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Metallic titanium and hydrogen doped sodium tin phosphate/carbon composite material as well as preparation method and application thereof

A technology of carbon composite materials and sodium tin phosphate, which is applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of large volume change, low rate performance and specific capacity, and few electrode materials of sodium tin phosphate, etc. problem, achieve the effect of shortening the ion transport path, increasing the chemical active sites, and improving the electrochemical performance

Active Publication Date: 2020-06-23
山东济清科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its electronic conductivity is poor, the volume change is large during the absorption and desorption process, and it is easy to cause capacity decay, and its rate performance and cycle performance are poor, which seriously affects its application.
[0003] At present, there are few studies on sodium tin phosphate electrode materials, Pu Hu(NASICON-Structured NaSn2(PO4)3with Excellent High-rate Properties as Anode Material for Lithium Ion Batteries, Chemistry of Materials.2015,27(19),6668–6674 ) and others synthesized NaSn with a particle size of 100 nm by sol-gel method 2 (PO 4 ) 3 , and used as a negative electrode material for lithium-ion batteries, when the current density is 1.0Ag -1 , its first discharge specific capacity is 300mAh g -1 ; when the current density is 2.0Ag -1 , its first discharge specific capacity is 270mAh g -1 ; Its rate performance and specific capacity are low, and the application effect is relatively poor
Some researchers have also improved its electrochemical performance by doping carbon, but the effect is still unsatisfactory.

Method used

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  • Metallic titanium and hydrogen doped sodium tin phosphate/carbon composite material as well as preparation method and application thereof
  • Metallic titanium and hydrogen doped sodium tin phosphate/carbon composite material as well as preparation method and application thereof
  • Metallic titanium and hydrogen doped sodium tin phosphate/carbon composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation method of metal titanium and hydrogen-doped sodium tin phosphate / carbon composite material, the steps are as follows:

[0048] (1) 0.53g Na 2 CO 3 and 3.45g NH 4 h 2 PO 4 Heat and dissolve in 20mL deionized water, mix and stir for 1 hour to obtain mixed solution A;

[0049] (2) 4.49g SnCl 2 2H 2 O and 1.05g of citric acid were dissolved in 20mL of deionized water, mixed and stirred for 1 hour to obtain mixed solution B;

[0050] (3) Add 5 mL of tetrabutyl titanate dropwise to 10 mL of ethanol while stirring, and stir for 1 hour to obtain solution C;

[0051] (4) Under nitrogen atmosphere protection and heating and stirring conditions, take 0.11mL of step (3) solution C and dropwise add it to step (2) mixed solution B while stirring, mix and stir for 0.5 hours, and then step (1) mixed solution Add A into the system gradually, mix evenly, and stir in a water bath at 80°C for 3 hours to form a gel;

[0052] (5) Grinding the gel obtained in step (4)...

Embodiment 2

[0057] The preparation method of metal titanium and hydrogen-doped sodium tin phosphate / carbon composite material, the steps are as follows:

[0058] (1) 0.53g Na 2 CO 3 and 3.45g NH 4 h 2 PO 4 Heat and dissolve in 20mL deionized water, mix and stir for 30 minutes to obtain mixed solution A;

[0059] (2) 4.50g SnCl 2 2H 2 O and 1.05g of citric acid were dissolved in 20mL of deionized water, mixed and stirred for 40 minutes to obtain mixed solution B;

[0060] (3) Add 5 mL of tetrabutyl titanate dropwise to 10 mL of ethanol while stirring, and stir for 40 minutes to obtain solution C;

[0061] (4) Under nitrogen atmosphere protection and heating and stirring conditions, take 0.02mL of step (3) solution C and add it dropwise to step (2) mixed solution B while stirring, mix and stir for 1 hour, and then step (1) mixed solution Add A into the system gradually, mix evenly, and stir in a water bath at 70°C for 4 hours to form a gel;

[0062] (5) Grinding the gel obtained in...

Embodiment 3

[0066] The preparation method of metal titanium and hydrogen-doped sodium tin phosphate / carbon composite material, the steps are as follows:

[0067] (1) 0.53g Na 2 CO 3 and 3.45g NH 4 h 2 PO 4 Heat and dissolve in 20mL deionized water, mix and stir for 40 minutes to obtain mixed solution A;

[0068] (2) 4.47g SnCl 2 2H 2 O and 1.05g of citric acid were dissolved in 20mL of deionized water, mixed and stirred for 30 minutes to obtain mixed solution B;

[0069] (3) Add 5 mL of tetrabutyl titanate dropwise to 10 mL of ethanol while stirring, and stir for 30 minutes to obtain solution C;

[0070] (4) Under nitrogen atmosphere protection and heating and stirring conditions, take 0.22mL of step (3) solution C and add it dropwise to step (2) mixed solution B while stirring, mix and stir for 40 minutes, and then step (1) mixed solution Add A into the system gradually, mix evenly, and stir in a water bath at 90°C for 2 hours to form a gel;

[0071] (5) Grinding the gel obtaine...

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Abstract

The invention relates to a metallic titanium and hydrogen doped sodium tin phosphate / carbon composite material as well as a preparation method and application thereof. The composite material is of a composite layered structure and is formed by compounding NaSn<2>(PO<4>)<3>, metallic titanium quantum dots and carbon-hydrogen, wherein the mass content of carbon is 3.5%-8%, the mass content of H is 0.3%-0.9%, and the mass content of Ti is 0.02%-0.2%. A sol-gel method is adopted, raw materials such as a tin source and a carbon source with relatively strong reducibility are utilized, and measures such as titanium source preparation and dosage control, raw material mixing and reaction sequence and atmosphere protection, high-temperature carbon thermal reduction reaction and the like are adopted,so doping of metal Ti and H is realized, the Ti-NaSn<2>(PO<4>)<3> / C-H doped composite material containing the composite ultrathin layered structure, the metal titanium quantum dots and the carbon-hydrogen bonds is obtained, the conductivity of sodium tin phosphate is improved, chemical active sites are increased, the volume change in the adsorption and desorption process are buffered, the ion transmission path is shortened, the electrochemical performance of sodium tin phosphate is further improved, and the composite material has a good application prospect.

Description

technical field [0001] The invention relates to a sodium tin phosphate / carbon composite material doped with metal titanium and hydrogen, a preparation method and application thereof, and belongs to the technical field of negative electrode materials of lithium ion batteries. Background technique [0002] Sodium tin phosphate (NaSn 2 (PO 4 ) 3 ) is a NASICON structure composed of SnO 6 Octahedron and PO 4 Composed of tetrahedrons, with large enough ion diffusion channels and stable chemical bonds, and low cost, it is a very potential negative electrode material for lithium-ion batteries. However, its electronic conductivity is poor, its volume changes greatly during the absorption and desorption process, and it is easy to cause capacity decay, and its rate performance and cycle performance are poor, which seriously affects its application. [0003] At present, there are few studies on sodium tin phosphate electrode materials, Pu Hu(NASICON-Structured NaSn2(PO4)3with Exce...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/587H01M10/0525
CPCH01M4/364H01M4/38H01M4/5825H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 张旭东赵倍倍何文
Owner 山东济清科技服务有限公司