A niobium-based oxide material, its preparation method and application

A negative electrode material and reactor technology, which is applied in the field of niobium-based oxide materials, can solve the problems of increased lithium intercalation overpotential of graphite negative electrode, unsuitable high-rate charge and discharge, and risk of lithium precipitation in the electrode, so as to increase the active surface area, Good safety and stability, the effect of avoiding the risk of lithium analysis

Active Publication Date: 2022-06-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the lithium intercalation potential is close to the deposition potential of lithium metal, at high current density, the lithium intercalation overpotential of graphite negative electrode increases, so there is a risk of lithium deposition in the electrode, which may cause battery circuit and battery safety problems, so it is not applicable Charge and discharge at high rate

Method used

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  • A niobium-based oxide material, its preparation method and application
  • A niobium-based oxide material, its preparation method and application
  • A niobium-based oxide material, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Nb 2 O 5 Preparation of material (A1):

[0048] Dissolve 0.005mol of niobium oxalate in 90mL of deionized water and 10mL of ethanol, add 0.002g of Pluronic F127 and 0.002g of polyvinylpyrrolidone (molecular weight 40000) and stir until dissolved to obtain a uniform solution; transfer the above solution to the reaction kettle and put it into a microwave In the reactor, the power of the microwave reactor is 1000W. First, the temperature in the reactor rises from room temperature to 100 °C for 10 minutes, and the temperature is kept constant for 5 minutes; then the temperature is continued to rise for 40 minutes to 180 °C, and the constant temperature reaction is performed for 2 hours; after cooling to room temperature, centrifuge to obtain a solid The product was washed twice with deionized water and once with ethanol, and then dried in a vacuum oven at 90 °C for 12 h to obtain a precursor; the obtained precursor was transferred to a corundum crucible, and placed in a mu...

Embodiment 2

[0052] Nb 2 O 5 Preparation of material (A2):

[0053] Nb in Example 2 2 O 5 The difference in the preparation method of material (A2) is that the surfactants are 0.002g Pluronic F127 and 0.002g sodium dodecyl sulfate, and other reaction steps and conditions are the same as those in Example 1.

[0054] Preparation of half-cell (B2):

[0055] with Nb 2 O 5 The steps and conditions for preparing the half-cell (B2) with the material (A2) as the electrode active material are the same as those in Example 1.

Embodiment 3

[0057] Nb 2 O 5 Preparation of material (A3):

[0058] Nb in Example 3 2 O 5 The difference in the preparation method of material (A3) is that the solvent used is 90 mL of deionized water and 10 mL of ethylene glycol, and other reaction steps and conditions are the same as those in Example 1.

[0059] Preparation of half-cell (B3):

[0060] with Nb 2 O 5 The steps and conditions for preparing the half-cell (B3) with the material (A3) as the electrode active material are the same as those in Example 1.

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Abstract

The invention provides a niobium-based oxide material, its preparation method and application. The niobium-based oxide material is Nb with a three-dimensional porous structure 2 o 5 , The size of the niobium-based oxide material is micron, and the micron-sized niobium-based oxide material ensures that the electrode has a high tap density, which is conducive to improving the volume specific energy of the battery and ensuring good safety and stability of the battery.

Description

technical field [0001] The invention relates to the technical field of niobium-based oxide materials, in particular to a niobium-based oxide material, a preparation method and application thereof. Background technique [0002] In recent years, lithium-ion batteries have been widely used in mobile electronic products such as mobile phones, tablet computers, smart wearable devices, digital cameras, etc., and the development of electric vehicles has also brought a broader market for lithium-ion batteries. With the innovation of terminal application technology and the increase of demand, people also put forward higher requirements for the performance of batteries, and high power performance is one of the hotspots in current lithium-ion battery research. [0003] As the main body of lithium-ion battery energy storage, the properties of electrode materials directly determine the performance of the battery. At present, the anode materials used in commercial lithium-ion batteries a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M10/0525
CPCH01M4/48H01M10/0525H01M2004/027Y02E60/10
Inventor 张洪章宋子晗李先锋张华民阎景旺
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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