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Manufacture method of ferrosilite magnesium, and application in rechargeable magnesium cell anode material

An iron silicate, magnesium battery technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of unsatisfactory positive electrode and poor oxidation stability of rechargeable magnesium batteries, and achieve improved electrochemical activity, Lower synthesis cost and smaller particle size

Inactive Publication Date: 2012-03-21
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sulfide itself has some disadvantages: the oxidation stability is not very good and the preparation of the material requires anaerobic conditions, etc.
Vanadium oxides can also intercalate Mg 2+ , but the presence of water is required, and the positive electrode for rechargeable magnesium batteries is not ideal

Method used

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  • Manufacture method of ferrosilite magnesium, and application in rechargeable magnesium cell anode material
  • Manufacture method of ferrosilite magnesium, and application in rechargeable magnesium cell anode material
  • Manufacture method of ferrosilite magnesium, and application in rechargeable magnesium cell anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 0.6g of KCl, 0.0968g of MgO, 0.4354g of FeC 2 o 4 2H 2 O and 0.1452g of SiO 2 After grinding for 30 minutes until uniform, vacuum-dry at 100°C for 12 hours, then heat-treat at 350°C for 2 hours under the protective atmosphere of argon, then heat-treat at 900°C for 6 hours, and finally cool naturally to room temperature to obtain silicic acid iron magnesium.

[0024] The magnesium iron silicate prepared above was subjected to a powder X-ray diffraction experiment on a Rigaku D / MAX2200PC X-ray diffractometer produced by Shimadzu Corporation of Japan. The experimental conditions are as follows: copper target, X-ray wavelength 0.15406 nm, Ni filter; the light tube voltage used is 40kV, the current is 20mA, the scanning range is 15-75°, and the scanning speed is 4° min -1 .

[0025] Metal element detection was carried out on the Iris Advantage 1000 Inductively Coupled Plasma Optical Emission Spectrometer produced by the thermoelectric company produced above, and the res...

Embodiment 2

[0029] 0.6g of KCl, 0.0968g of MgO, 0.4354g of FeC 2 o 4 2H 2 O and 0.1452g of SiO 2 After grinding for 30 minutes until uniform, vacuum-dry at 100°C for 12 hours, then heat-treat at 350°C for 2 hours under a protective atmosphere of argon, then heat-treat at 1000°C for 6 hours, and finally cool naturally to room temperature to obtain silicic acid iron magnesium.

[0030] Metal element detection was carried out on the Iris Advantage 1000 Inductively Coupled Plasma Optical Emission Spectrometer produced by the thermoelectric company produced above, and the results showed that the molar ratio of Mg and Fe was 1:1.

[0031] The magnesium iron silicate prepared above was subjected to a powder X-ray diffraction experiment on a Rigaku D / MAX2200PC X-ray diffractometer produced by Shimadzu Corporation of Japan. The experimental conditions are as follows: copper target, X-ray wavelength 0.15406 nm, Ni filter; the light tube voltage used is 40kV, the current is 20mA, the scanning ra...

Embodiment 3

[0034] 0.6g of KCl, 0.0968g of MgO, 0.2878g of FeC 2 o 4 2H 2 O and 0.1202g of SiO 2 After grinding for 30 minutes until uniform, vacuum-dry at 100°C for 12 hours, then heat-treat at 350°C for 2 hours under a protective atmosphere of argon, then heat-treat at 1000°C for 6 hours, and finally cool naturally to room temperature to obtain silicic acid iron magnesium.

[0035] The magnesium iron silicate prepared above was subjected to a powder X-ray diffraction experiment on a Rigaku D / MAX2200PC X-ray diffractometer produced by Shimadzu Corporation of Japan. The experimental conditions are as follows: copper target, X-ray wavelength 0.15406 nm, Ni filter; the light tube voltage used is 40kV, the current is 20mA, the scanning range is 15-75°, and the scanning speed is 4° min -1 .

[0036] Metal element detection was carried out on the Iris Advantage 1000 inductively coupled plasma emission spectrometer produced by the thermoelectric company of the United States for the iron ma...

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Abstract

The invention discloses a method for preparing magnesium ferrosilite and use in a rechargeable magnesium cell anode material. The magnesium ferrosilite takes nano silicon dioxide as a silicon source and is made by a molten salt method. The magnesium ferrosilite can be used as the rechargeable magnesium cell anode material and show good electrochemical charge-discharge behaviour. The discharge volume can reach 151.7mAh / g when the discharge platform reaches 1.5V(vs.Mg / Mg<2+>) in a 0.25mol.L<-1>Mg(AlCl2BuEt)2 / THF electrolyte and under a 0.2C discharging speed. The discharge volume can reach 148.5mAh / g when the discharge platform reaches 1.2V(vs.Mg / Mg<2+>) in a 0.4mol.L<-1>[Mg2Cl3]<+>[AlPh2Cl2]<-> / THF electrolyte and under a 0.4C discharging speed.

Description

technical field [0001] The invention relates to a preparation method of an inorganic material and its application in a battery positive electrode material, in particular to a preparation method of iron magnesium silicate and its application in a rechargeable magnesium battery positive electrode material. Background technique [0002] The application of storage batteries in modern society is becoming more and more important and widespread, as can be seen from the extensive application of lithium-ion batteries that have been commercialized in recent years. With the aggravation of environmental pollution and the increasingly serious energy crisis, the popularization of electric vehicles is urgently needed. The rechargeable batteries currently in use are mainly Ni-Cd, lead-acid, Ni-MH and lithium-ion batteries. None of them are clearly ideal or feasible for application in electric vehicles. The obvious disadvantage of the first two batteries is that they contain harmful elemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/20H01M4/58
CPCY02E60/12Y02E60/10
Inventor 李云努丽燕娜杨军王久林徐欣欣
Owner SHANGHAI JIAOTONG UNIV
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