Nitrogen and phosphorus co-doped carbon coated MoO3-x and preparation method thereof

A co-doping, carbon-coated technology, applied in active material electrodes, electrical components, electrochemical generators, etc., can solve the problem that electrospinning cannot be mass-produced, the preparation of spinning slurry is complicated, and the electrochemical stability is insufficient. problems, to achieve the effect of loose experimental conditions, improved purity, and low cost

Active Publication Date: 2018-08-10
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

Chinese patent CN 102623687A discloses a method for preparing a high-capacity molybdenum dioxide negative electrode material and its application. The method uses a combination of electrospinning and heat treatment to prepare molyb

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  • Nitrogen and phosphorus co-doped carbon coated MoO3-x and preparation method thereof
  • Nitrogen and phosphorus co-doped carbon coated MoO3-x and preparation method thereof
  • Nitrogen and phosphorus co-doped carbon coated MoO3-x and preparation method thereof

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Example Embodiment

[0025] The invention relates to a carbon-coated MoO co-doped with nitrogen and phosphorus 3-x The preparation method includes the following steps:

[0026] (1) Add phosphomolybdic acid to deionized water and stir evenly to prepare a phosphomolybdic acid solution with a concentration of 1~2.5mg / ml;

[0027] (2) Add N-methylimidazole to the phosphomolybdic acid solution, the molar ratio of the added N-methylimidazole to the step (1) phosphomolybdic acid is 3:1, stir for 7-12h to obtain a yellow precipitate;

[0028] (3) Centrifugally separate the yellow precipitate of step (2) to obtain the separated product. Wash the separated product with a mixed solution of cyclohexane and ethanol 3-5 times to remove impurities to obtain a reaction product. The volume ratio is (2-5):1.

[0029] (4) Vacuum drying the reaction product obtained in step (3) for 7-10 hours at a drying temperature of 40-70°C to obtain a dried product.

[0030] (5) The dried product obtained in step (4) is calcined under an ...

Example Embodiment

[0032] Example 1

[0033] 1) Add 100mg of phosphomolybdic acid to 40mL of deionized water and stir evenly to prepare a phosphomolybdic acid solution with a concentration of 2.5mg / mL;

[0034] 2) Add 12.4 mg of N-methylimidazole to the phosphomolybdic acid solution and stir for 7 hours to obtain a yellow precipitate;

[0035] 3) Centrifuge the yellow precipitate to obtain a centrifuged product, wash the centrifuged product with a mixed solution of cyclohexane and ethanol 3 times to remove impurities to obtain a reaction product; wherein the volume ratio of cyclohexane and ethanol is 3:1;

[0036] 4) Vacuum drying the reaction product obtained in step 3) at 50° C. for 7 hours to obtain a dried product;

[0037] 5) The dried product of step 4) was calcined in an argon atmosphere for 2 hours at a calcining temperature of 400°C to obtain nitrogen-phosphorus co-doped carbon coated MoO 3-x nanomaterials.

[0038] Nitrogen and phosphorus co-doped carbon coated MoO prepared by the data of this em...

Example Embodiment

[0039] Example 2

[0040] 1) Add 100 mg of phosphomolybdic acid to 50 mL of deionized water, and stir evenly to prepare a phosphomolybdic acid solution with a concentration of 2 mg / mL;

[0041] 2) Add 12.4 mg of N-methylimidazole to the phosphomolybdic acid solution and stir for 12 hours to obtain a yellow precipitate;

[0042] 3) Centrifuge the yellow precipitate to obtain a centrifuged product, wash the centrifuged product with a mixed solution of cyclohexane and ethanol 5 times to remove impurities to obtain a reaction product; wherein the volume ratio of cyclohexane and ethanol is 3:1;

[0043] 4) Vacuum drying the reaction product obtained in step 3) at 50°C for 8 hours to obtain a dried product;

[0044] 5) The dried product of step 4) was calcined in an argon atmosphere for 2 hours at a calcining temperature of 400°C to obtain nitrogen-phosphorus co-doped carbon coated MoO 3-x nanomaterials.

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Abstract

The invention discloses nitrogen and phosphorus co-doped carbon coated MoO3-x and a preparation method thereof. Phosphomolybdic acid and N-methyl imidazole serve as raw materials, a yellow precipitateis prepared through precipitation in the preparation process, and impurities in the process products are washed with a mixed solution of cyclohexane and ethanol, so the purity of the reaction products is improved; a nitrogen and phosphorus co-doped carbon coated MoO3-x composite material is prepared by a calcining method; and the whole preparation process is simple in technology, loose in experimental condition, low in cost and suitable for large-scale production. The nitrogen and phosphorus co-doped carbon coated MoO3-x composite material is molybdenum trioxide containing oxygen vacancy, theoxygen vacancy serves as a shallow donor and the density of current carriers can be increased, so that the electrical conductivity of the material can be improved. According to discovery from that the nitrogen and phosphorus co-doped carbon coated MoO3-x composite material is subjected to charge and discharge capacity test under 100 mA/g, the specific discharge capacity and the specific charge capacity are 1077 mAh g<-1> and 787 mAh g<-1>, and the prepared composite material has excellent electrochemical activity.

Description

【Technical field】 [0001] The invention belongs to the field of preparation of inorganic nanomaterials, in particular to a nitrogen-phosphorus co-doped carbon-coated MoO 3-x and its preparation method. 【Background technique】 [0002] In recent years, the excessive use of fossil energy has brought many environmental problems, and the development and use of new sustainable clean energy is an inevitable trend of my country's development. However, there are certain technical obstacles in the storage and output of these clean energy sources. Therefore, the development of energy storage devices with excellent performance is the focus of many researchers. Among them, lithium-ion batteries are currently the most widely studied energy storage devices. Anode materials are an important part of lithium-ion batteries. The anode materials for commercial lithium-ion batteries are mainly graphite, but the theoretical specific capacity of graphite is low (372mAh / g), which restricts the real...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/48H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 张利锋神克超贺文杰刘毅郭守武
Owner SHAANXI UNIV OF SCI & TECH
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