Niobium tungstate material for high-safety lithium ion battery as well as preparation method and application of niobium tungstate material

A lithium-ion battery, high-safety technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of low output of electrospinning, inability to mass production, and high energy consumption

Inactive Publication Date: 2021-02-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The output of electrospinning method is too low (at the injection speed of 0.03mLmin -1 According to the calculatio

Method used

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  • Niobium tungstate material for high-safety lithium ion battery as well as preparation method and application of niobium tungstate material
  • Niobium tungstate material for high-safety lithium ion battery as well as preparation method and application of niobium tungstate material
  • Niobium tungstate material for high-safety lithium ion battery as well as preparation method and application of niobium tungstate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 1. Preparation: hydrate niobium oxalate, ammonium metatungstate and glycine in a molar ratio (n niobium + n tungsten): n glycine = 0.5, wherein, Nb 2 o 5 : WO 3 Molar ratio=7:3, add 7.5molL -1 in dilute nitric acid and stirred to form a clear solution. Set the temperature of the muffle furnace to 1100°C, put the above reaction solution in a corundum crucible with a cover and put it in the muffle furnace. The solution boils and evaporates rapidly, and generates a flame to undergo a self-propagating combustion reaction. The combustion reaction can be completed within 1 minute, and calcined at 1100 ° C for 30 minutes to increase the crystallinity of the product to obtain Nb 14 W 3 o 44 Material.

[0064] 2. Material performance characterization and electrochemical performance test: The crystal structure of the material is analyzed by XRD diffractometer (using Rigaku MiniFlex600 diffractometer), and the material can be proved to be tetragonal phase Nb through crystal ...

Embodiment 2

[0067] 1. The difference from Example 1 is: the fuel is glucose, Nb 2 o 5 : WO 3 Molar ratio=7:3, (n niobium+n tungsten):n glucose=1:1.

[0068] 2. Electrochemical properties: Figure 5 For Nb in Example 2 14 W 3 o 44 Electrochemical cycle performance of materials. The prepared electrode material was at 0.2Ag -1 Charge and discharge at current density, the reversible capacity can be maintained at 211.1 mAhg after 200 cycles -1 , The capacity retention rate was 96.0%.

Embodiment 3

[0070] The difference from Example 1 is that the temperature of the self-propagating combustion reaction is 1050° C., the time of the self-propagating combustion reaction is 2 minutes, and the calcination time is 40 minutes.

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Abstract

The invention belongs to the technical field of material synthesis and energy, and discloses a niobium tungstate material for a high-safety lithium ion battery as well as a preparation method and application of the niobium tungstate material. The molecular formula of the niobium tungstate material is Nb14W3O44, and the niobium tungstate material is prepared by uniformly mixing hydrated niobium oxalate, ammonium metatungstate and fuel in inorganic acid, carrying out self-propagating combustion reaction at the temperature of 1050-1250 DEG C in an air atmosphere and then carrying out calcinationreaction at the temperature, wherein the fuel is more than one of glycine, urea or glucose. The Nb14W3O44 material prepared by the method has excellent cycle performance, the capacity can be kept at 215.9 mAh g<-1> after 200 cycles at 0.5 C, and the capacity retention rate is as high as 98.1%. The electrochemical stability of the electrode material is obviously superior to that of a conventional Nb14W3O44 material synthesized by a solid-phase method and that of a commercial Li4Ti5O12 material.

Description

technical field [0001] The invention belongs to the field of material synthesis and energy technology, more specifically, relates to a niobium tungstate (Nb 14 W 3 o 44 ) materials and their preparation methods and applications. Background technique [0002] Electrochemical energy is an efficient and clean energy storage and conversion system. Among them, lithium-ion batteries have attracted widespread attention due to their high operating voltage, high energy density, no memory effect, and environmental friendliness. The most concerned research hotspot in the storage field is also considered to be the most promising power battery system for electric vehicles. But it is undeniable that although the application range of lithium-ion batteries is getting wider and wider, its existing working mode still has huge potential safety hazards. Well-known companies in the industry such as SONY, HP, and Dell have recalled a large number of batteries because of the safety problems of...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M10/0525C01G41/00
CPCC01G41/00C01P2002/72C01P2004/03C01P2004/04C01P2006/40H01M4/485H01M10/0525Y02E60/10
Inventor 肖金斐杨阳李成超张宇斐叶明晖耿洪波
Owner GUANGDONG UNIV OF TECH
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