtain a precipitat...

Embodiment 3

[0030] Contain 40 milliliters of deionized aqueous solution of the juice of 3 grams of three kinds of fruits pear, apple, sugarcane, 10 milliliters of N-oleoyl N-methyl taurine sodium solution (10mmol / L) and 10 milliliters of polyoxyethylene ether solution (1mmol / L) mixed, and stirred until evenly mixed, the mixed transparent liquid was put into 100 milliliters of polytetrafluoroethylene-lined stainless steel hydrothermal pots, and after the lid was tightened, the hydrothermal pots were put into a 180°C oven. After insulated for 8 hours, take the hydrothermal pot out of the oven, place it in the air to cool to room temperature, then open the hydrothermal pot, pour out the mixture inside, centrifuge in a centrifuge at 8000 rpm to obtain a precipitate, and then water and Ethanol was washed repeatedly to obtain a hollow carbon bowl. Put 1 gram of hollow bowl-shaped carbon into 20 milliliters of ferric oxalate solution (1mol / L), disperse evenly by ultrasonic oscillation, and stir ...

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Abstract

The invention belongs to the technical field of inorganic material preparation and battery materials, and particularly relates to a nitrogen-doped carbon-coated porous hollow bowl-shaped iron oxide powder material and a preparation method thereof. The nitrogen-doped carbon-coated porous hollow bowl-shaped iron oxide powder material is used for an ion battery negative electrode with high volume energy density and stability. A powder particle is formed by compounding iron oxide and carbon, has a complete hollow bowl-shaped morphology and consists of inner and outer double-layer walls; a gap exists between the spherical walls; a nitrogen-doped amorphous carbon film uniformly coats the surface of the iron oxide; and the thickness of a coating layer is controllable. The material has the advantages of a hollow structure material, thereby solving the problem that the capacity is irreversibly reduced due to breaking and falling of the electrode caused by volume change of the iron oxide in charge and discharge processes of a secondary battery; meanwhile, the powder is ensured to have relatively high tap density, thereby improving the volume energy density of the battery; and furthermore, the technical problem of low conductivity of the iron oxide is solved, so that the rate performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic materials and battery materials, and in particular relates to a nitrogen-doped carbon-coated porous hollow bowl-shaped iron oxide material and a preparation method thereof, and a lithium-ion battery negative electrode for high volume energy and cycle stability. Background technique [0002] Iron oxide has the advantages of high theoretical capacity, low toxicity, corrosion resistance, low price and large global reserves, and is considered as a potential material for negative electrodes of lithium-ion batteries, sodium-ion batteries, potassium-ion batteries and other secondary batteries. However, iron oxide has some inherent defects. For example, a large volume change (~96%) during charging and discharging will cause the electrode to break and fall off, and low conductivity will lead to a slow electron transfer rate. Therefore, during the charge-discharge process of ion batteries, ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525
CPCH01M4/366H01M4/523H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 贾宝瑞张自利秦明礼刘鸾赵勇智王永曲选辉吴昊阳
Owner UNIV OF SCI & TECH BEIJING
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