Application method of taking nano transition metal sulfide as positive electrode material of rechargeable magnesium battery

A transition metal, application method technology, applied in the direction of battery electrodes, active material electrodes, positive electrodes, etc., to achieve good electrochemical performance, no capacity decay effect

Active Publication Date: 2014-06-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Fe 3 S 4 The application in magnesium batteries has not been reported yet. Combined with its application in lithium-ion batteries and nickel-metal hydride batteries, it is not difficult to speculate that it will have good electrochemical performance in magnesium secondary batteries.

Method used

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  • Application method of taking nano transition metal sulfide as positive electrode material of rechargeable magnesium battery
  • Application method of taking nano transition metal sulfide as positive electrode material of rechargeable magnesium battery
  • Application method of taking nano transition metal sulfide as positive electrode material of rechargeable magnesium battery

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Embodiment 1

[0032] Embodiment 1: Nano Fe 3 S 4 Application in Rechargeable Magnesium Batteries

[0033] 1. Using Fe(SO 4 ) 2 ·6H 2 O and L-cysteine ​​(C 3 h 7 NO 2 S) as the raw material, weighed according to the atomic molar ratio of Fe:S=1:4, and dissolved in 40ml deionized water respectively, after fully dissolving, mixed the two solutions and stirred for 30min to obtain Fe ion concentration of 0.05M light yellow transparent solution 80ml. The above 80ml solution was added into a high-pressure reactor with a polytetrafluoroethylene liner having an effective volume of 100ml, and the reactor was sealed. Transfer the sealed reactor to an oven, slowly raise the temperature to 160°C, keep it warm for 12 hours, and then cool with the furnace. Open the cooled reaction kettle, take out the lining, pour out the supernatant, wash the obtained gray-black solid several times with deionized water and absolute alcohol, and dry it in vacuum at 80°C to obtain nano-Fe 3 S 4 .

[0034] 2. Nano...

Embodiment 2

[0038] Embodiment 2: Nano NiFe 2 S 4 Application in Rechargeable Magnesium Batteries

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Abstract

The invention discloses an application method of taking nano transition metal sulfide as a positive electrode material of a rechargeable magnesium battery. The application method comprises the following steps: synthesizing a transition metal salt and a sulfur source compound to form a nano transition metal sulfide by a hydrothermal method under reaction conditions that the temperature is 160-220 DEG C and the heat is kept for 12-24 hours; by taking the nano transition metal sulfide as an active substance, adding a conductive agent and a binding agent to prepare a positive plate containing the nano transition metal sulfide; and by taking the positive plate as a positive electrode and pure magnesium metal as a negative electrode, preparing the rechargeable magnesium battery. The nano transition metal sulfide material is used as the active substance of the rechargeable magnesium battery and reversible embedding of divalent magnesium ions can be carried out, so that the rechargeable magnesium battery prepared by the method has a stable charging/discharging platform and the specific discharge capacity is higher than 400mAh/g under the current density of 20mA/g; the rechargeable magnesium battery has no capacity fading after being circulated for 70 times.

Description

technical field [0001] The invention relates to an application method of nanometer materials in batteries, in particular to an application method of nanometer transition metal sulfides as anode materials for rechargeable magnesium batteries. Background technique [0002] With the limitation of conventional energy sources and the increasingly prominent environmental problems, new energy sources characterized by environmental protection and renewable energy have attracted more and more attention from various countries. Only major breakthroughs in materials can bring new developments to current energy storage and conversion devices. The development of rechargeable magnesium batteries is due to the thermodynamic properties of metal magnesium. Compared with lithium, although the electrode potential of magnesium is slightly lower (lithium is -3.03V, magnesium is -2.37V (acidic), -2.69V (alkaline)) , but can provide a higher volume specific capacity (magnesium 3832mAh cm -3 , lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397H01M4/136
CPCY02E60/122H01M4/136H01M4/1397H01M4/5815H01M10/054H01M2004/028Y02E60/10
Inventor 吴晓梅张若然张赟吴丹妮曾小勤丁文江
Owner SHANGHAI JIAO TONG UNIV
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