Preparation method of polypyrrole coated lithium titanium phosphate anode material

A technology for coating lithium titanium phosphate and negative electrode materials with polypyrrole, which is applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as battery capacity decay, and achieve increased electrical conductivity, good cycle stability, and electrical conductivity. and improved electrochemical performance

Inactive Publication Date: 2018-02-02
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have found that in the presence of oxygen, any material suitable for the negative electrode of aqueous lithium-ion batteries will react with oxygen and water in the discharged state, which is the cause of the capacity fading of aqueous lithium-ion batteries

Method used

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  • Preparation method of polypyrrole coated lithium titanium phosphate anode material
  • Preparation method of polypyrrole coated lithium titanium phosphate anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A polypyrrole-coated titanium lithium phosphate negative electrode material and a preparation method thereof, comprising the following steps:

[0037] (1) Add ammonia water dropwise to the aqueous solution of polypyrrole polystyrene sulfonic acid with a solid content of 2.1wt%, adjust the pH value of the solution to 7, and obtain solution A; wherein, lithium titanium phosphate negative electrode material and polypyrrole The mass ratio is 100:1;

[0038] (2) Mix and dissolve lithium carbonate, tetrabutyl titanate, and lithium dihydrogen phosphate in deionized water, and add it to solution A prepared in step (1), wherein lithium in lithium carbonate, titanium in tetrabutyl titanate The molar ratio between phosphorus and lithium dihydrogen phosphate is 1:2:2; stir and disperse at a high speed of 2300 rpm in a high-speed mixer for 5 minutes to obtain slurry B, and the solid content of the slurry is 25wt%;

[0039] (3) Stir the slurry B obtained in step (2) for 6 hours in a w...

Embodiment 2

[0043] A polypyrrole-coated titanium lithium phosphate negative electrode material and a preparation method thereof, comprising the following steps:

[0044] (1) Add ammonia water dropwise to an aqueous solution of polypyrrole polystyrene sulfonic acid with a solid content of 2.0wt%, adjust the pH value of the solution to 8, and obtain solution A; wherein, lithium titanium phosphate negative electrode material and polypyrrole The mass ratio is 85:1;

[0045] (2) Mix and dissolve lithium carbonate, titanium dioxide, and ammonium dihydrogen phosphate in deionized water, and add it to the solution A prepared in step (1), in which lithium in lithium carbonate, titanium in titanium dioxide, and phosphorus in ammonium dihydrogen phosphate The molar ratio between is 1:2:2.1; In the high-speed mixer with the speed of 3000rpm high-speed stirring dispersion 5min, obtain slurry B, the solid content of slurry is 30wt%;

[0046] (3) Stir the slurry B obtained in step (2) for 8 hours in a ...

Embodiment 3

[0050] (1) Add ammonia water dropwise to an aqueous solution of polypyrrole polystyrenesulfonic acid with a solid content of 2.1wt%, and adjust the pH value of the solution to 9 to obtain solution A; wherein, lithium titanium phosphate negative electrode material and polypyrrole The mass ratio is 95:1;

[0051] (2) Mix and dissolve lithium sulfate, titanium phosphate, and ammonium dihydrogen phosphate in deionized water, and add it to the solution A prepared in step (1), in which lithium in lithium sulfate, titanium in titanium phosphate, and ammonium dihydrogen phosphate The molar ratio between the phosphorus is 1:3:4; In the high-speed mixer with the speed of 4000rpm high-speed stirring dispersion 3min, obtain slurry B, the solid content of slurry is 35wt%;

[0052] (3) Stir the slurry B obtained in step (2) for 9 hours in a water bath at 75°C to obtain a gel; dry the gel at 70°C under vacuum, grind and pulverize to obtain a precursor;

[0053] (4) The precursor obtained in...

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Abstract

The invention discloses a preparation method of a polypyrrole coated lithium titanium phosphate anode material. The method includes: firstly adding ammonia water or a lithium hydroxide solution dropwise into an aqueous solution of polypyrrole, adjusting the solution pH value to obtain a solution A, mixing and dissolving a lithium source, a titanium source and a phosphorus source in a dispersant, then adding the mixture into the solution A, and conducting high speed stirring and dispersion to obtain a slurry B, performing stirring under a water bath condition to obtain gel, carrying out vacuumdrying and grinding crushing to obtain a precursor, and finally calcining the precursor in air atmosphere to obtain the polypyrrole coated lithium titanium phosphate anode material. According to the preparation method provided by the invention, the raw materials have low price, the prepared material has evenly coated surface, obviously improved conductivity, and good cyclic stability in an aqueouselectrolyte solution. Also because of the high conductivity characteristic of a macromolecular conductive polymer, the coated material has greatly improved conductivity and electrochemical performance. The preparation method is simple and practicable, the production process is green and environment-friendly, and is easy for industrial popularization.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a preparation method of a polypyrrole-coated titanium lithium phosphate negative electrode material. Background technique [0002] Since its commercialization in 1990, lithium-ion batteries using lithium-ion intercalation compounds and organic electrolytes have rapidly occupied the small battery market due to their high specific energy advantages, and have been widely used in information and communication devices such as cameras, notebook computers, and mobile phones. The traditional lithium-ion battery has a high energy density, which can reach 120-200 Wh / Kg, but the organic electrolyte used has poor conductivity, high cost, and harsh production conditions, especially its safety cannot be absolutely guaranteed. limit. In 1994, Dahn's research group first reported a lithium-ion battery using an aqueous solution as the electrolyte in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/36
CPCH01M4/366H01M4/5825H01M4/624H01M4/628H01M10/36Y02E60/10
Inventor 朱文婷
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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