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Carbon coated prepared titanium phosphate sodium material and preparation and application

A technology of sodium titanium phosphate and carbon coating, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of limited specific energy and low conductivity, and achieve the effect of accelerated transmission, low cost and obvious effect.

Inactive Publication Date: 2018-10-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, due to its low intrinsic conductivity, its conductivity is often improved by carbon coating and compounding with conductive materials, and it is used as a negative electrode material for sodium-ion batteries.
However, since the deposition potential of sodium is 0.4V higher than that of lithium, when sodium titanium phosphate is used as the negative electrode of sodium ion batteries, only the intercalation and extraction reactions of sodium ions can occur, which severely limits its specific energy.

Method used

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  • Carbon coated prepared titanium phosphate sodium material and preparation and application
  • Carbon coated prepared titanium phosphate sodium material and preparation and application
  • Carbon coated prepared titanium phosphate sodium material and preparation and application

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Embodiment

[0025] (1) Dissolve the carbon source and titanium source in absolute ethanol at a molar ratio of 1:1, and stir and mix evenly at 70°C; dissolve the stoichiometric sodium source and phosphorus source in ethanol and then add Add the titanium source and carbon source to the ethanol solution, stir for 3 hours to get the precursor solution, add deionized water to form a gel;

[0026] (2) Dry the gel obtained in (1) at 80°C, and grind to obtain a precursor powder;

[0027] (3) Calcining the precursor powder at 350°C for 4 hours to obtain a pre-carbonized material;

[0028] (4) Calcining the pretreated material at 750° C. for 15 hours to obtain a carbon-coated sodium titanium phosphate material;

[0029] Steps (3) and (4) are calcined in an inert atmosphere, and the gas used in the inert atmosphere is argon; the molar concentration of titanium source in the precursor solution in the preparation process (1) is 0.3mol / L; carbon source: titanium source : Sodium source: the stoichiome...

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Abstract

The invention relates to a preparation method and application of a carbon coated titanium phosphate sodium material. The representing method of the material is NaTi2(PO4)3 / C. By combining in-situ carbon coating and a sol gel method, the carbon coated titanium phosphate sodium material with uniformly-distributed particles and the nanoscale is prepared, and the material is adopted as a negative electrode in a lithium ion battery, and has the good electrochemical capacity. Compared with other negative electrode materials, the material has the advantages of being high in ion conductivity, safe, environmentally friendly, low in price and stable in electrochemical performance, and has the wide application prospect in the technology of high-performance power batteries and electrochemical energy storage batteries.

Description

Technical field: [0001] The invention relates to a carbon-coated sodium titanium phosphate material and its application in lithium ion batteries, belonging to the field of chemical power sources. technical background: [0002] Lithium-ion batteries have the advantages of high specific energy, small self-discharge coefficient, good efficiency, and long cycle life, and are widely used in portable power supply equipment applications and power / hybrid battery applications and research and development. According to the different reaction mechanisms, the anode materials of lithium-ion batteries are mainly divided into three categories: deintercalation anodes, alloy anodes and conversion anode materials. Common commercial carbon materials are intercalation-type negative electrode materials, and lithium ions are intercalated and deintercalated between the layers during charging and discharging. With the development of electric vehicles and large-scale energy storage technology, the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 张华民王怀清冯凯李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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