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Preparation method and application of a graphene@metal phosphide@c nanocomposite 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: 2019-07-19
江苏聚盈新材料科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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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 a graphene@metal phosphide@c nanocomposite material
  • Preparation method and application of a graphene@metal phosphide@c nanocomposite material
  • Preparation method and application of a graphene@metal phosphide@c nanocomposite 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, then use absolute ethanol to wash the reaction product I for 3 to 5 times, and then wash the reaction product I 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 ...

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 application of graphene@metal phosphide@C nanocomposite material, which relates to a preparation method and application of graphene composite material. The purpose of the present invention is to solve the problems of existing metal phosphides with poor conductivity, low conductivity, poor reaction reversibility, easy agglomeration and easy volume expansion. Methods: 1. Preparation of metal oxide nanospheres; 2. Preparation of metal oxide@C nanospheres; 3. Preparation of metal phosphide@C nanospheres; 4. High-temperature carbonization to obtain graphene@metal phosphide@C nanocomposites. , which is used as anode material for lithium-ion batteries or sodium-ion batteries. The CR 2025 button-type lithium-ion battery prepared as anode material for lithium-ion batteries has been cycled three times at a current density of 0.2A / g, and the specific capacity is still higher than 1000mAhg. ‑1 , after 100 cycles, the discharge specific capacity is still higher than 700mAhg ‑1 .

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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Patent Type & Authority Patents(China)
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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