Nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-shaped porous material, lithium battery separator and preparation method, lithium-sulfur battery and electrical equipment

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

Active Publication Date: 2020-09-08
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-shaped porous material, lithium battery separator and preparation method, lithium-sulfur battery and electrical equipment
  • Nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-shaped porous material, lithium battery separator and preparation method, lithium-sulfur battery and electrical 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-shaped porous material, a lithium battery diaphragm and a preparation method, a lithium-sulfur battery and electrical equipment. The preparation method of nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-shaped porous material: mixing raw materials including iron source, nitrogen-containing organic matter, phytate and organic solvent, and drying to obtain a precursor; heating the precursor The nitrogen-phosphorus-doped carbon-composite iron phosphide three-dimensional rod-shaped porous material for the lithium-sulfur battery diaphragm is obtained through processing. The preparation method of the lithium battery diaphragm: mix the raw materials including the nitrogen-phosphorus-doped carbon composite iron phosphide three-dimensional rod-shaped porous material, the binder and the solvent, and disperse to obtain the coating slurry; apply the coating slurry on The surface of the diaphragm base material is obtained to obtain the lithium battery diaphragm. The nitrogen-phosphorus-doped carbon-composite iron phosphide three-dimensional rod-shaped porous material, lithium battery separator and preparation method, and lithium-sulfur battery provided by the application can effectively solve the "shuttle effect" and improve the electrochemical performance of the lithium-sulfur battery.

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 Patents(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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