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Electrochemical insertion/deinsertion magnesium ion electrode with high capacity and stable circulation and preparation method

An ion electrode and electrochemical technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., to achieve the effects of enhanced electrochemical performance, mild reaction conditions, and strong mechanical properties

Inactive Publication Date: 2014-06-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the application of L-cysteine ​​to assist in the synthesis of graphene and MoS 2 There is no public report on the method of compounding nanomaterials and preparing electrodes for magnesium ion batteries

Method used

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  • Electrochemical insertion/deinsertion magnesium ion electrode with high capacity and stable circulation and preparation method
  • Electrochemical insertion/deinsertion magnesium ion electrode with high capacity and stable circulation and preparation method

Examples

Experimental program
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Embodiment 1

[0028] A preparation method of electrochemical intercalation / deintercalation magnesium ion electrode with high capacity and stable cycle: 1) Preparation of graphite oxide nanosheets: Disperse 1.25mmol (0.015g) graphite powder into 20mL concentrated sulfuric acid in an ice bath at 0℃ , Add 0.03g KMnO under stirring 4 , Added KMnO 4 The mass is 3 times that of graphite, stir for 30 minutes, the temperature rises to about 30 ℃, add 45ml deionized water, stir for 20 minutes, add 10ml of 30% H 2 O 2 , Stirring for 5 minutes, centrifugal separation, repeated washing with mass concentration 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0029] 2) Dissolve 1.25mmol (0.303g) of sodium molybdate in 63ml of deionized water to form a 0.02M solution, add 6.25mmol of L-cysteine ​​and stir evenly, the mixture of L-cysteine ​​and sodium molybdate The mass ratio is 5.0:1, and then the graphite oxide nanosheets prepared with 1.25mmol (0.015g) of graphite in step...

Embodiment 2

[0033] A preparation method of electrochemical intercalation / deintercalation magnesium ion electrode with high capacity and stable cycle: 1) Preparation of graphite oxide nanosheets: Disperse 2.5mmol (0.03g) graphite powder into 25mL concentrated sulfuric acid in an ice bath at 0℃ , Add KMnO under stirring 4 , Added KMnO 4 The mass is 4 times that of graphite, stir for 40 minutes, the temperature rises to about 33 ℃, add 50ml deionized water, stir for 25 minutes, add 12ml of 30% H 2 O 2 , Stirring for 5-10 minutes, centrifugal separation, repeated washing with mass concentration 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0034] 2) Dissolve 1.25mmol (0.303g) of sodium molybdate in 63ml of deionized water to form a 0.02M solution, add 7.5mmol of L-cysteine ​​and stir evenly, among which L-cysteine ​​and sodium molybdate The ratio of the amount of material is 6:1, and then the graphite oxide nanoplatelets prepared with 2.5mmol (0.03g) of graph...

Embodiment 3

[0038] A preparation method of electrochemical intercalation / deintercalation magnesium ion electrode with high capacity and stable cycle: 1) Preparation of graphite oxide nanosheets: Disperse 5.0mmol (0.06g) graphite powder into 25mL concentrated sulfuric acid in an ice bath at 0℃ , Add KMnO under stirring 4 , Added KMnO 4 The mass is 4 times that of graphite, stir for 50 minutes, the temperature rises to about 35 ℃, add 50ml deionized water, stir for 30 minutes, add 20ml of 30% H 2 O 2 , Stirring for 15 minutes, centrifugal separation, repeated washing with mass concentration 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0039] 2) Dissolve 1.25mmol (0.303g) of sodium molybdate in 63ml of deionized water to form a 0.02M solution, add 15mmol of L-cysteine ​​and stir evenly, the content of L-cysteine ​​and sodium molybdate The ratio is 12:1, and then the graphite oxide nanoplatelets prepared with 5.0mmol (0.06g) of graphite in step 1) are added ...

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Abstract

The invention discloses an electrochemical insertion / deinsertion magnesium ion electrode with high capacity and stable circulation and a preparation method. The active material of the electrode is a composite nano-material of graphene nano-sheets and MoS2, and the balance is acetylene black and polyvinylidene fluoride. The mass percentage of each component is: 75-85% of active material of composite nano-material, 5-10%of acetylene black and 10% of polyvinylidene fluoride, wherein the mass ratio of the graphene nano-sheets and the MoS2 nano-material in the active material of composite nano-material is 1 to 1-4 to 1. The preparation method of the electrode comprises the following steps of: using graphite as a raw material to prepare graphite oxide nano-sheets with a method of chemical oxidation; in the presence of the graphite oxide nano-sheets, compounding to obtain the composite nano-material of the graphene nano-sheets / MoS2 with a one-step hydrothermal in-situ reduction method; and finally using the composite nano-material of the graphene nano-sheets / MoS2 as the active material to prepare the electrode. The electrode has not only high electrochemical magnesium intercalating reversible capacity but also good stable circulation property and is widely applied to the new generation of magnesium ion batteries.

Description

[0001] The invention relates to an electrochemical intercalation and deintercalation magnesium ion electrode and a preparation method, in particular to use graphene nanosheets and MoS 2 The composite nano material is a high-capacity and stable cyclic electrochemical intercalation / deintercalation magnesium ion electrode prepared from electrochemical active materials, which belongs to the field of new chemical power sources and new energy materials. Background technique [0002] With the development of modern mobile communications and new energy vehicles, new chemical power sources have played an increasingly important role in modern society. Traditional secondary batteries, such as Ni-Cd batteries and lead-acid batteries, have been restricted and gradually eliminated because of their harmful metal elements Cd or Pb. Although the lithium-ion battery with the characteristics of high specific energy and environmental friendliness has been widely used in portable mobile appliances such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/122Y02E60/10
Inventor 陈涛陈卫祥常焜马琳
Owner ZHEJIANG UNIV
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