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Nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-like porous material, lithium battery diaphragm, preparation method of lithium battery diaphragm, lithium-sulfur battery and electric equipment

A lithium battery diaphragm and porous material technology, which is applied in the field of nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-shaped porous materials, lithium-sulfur batteries and electrical equipment, can solve problems that cannot be solved well, and achieve stable product performance , good diffusion, low cost effect

Active Publication Date: 2020-06-16
湖南桑瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing technology mostly considers solving the "shuttle effect" problem from the perspective of positive electrode performance, but improving the positive electrode material alone cannot solve this problem well

Method used

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  • Nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-like porous material, lithium battery diaphragm, preparation method of lithium battery diaphragm, lithium-sulfur battery and electric equipment
  • Nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-like porous material, lithium battery diaphragm, preparation method of lithium battery diaphragm, lithium-sulfur battery and electric equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Weigh iron powder and 1,2,3-trimesic acid and put them into a hydrothermal reaction kettle lined with polytetrafluoroethylene, add hydrofluoric acid, nitric acid and pure water, and the molar ratio of each sample is n( iron powder): n(1,2,3-trimesic acid): n(HNO 3 ):n(HF):n(pure water)=3:2:2:7:800, after stirring evenly, place the hydrothermal reactor at 160 ℃ and seal it for 12 hours, cool it down to room temperature naturally, and use deionized Water, DMF, and absolute ethanol were washed three times each, and dried in an oven to obtain iron source A for use.

[0058] figure 1 Electron microscope image of the iron source material prepared in Example 1 of the present invention.

[0059] Weigh 200 mg of iron source A material, dissolve it in 30 mL of ethanol solution, then weigh 834 mg of sodium phytate and 60 mg of urea, stir overnight, and dry in a vacuum oven at 60 °C to obtain the precursor material. A certain mass of precursor material was weighed, placed in a s...

Embodiment 2

[0064] Weigh iron powder and 1,2,3-trimesic acid and put them into a hydrothermal reaction kettle lined with polytetrafluoroethylene, add hydrofluoric acid, nitric acid and pure water, and the molar ratio of each sample is n( iron powder): n(1,2,3-trimesic acid): n(HNO 3 ):n(HF):n(pure water)=6:4:4:10:1000, after stirring evenly, place the hydrothermal reactor at 160 ℃ and seal it for 12 hours, cool it down to room temperature naturally, and use deionized Water, DMF, and absolute ethanol were washed three times each, and dried in an oven to obtain iron source A for use.

[0065] Weigh 200 mg of iron source A material, dissolve it in 30 mL of ethanol solution, then weigh 662 mg of potassium phytate and 90 mg of ethylenediamine, stir overnight, and dry in a vacuum oven at 60 ℃ to obtain the precursor material . A certain mass of precursor material was weighed, placed in a square porcelain boat, and then annealed at 800 °C for 3 hours at a heating rate of 3 °C / min in a nitrogen...

Embodiment 3

[0069] Weigh iron powder and 1,2,3-trimesic acid and put them into a hydrothermal reaction kettle lined with polytetrafluoroethylene, add hydrofluoric acid, nitric acid and pure water, and the molar ratio of each sample is n( iron powder): n(1,2,3-trimesic acid): n(HNO 3 ):n(HF):n(pure water)=4:3:3:5:600, after stirring evenly, place the hydrothermal reactor at 160 ℃ and seal it for 12 hours, cool it down to room temperature naturally, and use deionized Water, DMF, and absolute ethanol were washed three times each, and dried in an oven to obtain iron source A for use.

[0070] Weigh 200 mg of iron source A material, dissolve it in 30 mL of ethanol solution, then weigh 344 mg of zinc phytate and 120 mg of dimethylamine, stir overnight, and dry in a vacuum oven at 60°C to obtain the precursor material . A certain mass of precursor material was weighed, placed in a square porcelain boat, and then annealed at 900 °C for 5 hours at a heating rate of 5 °C / min in an argon atmospher...

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Abstract

The invention provides a nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-like porous material, a lithium battery diaphragm, a preparation method of the lithium batterydiaphragm, a lithium-sulfur battery and electric equipment. A preparation method of the nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-like porous material comprises the following steps: mixing raw materials including an iron source, a nitrogen-containing organic matter, phytate and an organic solvent, and drying to obtain a precursor; and carrying out heating treatment on the precursor to obtain the nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-like porous material for the lithium-sulfur battery diaphragm. The preparation method of the lithium battery diaphragm comprises the following steps: mixing raw materials including the nitrogen-phosphorus doped carbon composite iron phosphide three-dimensional rod-like porous material, a binder and a solvent and dispersing to obtain coating slurry; and coating the surface of a diaphragm base material with the coating slurry to obtain the lithium battery diaphragm. According to the nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-like porous material, the lithium battery diaphragm, the preparation method of the lithium battery diaphragm and thelithium-sulfur battery, the shuttle effect can be effectively solved, and the electrochemical performance of the lithium-sulfur battery is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a nitrogen-phosphorus-doped carbon-composite iron phosphide three-dimensional rod-shaped porous material, a lithium battery diaphragm and a preparation method, a lithium-sulfur battery and electrical equipment. Background technique [0002] Lithium-sulfur (Li-S) battery is an electrochemical energy storage system with sulfur as the positive electrode (theoretical specific capacity 1675mAh / g) and lithium as the negative electrode (theoretical specific capacity 3860mAh / g), and the sulfur positive electrode is cheap and environmentally friendly . In recent years, lithium-sulfur batteries have attracted more and more attention as an advanced lithium-ion battery. [0003] However, there are still many serious problems to be solved for lithium-sulfur batteries. For example, polysulfides generated during charging and discharging are dissolved in the electrolyte and will diffuse re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B25/08H01M2/14H01M2/16H01M10/0525
CPCC01B25/08C01P2004/12C01P2004/30C01P2004/50C01P2004/61C01P2004/80C01P2006/40C01B32/05H01M10/0525H01M50/403H01M50/431Y02E60/10
Inventor 王浩邓多唐泽勋商士波
Owner 湖南桑瑞新材料有限公司
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