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A kind of preparation method of tin-doped titanium pyrophosphate

A titanium pyrophosphate, tin doping technology, used in chemical instruments and methods, phosphorus compounds, structural parts, etc.

Active Publication Date: 2021-05-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its electrochemical performance still needs to be further improved.

Method used

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  • A kind of preparation method of tin-doped titanium pyrophosphate
  • A kind of preparation method of tin-doped titanium pyrophosphate
  • A kind of preparation method of tin-doped titanium pyrophosphate

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Effect test

Embodiment 1

[0033] Firstly, add 16mL graphene oxide dispersion liquid into 40mL ethylene glycol solution, stir evenly, and perform ultrasonic treatment for 2 hours; then add 16mL phosphoric acid into the above solution, stir at a speed of 60 r / min for 10min, and mix 0.0156g Tin tetrachloride and 0.68 g tetrabutyl titanate were added to the mixed solution, and stirred at a speed of 60 r / min for 12 h; then the solution was transferred to a 100 mL reactor, and hydrothermally reacted at 160 °C for 3 hours; The reacted solution was suction filtered and washed with pure water three times; the precursor was lyophilized for 24 h; finally, the precursor was calcined at 600 °C for 2 h in an argon atmosphere to obtain Ti 1-x sn x P2O7 (0≤x≤0.05) / rGO composites.

[0034] For the Ti prepared in this example 1-x sn x The P2O7 (0≤x≤0.05) / rGO composite was scanned by XRD, and the peak of the composite was consistent with that of the standard card, indicating that the target product was a pure phase. ...

Embodiment 2

[0041] First, add 16mL of phosphoric acid into 40mL of ethylene glycol solution, stir at a speed of 60 r / min for 10min, and then add 0.0156g of tin tetrachloride and 0.68g of tetrabutyl titanate into the mixed solution after the two are evenly mixed, Stir at a speed of 60 r / min for 12 h; then transfer the solution to a 100 mL reactor, and conduct a hydrothermal reaction at 160 °C for 3 hours; centrifuge the reacted solution at a speed of 5000 r / min, and wash with pure water for 3 h. times; the centrifuged precursor was dried in an oven at 90°C for 3 hours; finally, the precursor was calcined at 700°C under an argon atmosphere for 2 hours to obtain Ti 1-x sn x P 2 o 7 (0≤x≤0.05).

[0042] The Ti prepared in this example 1-x sn x P 2 o 7 (0≤x≤0.05) is fully ground with acetylene black and PVDF according to the mass ratio of 7:2:1, and then a proper amount of NMP is added to stir evenly to form a slurry; then the slurry is coated on the aluminum foil current collector and ...

Embodiment 3

[0044] First, add 0.2218g of glucose into 40mL of ethylene glycol solution and stir until it is completely dissolved; add 16mL of phosphoric acid into the above solution, stir at a speed of 60 r / min for 10min, and mix 0.0156g of tin tetrachloride and 0.68g of Tetrabutyl titanate was added to the mixed solution, stirred at a speed of 60 r / min for 12 h; then the solution was transferred to a 100 mL reactor, and hydrothermally reacted at 160 °C for 3 hours; the reacted solution was centrifuged, The rotation speed was 5000 r / min, and the pure water was washed 3 times; the centrifuged precursor was dried in an oven at 90 °C for 3 h; finally, the precursor was calcined at 600 °C under an argon atmosphere for 2 h to obtain Ti 1-x sn x P2O7 (0≤x≤0.05) / C composites.

[0045] Ti 1-x sn x P2O7 (0≤x≤0.05) / C composite material is scanned, and the results are as follows figure 2 As can be seen from the figure, it is spherical particles with uniform distribution and regular shape.

[00...

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Abstract

A preparation method of tin-doped titanium pyrophosphate, the preparation method uses titanium source, tin source and phosphorus source as raw materials to carry out hydrothermal reaction to prepare a titanium pyrophosphate precursor, and then place the titanium pyrophosphate precursor in a non-oxidizing atmosphere Preparation of the tin-doped titanium pyrophosphate Ti under sintering 1‑ x sn x P 2 o 7 Further, the preparation method of the present invention can also add carbon source while adding phosphorus source, prepare and obtain carbon-containing tin-doped titanium pyrophosphate, improve the conductivity of this titanium pyrophosphate, and further improve its electrochemical activity; adopt The negative electrode material prepared by mixing tin-doped titanium pyrophosphate with acetylene black and binder has excellent electrochemical performance, and the first charge and discharge specific capacity reaches 900 mAh g ‑1 , after 150 charge-discharge cycles, it can still maintain 400 mAh g ‑1 specific capacity.

Description

technical field [0001] The invention relates to the field of preparation of battery negative electrode materials, in particular to a preparation method of tin-doped titanium pyrophosphate. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high energy density, high stability, and long life, and have been widely used in portable electronic products, electric vehicles and other fields. However, its performance largely depends on the electrode material, and the anode material is the key electrode material of lithium-ion batteries, so the research and development of anode materials with excellent performance is the focus of many scientific researchers. The capacity of traditional graphite negative electrodes is low, which cannot meet the high capacity requirements of modern batteries; graphene materials are limited in their further promotion and use due to high preparation costs and high process requirements; The expansion effect ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/42H01M4/58H01M4/62H01M10/0525
CPCC01B25/42C01P2004/32C01P2004/62C01P2006/40H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 张佳峰季冠军张建永欧星黄灿灿张宝彭春丽
Owner CENT SOUTH UNIV
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