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

An ionic electrode and electrochemical technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., to achieve high electrical and thermal conductivity, enhanced electrochemical performance, and strong mechanical properties

Inactive Publication Date: 2011-08-03
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
  • Electrochemical insertion/deinsertion magnesium ion electrode with high capacity and stable circulation and preparation method

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Embodiment 1

[0028] A preparation method of an electrochemical intercalation and extraction magnesium ion electrode with high capacity and stable cycle: 1) Preparation of graphite oxide nanosheets: disperse 1.25mmol (0.015g) of graphite powder into 20mL of concentrated sulfuric acid in an ice bath at 0°C , add 0.03g KMnO with stirring 4 , the added KMnO 4 The mass of graphite is 3 times that of graphite, stir for 30 minutes, the temperature rises to about 30°C, add 45ml of deionized water, stir for 20 minutes, add 10ml of 30% H 2 o 2 , stirred for 5 minutes, centrifuged, and repeatedly washed with a mass concentration of 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0029] 2) Dissolve 1.25mmol (0.303g) 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 ratio of mass is 5.0: 1, then the 1st) step is added in this solution with the pre...

Embodiment 2

[0033] A preparation method of electrochemical intercalation and extraction magnesium ion electrode with high capacity and stable cycle: 1) Preparation of graphite oxide nanosheets: disperse 2.5mmol (0.03g) of graphite powder into 25mL of concentrated sulfuric acid in an ice bath at 0°C , add KMnO with stirring 4 , the added KMnO 4 The mass of graphite is 4 times that of graphite, stir for 40 minutes, the temperature rises to about 33 ° C, add 50ml of deionized water, stir for 25 minutes, add 12ml of H2O with a mass concentration of 30% 2 o 2 , stirred for 5-10 minutes, centrifuged, and repeatedly washed with a mass concentration of 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, wherein the amount of L-cysteine ​​and sodium molybdate The ratio of the amount of substance is 6: 1, then t...

Embodiment 3

[0038]A preparation method for electrochemical intercalation and extraction of magnesium ion electrodes with high capacity and stable cycle: 1) Preparation of graphite oxide nanosheets: disperse 5.0 mmol (0.06 g) of graphite powder into 25 mL of concentrated sulfuric acid in an ice bath at 0 °C , add KMnO with stirring 4 , the added KMnO 4 The mass of graphite is 4 times that of graphite, stir for 50 minutes, the temperature rises to about 35°C, add 50ml of deionized water, stir for 30 minutes, add 20ml of H2O with a mass concentration of 30% 2 o 2 , stirred for 15 minutes, centrifuged, and repeatedly washed with a mass concentration of 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0039] 2) Dissolve 1.25mmol (0.303g) sodium molybdate in 63ml deionized water to form a 0.02M solution, add 15mmol of L-cysteine ​​and stir evenly, the amount of L-cysteine ​​and sodium molybdate The ratio is 12: 1, then the 1st) step adds in this solution th...

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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 extraction magnesium ion electrode and a preparation method, especially the use of graphene nanosheets and MoS 2 The composite nanomaterial is used as an electrochemical active substance to prepare an electrochemical intercalation and extraction magnesium ion electrode with high capacity and stable cycle, which belongs to the field of new chemical power source and new energy material. Background technique [0002] With the development of modern mobile communications and new energy vehicles, new chemical power sources play an increasingly important role in modern society. The application of traditional secondary batteries, such as Ni-Cd batteries and lead-acid batteries, is limited and phased out due to the harmful metal elements Cd or Pb contained in them. Although lithium-ion batteries with the characteristics of high specific energy and environmental friendliness have been widely used in portable mobile app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 陈涛陈卫祥常焜马琳
Owner ZHEJIANG UNIV
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