Graphene-based cobalt phosphide negative electrode material and preparation and application thereof

A technology of alkenyl cobalt phosphide and negative electrode materials, which can be applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve problems such as electrochemical defects, and achieve the effects of low cost, mild conditions, and simple process

Inactive Publication Date: 2020-08-11
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to defects such as the volume effect of graphene itself, it stil

Method used

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  • Graphene-based cobalt phosphide negative electrode material and preparation and application thereof
  • Graphene-based cobalt phosphide negative electrode material and preparation and application thereof
  • Graphene-based cobalt phosphide negative electrode material and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The first step, preparation of ZIF-67 material:

[0038] (1-1) First, add 0.49g of 2-methylimidazole into 50mL of methanol and stir evenly to obtain A solution; then add 0.68g of cobalt nitrate to 50mL of methanol and stir evenly to obtain B solution, then slowly add B solution into solution A, after stirring evenly, put the solution into a container, seal it with plastic wrap, and age for 48 hours;

[0039] (1-2) After 48 hours, the obtained solution was centrifugally washed with methanol for 3-5 times, and the rotating speed of each centrifugal cleaning was controlled at 7000-9000 rpm for 7-10 minutes. After cleaning, the obtained precipitate was put into a vacuum drying oven to remove water.

[0040] The second step, preparation of graphene-based cobalt phosphide negative electrode material:

[0041] (2-1) then the ZIF-67 that makes is added to graphene solution (the ZIF-67 of 12mg and the graphene of 6mg, the concentration of graphene is 3mg ml -1 ) and stir for a...

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PUM

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Abstract

The invention relates to a graphene-based cobalt phosphide negative electrode material and preparation and application thereof. Graphene oxide (GO) with a two-dimensional structure is adopted as a substrate material, the prepared ZIF-67 is compounded with graphene, the composite material is reduced, and then the obtained aerogel composite material is subjected to calcination phosphorization to obtain the graphene-coated cobalt phosphide composite material (RGB@CoP). Compared with the prior art, the graphene-based cobalt phosphide negative electrode material prepared by the preparation method disclosed by the invention shows excellent electrochemical performance when being used as a negative electrode of a lithium ion battery, and under the charge-discharge current of 100 mA.g<-1>, the capacity can reach 608m Ah.g<-1>, and the excellent rate performance efficiency of 390 mAh.g<-1> under 5 A.g<-1> is stabilized at 90% or above.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials, and relates to a graphene-based cobalt phosphide negative electrode material and its preparation and application. Background technique [0002] Rechargeable lithium-ion batteries (LIBs) are currently one of the most promising battery technologies for electrochemical energy storage due to their high energy density, low maintenance cost, and low self-discharge. Long cycle life, low cost, and high capacity are important parameters for secondary battery technology. However, in classic commercial lithium batteries, graphitic carbon is the most popular anode material, with a theoretical specific capacity of only 372 mA h g -1 , the development of new electrode materials with high energy density has become an important way to meet the growing demand for high performance. [0003] Due to its single-atom thickness, two-dimensional flexible structure, and excellent physicochemical pro...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/36H01M4/587H01M10/0525
CPCH01M4/362H01M4/5805H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 韩生马健孔玥黄燕山高丽常宾李原婷薛原
Owner SHANGHAI INST OF TECH
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