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Membrane functional material for improving performance of lithium metal battery as well as preparation and application of membrane functional material

A technology for lithium metal batteries and functional materials, applied in nanotechnology for materials and surface science, battery pack components, circuits, etc., can solve problems such as difficult synthesis, affect nanoscale performance, etc. Cyclic stability and improved safety effects

Active Publication Date: 2022-03-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Few reports have explored chemical approaches to synthesize nanostructured forms of these nitrides, which are more difficult to synthesize than the corresponding oxides, requiring stringent anaerobic and anhydrous conditions and higher temperatures, which lead to grain growth, which seriously affects its nanoscale properties, especially tungsten trinitride

Method used

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  • Membrane functional material for improving performance of lithium metal battery as well as preparation and application of membrane functional material
  • Membrane functional material for improving performance of lithium metal battery as well as preparation and application of membrane functional material
  • Membrane functional material for improving performance of lithium metal battery as well as preparation and application of membrane functional material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0039]A method for preparing a separator functional material for improving the performance of lithium metal batteries, comprising the following steps:

[0040] Step 1: 3mmol sodium tungstate, 6mmol potassium sulfate, and 1mmol sodium citrate are used as raw materials, hydrochloric acid is used as a pH regulator, and distilled water is used as a solvent;

[0041] Step 2: Dissolve the above-mentioned potassium sulfate, sodium tungstate, and sodium citrate in 70 mL of distilled water containing 60 mg of graphene oxide, stir until the solid raw materials are completely dissolved, and then adjust the pH to 1-2 with hydrochloric acid to obtain a mixed solution and adjust the acidity The concentration of hydrochloric acid is 3mol / L;

[0042] Step 3: Pour the mixed solution obtained in Step 2 into a 100mL reaction kettle, and conduct a hydrothermal reaction at 160°C for 18 hours; after the hydrothermal reaction is completed, naturally cool to room temperature, filter, wash, and freeze...

Embodiment 2

[0047] A method for preparing a separator functional material for improving the performance of lithium metal batteries, comprising the following steps:

[0048] Step 1: Use 6mmol sodium tungstate, 14mmol potassium sulfate, and 4mmol sodium citrate as raw materials, hydrochloric acid as a pH regulator, and distilled water as a solvent;

[0049] Step 2: Dissolve the above-mentioned potassium sulfate, sodium tungstate, and sodium citrate in 70 mL of distilled water containing 100 mg of graphene oxide, stir until the solid raw materials are completely dissolved, and then adjust the pH to 1-2 with hydrochloric acid to obtain a mixed solution and adjust the acidity The concentration of hydrochloric acid is 6mol / L;

[0050] Step 3: Pour the mixed solution obtained in step 2 into a 100mL reaction kettle, and conduct a hydrothermal reaction at 200°C for 36 hours; after the hydrothermal reaction is completed, naturally cool to room temperature, filter, wash, and freeze-dry to obtain tun...

Embodiment 3

[0055] A method for preparing a separator functional material for improving the performance of lithium metal batteries, comprising the following steps:

[0056] Step 1: Use 5mmol sodium tungstate, 10mmol potassium sulfate, and 2.5mmol sodium citrate as raw materials, hydrochloric acid as a pH regulator, and distilled water as a solvent;

[0057] Step 2: Dissolve the above-mentioned potassium sulfate, sodium tungstate, and sodium citrate in 70mL of distilled water containing 80mg of graphene oxide, stir until the solid raw material is completely dissolved, then adjust the pH to 1.5 with hydrochloric acid to obtain a mixed solution, and adjust the acidity with hydrochloric acid The concentration is 3~6mol / L;

[0058] Step 3: Pour the mixed solution obtained in step 2 into a 100mL reaction kettle, and conduct a hydrothermal reaction at 180°C for 24 hours; after the hydrothermal reaction, naturally cool to room temperature, filter, wash, and freeze-dry to obtain tungsten oxide and...

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Abstract

The invention discloses a diaphragm functional material for improving electrochemical performance of a lithium metal battery as well as preparation and application of the diaphragm functional material. The preparation method comprises the following steps: (1) dissolving sodium tungstate, potassium sulfate and sodium citrate in an aqueous solution containing graphene oxide; (2) adjusting the pH value of the solution; (3) pouring into a reaction kettle, and carrying out hydrothermal reaction; (4) after finishing, cooling to room temperature, filtering, cleaning, and freeze-drying to obtain a tungsten oxide and graphene oxide compound precursor; (5) carrying out ammoniation treatment on the precursor in an ammonia gas atmosphere, and cooling to room temperature to obtain the tungsten nitride embedded nitrogen-doped graphene nanoflower; according to the method, a tungsten precursor is synthesized through a complex surfactant assisted hydrothermal method for the first time, then the tungsten nitride embedded nitrogen-doped graphene nano-powder body is obtained through ammoniation, raw materials are green and environmentally friendly, reaction conditions are mild, repeatability is good, large-scale production can be achieved, and the method is suitable for industrial production. And the electrochemical performance of the lithium metal battery can be obviously improved by using the composite material as a diaphragm functional layer of the lithium metal battery.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation and application in batteries, and in particular relates to a preparation method of nitrogen-doped graphene nanoflowers embedded with ditungsten trinitride. Background technique [0002] In recent years, transition metal nitrides have been increasingly studied and applied in various fields because of their unique high melting point (>2000K), special hardness (>10GPa), good catalytic activity, chemical stability, and radiation resistance. industrial applications, and achieved certain results. Among the many known nitrides, boron, silicon, titanium, and gallium nitride have received extensive research and considerable attention, especially in the fields of electronics and semiconductors. However, although tungsten nitride has been successfully applied to stabilize thin-film resistors and metal diffusion barriers, little research has been done on tungsten nitride and few report...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/431C01B32/182C01G41/00B82Y30/00B82Y40/00
CPCH01M50/403H01M50/431C01B32/182C01G41/00B82Y30/00B82Y40/00Y02E60/10
Inventor 陈远富张小娟马飞张子恒王滨陈鑫刘大维
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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