Phosphorus quantum dot composite porous hard carbon material and its preparation method and application

A technology of phosphorus quantum and porous carbon, which is applied to phosphorus quantum dot composite porous hard carbon materials and their preparation, and the application field of lithium metal ion battery anode materials, which can solve the large volume change, unstable structure, and easy pulverization failure of phosphorus materials and other issues, to achieve the effect of wide material sources, low cost, and improved rate performance and cycle performance

Active Publication Date: 2020-08-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in general, the combination mechanism of phosphorus and carbon in the preparation process has not been fully explained. The phosphorus particles are larger, the binding force with carbon materials is poor, and the deposition is uneven during the coupling process with carbon materials, which limits its capacity. At the same time, the inherent volume change of phosphorus materials is large, the structure is unstable, and the situation of easy pulverization and failure has not been solved well.

Method used

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  • Phosphorus quantum dot composite porous hard carbon material and its preparation method and application
  • Phosphorus quantum dot composite porous hard carbon material and its preparation method and application
  • Phosphorus quantum dot composite porous hard carbon material and its preparation method and application

Examples

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Effect test

Embodiment 1

[0038] (1) Weigh 10g of soybeans, mix them with 100ml of deionized water, and make high-concentration soybean milk (syrup precursor). Soymilk can be pressed into "tofu" with different densities by using the method of making tofu with brine. After moderate drying, slice and freeze-dry in a freeze dryer for 5 days, then react in a tube furnace at 1200°C for 2 hours under the protection of high-purity argon to obtain Soy-made porous carbon material after carbonization.

[0039] (2) Put 8g red phosphorus and 70ml deionized water in a hydrothermal reaction kettle, 200 o C under hydrothermal reaction for 24h, the hydrothermal reaction was carried out, and then the precipitate was collected by filtration. Prepare 0.5mol L -1 urea aqueous solution, dissolve the precipitate in urea aqueous solution, settle for 5min and take the supernatant. Use a centrifuge to further disperse and centrifuge the supernatant at 8000 r / min for 30 minutes to obtain the final supernatant containing phos...

Embodiment 2

[0044] (1) Weigh 10g of lobster shell, mix it with 100ml of deionized water and beat it into a slurry precursor at high speed. Put the slurry precursor into a freeze dryer for 4 days and freeze-dry it for 4 days, then react in a tube furnace at 1000 °C for 2 h under the protection of high-purity argon to obtain a carbonized porous carbon material.

[0045] (2) Put 5g red phosphorus and 65ml deionized water in a hydrothermal reaction kettle, 200 o C under hydrothermal reaction for 36h, hydrothermal reaction was carried out, and then the precipitate was collected by filtration. Prepare 1 mol L -1 urea aqueous solution, the precipitate was dissolved in urea aqueous solution, and the supernatant was taken after settling for 15 minutes. Use a centrifuge to further disperse and centrifuge the supernatant at 6000 r / min for 40 minutes to obtain the final supernatant containing phosphorus quantum dots.

[0046] (3) Mix 2 g of the carbonized porous carbon material with 10 ml of the s...

Embodiment 3

[0048] (1) Weigh 50g of apples, mix with 50ml of deionized water and make a slurry precursor. The slurry precursor was placed in a freeze dryer for 5 days and then reacted in a tube furnace at 1200 °C for 2 h under the protection of high-purity argon to obtain N-doped porous carbon.

[0049] (2) Put 8g red phosphorus and 70ml deionized water in a hydrothermal reaction kettle, 150 o C under hydrothermal reaction for 40 h, and the precipitate was collected by filtration after the hydrothermal reaction. Prepare 0.1mol L -1 urea aqueous solution, dissolve the precipitate in urea aqueous solution, settle for 5min and take the supernatant. Use a centrifuge to further disperse and centrifuge the supernatant at 8000 r / min for 30 minutes to obtain the final supernatant containing phosphorus quantum dots.

[0050] (3) Mix 1 g of the carbonized porous carbon material with 10 ml of the supernatant and dry it to obtain a porous carbon material doped with phosphorus quantum dots.

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Abstract

The invention provides a phosphorus quantum dot composited porous hard carbon material, a preparation method thereof, and an application of same as an anode material of a lithium ion battery. The method includes: performing direct carbonization on a bio-precursor, as a raw material, to prepare porous hard carbon; performing heat flow dispersion to prepare a phosphorus quantum dot solution; mixingand drying the two components to obtain the phosphorus quantum dot doped porous hard carbon anode material. By compounding the carbon material, electric-conductivity of the phosphorus is increased; due to the porous structure, expansion of the phosphorus can be adapted, so that the material has better electro-chemical performances. The material can improve the specific capacity and cycling stability of an alkaline metal ion battery. The composite anode material can improve the rate capacity and cycle performance of an alkaline metal ion secondary battery, so that development of high-energy-density and high-stability alkaline metal ion secondary batteries can be improved.

Description

technical field [0001] The invention relates to the technical field of alkali metal ion (lithium, sodium, potassium) secondary battery negative electrode materials, in particular to a phosphorus quantum dot composite porous hard carbon material, a preparation method thereof, and an application as a lithium metal ion battery negative electrode material. Background technique [0002] Achieving safe, economical, environmentally friendly, and sustainable energy storage devices has become a major scientific challenge in the 21st century. Alkali metal batteries are widely used in a variety of portable electronic devices and energy storage systems. With the development of science and technology worldwide, alkaline metal battery technology still cannot meet the growing demand. [0003] The negative electrode material is an important part of the battery. The commonly used ones are carbonaceous materials, transition metal oxides (sulfides), metal alloys and organic compounds. The cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/625Y02E60/10
Inventor 夏新辉李玉倩章理远王秀丽涂江平
Owner ZHEJIANG UNIV
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