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Preparation method and application of graphene @ metal phosphide @ carbon nano composite material

A nanocomposite material, metal phosphide technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of metal phosphide poor electrical conductivity, poor reaction reversibility, easy to expand, etc. Achieve the effect of improving the characteristics of lithium/sodium storage, low cost, and enhanced conductivity

Active Publication Date: 2017-10-20
江苏聚盈新材料科技有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of poor electrical conductivity, low electrical conductivity, poor reaction reversibility, easy agglomeration and easy volume expansion of existing metal phosphides, and provide a graphene@metal phosphide@C nanocomposite material The preparation method and application of

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  • Preparation method and application of graphene @ metal phosphide @ carbon nano composite material
  • Preparation method and application of graphene @ metal phosphide @ carbon nano composite material
  • Preparation method and application of graphene @ metal phosphide @ carbon nano composite material

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specific Embodiment approach 1

[0036] Specific implementation mode 1: This implementation mode is a preparation method of graphene@metal phosphide@C nanocomposite material, which is specifically completed according to the following steps:

[0037] 1. Preparation of metal oxide nanospheres:

[0038] Dissolve metal chloride salt and sodium acetate in ethylene glycol, and then ultrasonically disperse for 20-40 minutes to obtain a mixed solution; transfer the mixed solution to a hydrothermal reaction kettle, and then react at a temperature of 180°C-220°C for 6h- 10h, and then naturally cooled to room temperature to obtain the reaction product I; first, use distilled water to wash the reaction product I for 3 to 5 times, and then use absolute ethanol to wash the reaction product I for 3 to 5 times, and then at a temperature of 60°C to Dry at 80°C for 10h to 12h to obtain metal oxide nanospheres;

[0039] Metal chloride salt described in step 1 is FeCl 3 ·6H 2 O, CoCl 2 ·6H 2 O, NiCl 2 ·6H 2 O, SnCl4 ·5H ...

specific Embodiment approach 2

[0061] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the ultrasonic power in step 1 is 20W-40W. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0062] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the particle size of the metal oxide nanospheres described in Step 1 is 200nm-400nm. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

A preparation method and an application of a graphene @ metal phosphide @ carbon nano composite material. The invention relates to preparation methods and applications of a graphene composite material and aims to solve the problems that metal phosphides in the prior art are poor and low in electric conductivity, are poor in reaction reversibility, and are liable to agglomerate and expand. The preparation method includes the steps of: 1) preparing metal oxide nanospheres; 2) preparing metal oxide @ carbon nanospheres; 3) preparing metal phosphite @ carbon nanospheres; and 4) performing high-temperature carbonization to prepare the graphene @ metal phosphide @ carbon nano composite material. The composite material is used as an anode material in lithium ion batteries or sodium ion batteries. The specific capacity of a CR 2025 button lithium ion battery, which is produced with the nano composite material as an anode material, is still higher than 1000 mAh / g after cycle for three times under current density of 0.2 A / g; and after cycle for 100 times, the specific discharge capacity of the battery is still higher than 700 mAh / g.

Description

technical field [0001] The invention relates to a preparation method and application of a graphene composite material. Background technique [0002] Compared with commercial graphite anode materials (theoretical specific capacity 372mAh g -1 ), metal phosphides are considered as a class of potential new anode materials due to their high theoretical specific capacity and relatively low charge-discharge plateau. However, due to the inherent defects of metal phosphides, practically applicable metal phosphide lithium / sodium anode materials are still not available. For example, when pure FeP is used as the negative electrode material of sodium ion battery, when the current density is 0.2A / g, after 100 cycles, its specific capacity is only 100mAh g -1 , the main reasons are as follows: (1), metal phosphide has poor electrical conductivity, low ion or electronic conductivity, and poor reversibility of reaction; (2), in the process of repeated charge and discharge, the metal phosp...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583B82Y30/00
CPCB82Y30/00H01M4/362H01M4/5805H01M4/583Y02E60/10
Inventor 王惠王秀娟刘肖杰王刚白晋涛
Owner 江苏聚盈新材料科技有限公司
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