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Molybdenum trioxide material with flower-like multi-level structure induced by nickel-titanium alloy and its preparation method and application

A nickel-titanium alloy and molybdenum trioxide technology, applied in structural parts, electrochemical generators, electrical components, etc., can solve the problem of poor cycle performance and rateability of negative electrode materials, unfavorable application and production, and can not meet the volume change of negative electrode materials. Electrode structure Integrity requirements and other issues, to achieve the effect of easy operation, improved cycle stability, and enhanced electrical conductivity

Active Publication Date: 2020-09-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method usually needs to remove the template after the reaction, and the added surfactants are all polymer insulating materials, which need to be further compounded with conductive materials, which is not conducive to practical application and production
[0007] In summary, neither of the above approaches alone is a good solution to MoO 3 The problem of poor cycle performance and rate performance of negative electrode materials
The reason is that using the above method alone can only improve its performance to a certain extent, and cannot meet the huge volume change and the structural integrity of the electrode during the long-term cycle of the negative electrode material.

Method used

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  • Molybdenum trioxide material with flower-like multi-level structure induced by nickel-titanium alloy and its preparation method and application
  • Molybdenum trioxide material with flower-like multi-level structure induced by nickel-titanium alloy and its preparation method and application
  • Molybdenum trioxide material with flower-like multi-level structure induced by nickel-titanium alloy and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Analytical pure (NH 4 ) 6 Mo 7 o 24 4H 2 O (1.52g) was dissolved in deionized water (50mL), and stirred magnetically at 200 rpm for 15 minutes to obtain solution A;

[0043] (2) Under magnetic stirring, add 9.1mL dropwise to the solution A obtained in step (1) with a concentration of 65% HNO 3 , to obtain solution B;

[0044] (3) under magnetic stirring, add 0.228g, 60nm spherical NiTi alloy (the mass percent of Ni in the alloy composition is 55%) powder to the solution B obtained in step (2), to obtain solution C;

[0045] (4) The solution C obtained in step (3) was transferred to a tetrafluoroethylene-lined autoclave, and reacted at 180° C. for 24 hours.

[0046] (5) After the reaction is completed and cooled to room temperature, the reaction product obtained in step (4) is collected by centrifugation, washed with water and ethanol three times respectively, and then the reaction product is vacuum-dried at 60°C for 24 hours under a vacuum of 1000 Pa to obtain...

Embodiment 2

[0050] (1) Analytical pure (NH 4 ) 6 Mo 7 o 24 4H 2 O (1.52g) was dissolved in deionized water (50mL), and magnetically stirred at 400 rpm for 12 minutes to obtain solution A;

[0051] (2) Under magnetic stirring, add 9.1 mL dropwise to the solution A obtained in step (1) with a concentration of 50% HNO 3 , to obtain solution B;

[0052] (3) under magnetic stirring, add 0.456g, 100nm near-spherical NiTi alloy (the mass percentage of Ni in the alloy composition is 56%) powder to the solution B obtained in step (2), to obtain solution C;

[0053] (4) The solution C obtained in step (3) was transferred to a tetrafluoroethylene-lined autoclave, and reacted at 210° C. for 3 hours.

[0054] (5) After the reaction is completed and cooled to room temperature, the reaction product obtained in step (4) is collected by centrifugation, washed 5 times with water and ethanol respectively, and then the reaction product is vacuum-dried at 80°C for 12 hours under a vacuum of 4000Pa to ob...

Embodiment 3

[0058] (1) Analytical pure (NH 4 ) 6 Mo 7 o 24 4H 2 O (1.52g) was dissolved in deionized water (50mL), and magnetically stirred at 100 rpm for 18 minutes to obtain solution A;

[0059] (2) Under magnetic stirring, add 9.1 mL dropwise to the solution A obtained in step (1) with a concentration of 30% HNO 3 , to obtain solution B;

[0060] (3) under magnetic stirring, add 0.2g, 120nm spherical NiTi alloy (the mass percentage of Ni in the alloy composition is 54%) powder to the solution B obtained in step (2), to obtain solution C;

[0061](4) The solution C obtained in step (3) was transferred to a tetrafluoroethylene-lined autoclave, and reacted at 150° C. for 16 hours.

[0062] (5) After the reaction is completed and cooled to room temperature, the reaction product obtained in step (4) is collected by centrifugation, washed with water and ethanol for 4 times, and then the reaction product is vacuum-dried at 70°C for 18 hours under a vacuum of 2000Pa to obtain a flower-sh...

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Abstract

The invention discloses a flower-shaped multistage structure molybdenum trioxide material induced by a nickel-titanium alloy and a preparation method and application thereof. At first, (NH4) 6Mo7O24.4H2O aqueous solution and HNO3 are uniformly mix; Then adding 60-120 nm spherical or near-spherical nickel-titanium alloy powder into the aqueous solution, uniformly mixing, transferring the solutionto a tetrafluoroethylene-lined high-pressure reaction kettle, and reacting at 150-210 DEG C for 3-24 hours; At that end of the reaction, aft cooling to room temperature, the reaction product is collect by centrifugation, washed with water and ethanol for several times respectively, and then the product is vacuum dry to obtain flower-like multi-stage structure molybdenum trioxide material. The preparation method of the invention has strong controllability and simple operation, can be used for large-scale production of lithium ion secondary battery electrode material, and can remarkably improvethe cycle and rate performance of the electrode material.

Description

technical field [0001] The invention relates to a molybdenum trioxide (MoO 3 ) material, preparation method and application, belonging to the field of nano functional material and lithium ion secondary battery. Background technique [0002] Lithium ion batteries (Lithium ion batteries, LIBs) are composed of negative electrode (also known as anode) and positive electrode (cathode) materials, and a rechargeable energy storage is realized through the reciprocating intercalation and extraction movement of Li ions between the positive and negative electrodes. storage device. During discharge, Li ions (Li + ) transport current from the anode to the cathode through the nonaqueous electrolyte and separator; during charging, the process goes in the opposite direction. [0003] LIBs have the advantages of high energy density (high specific capacity), light weight, long life, and no memory effect. The specific capacity of lithium-ion batteries is mainly determined by the positive a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/62H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 袁斌闫钰胡仁宗杨黎春刘军朱敏
Owner SOUTH CHINA UNIV OF TECH
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