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Cobalt phosphide molybdenum particle modified nitrogen-phosphorus co-doped carbon composite material and preparation method and application thereof

A carbon composite material, cobalt molybdenum phosphide technology, applied in the direction of nanotechnology for materials and surface science, electrochemical generators, active material electrodes, etc., can solve the problem of high synthesis cost, unfavorable commercial production, and complex synthesis process problems such as low production cost, good practical application value, and ease of volume change

Active Publication Date: 2020-09-25
SHANDONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, the inventors found that the current synthesis process of bimetallic phosphide materials is relatively complicated, and the synthesis cost is high, which is not conducive to commercial production

Method used

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  • Cobalt phosphide molybdenum particle modified nitrogen-phosphorus co-doped carbon composite material and preparation method and application thereof
  • Cobalt phosphide molybdenum particle modified nitrogen-phosphorus co-doped carbon composite material and preparation method and application thereof
  • Cobalt phosphide molybdenum particle modified nitrogen-phosphorus co-doped carbon composite material and preparation method and application thereof

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preparation example Construction

[0033] In yet another specific embodiment of the present invention, a method for preparing the nitrogen-phosphorus co-doped carbon composite material modified by the above cobalt-molybdenum phosphide particles is provided, the preparation method comprising:

[0034] Disperse cobalt salt, molybdenum salt, organic matrix and phosphorus-containing inorganic acid in water evenly, and dry to obtain the precursor;

[0035] The nitrogen-phosphorus-loaded carbon composite material modified by cobalt-molybdenum-phosphide particles is obtained by heat-treating the prepared precursor.

[0036] The above method has simple preparation process, less pollution, no additional phosphorus source and nitrogen source, and large yield, which can provide effective benefits for the large-scale production and practical application of bimetallic phosphide materials. And the prepared cobalt-molybdenum-phosphide particle-modified nitrogen-phosphorus co-doped carbon composite material can show better spe...

Embodiment 1

[0052] The nitrogen-phosphorus co-doped carbon composite material modified by cobalt and molybdenum phosphide particles is prepared by the following steps:

[0053] (1) Preparation of precursor:

[0054] Mix 1 mmol of cobalt nitrate hexahydrate, 0.13 mmol of ammonium molybdate, 4 g of urea, 200 mg of glucose and 2 mmol of phosphoric acid, dissolve in 40 mL of deionized water, and stir until clear and transparent without solids. The mixed liquid was dried in a blast oven at 80°C until no liquid existed, and finally dried in a vacuum oven at 60°C for 12 hours.

[0055] (2) Preparation of nitrogen and phosphorus co-doped carbon composites modified with cobalt and molybdenum phosphide particles

[0056] Place the precursor prepared in step 1 in a tube furnace in a nitrogen atmosphere at 3 °C min -1 The heating rate is increased from room temperature to 900°C, and the temperature is maintained for 2 hours, and the nitrogen-phosphorus co-doped carbon composite material modified by...

Embodiment 2

[0061] The nitrogen-phosphorus co-doped carbon composite material modified by cobalt and molybdenum phosphide particles is prepared by the following steps:

[0062] (1) Preparation of precursor:

[0063] Mix 0.5mmol of cobalt nitrate hexahydrate, 0.1mmol of ammonium molybdate, 4g of urea, 200mg of glucose and 2mmol of phosphoric acid, dissolve in 40mL of deionized water, and stir until clear and transparent without solids. The mixed liquid was dried in a blast oven at 80°C until no liquid existed, and finally dried in a vacuum oven at 60°C for 12 hours.

[0064] (2) Preparation of nitrogen and phosphorus co-doped carbon composites modified with cobalt and molybdenum phosphide particles

[0065] Place the precursor prepared in step 1 in a tube furnace in a nitrogen atmosphere at 3 °C min -1 The heating rate is raised from room temperature to 900°C, and the temperature is kept at 900°C for 2 hours to obtain a nitrogen-phosphorus co-doped carbon composite material modified by c...

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Abstract

The invention provides a cobalt phosphide molybdenum particle modified nitrogen-phosphorus co-doped carbon composite material and a preparation method and application thereof, which belong to the technical field of electrochemistry and new energy. The cobalt phosphide molybdenum particle modified nitrogen-phosphorus co-doped carbon composite material is formed by stacking carbon materials, so thata large number of three-dimensional spaces are formed; the cobalt phosphide molybdenum particles are embedded in a carbon matrix, and the size of the cobalt phosphide molybdenum particles is nanoscale. The cobalt molybdenum phosphide has a large number of electrochemical active sites, is excellent in conductivity, and can promote electrochemical reaction and improve the performance of the lithiumion battery. Besides, the nitrogen-phosphorus co-doped carbon material is good in conductivity, a large number of three-dimensional spaces are generated by mutual stacking, the volume change in the process of battery reaction can be effectively alleviated, and the service life of the battery is improved; the preparation method is simple, cheap and efficient, batch production and commercial application of the bimetal phosphide material can be promoted, and therefore good practical application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and new energy, and specifically relates to a nitrogen-phosphorus co-doped carbon composite material modified by cobalt and molybdenum phosphide particles, a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the progress of the times and the development of the new energy automobile industry, modern society has higher and higher requirements for power lithium-ion batteries. Finding a new lithium-ion battery electrode material with high power and energy density, long cycle life, good stability, safety and reliability, and strong environmenta...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCH01M4/5805H01M4/625H01M4/628H01M10/0525B82Y30/00H01M2004/027H01M2004/021Y02E60/10
Inventor 王俊许浩然赵兰玲刘晓猛李德元夏青
Owner SHANDONG UNIV
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