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High-performance rechargeable magnesium battery and manufacturing method thereof

A high-performance, magnesium battery technology, used in battery electrodes, secondary batteries, sustainable manufacturing/processing, etc., can solve problems such as poor cycle performance and deactivation, and achieve high operating voltage, large specific capacity, and cycle performance. Good results

Active Publication Date: 2011-04-20
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During battery cycling, these passivation films will gradually deactivate conventional bulk magnesium electrodes, resulting in poor cycle performance (Z. Lu, A. Schechter, M. Moshkovich, D. Aurbach, On the electrochemical behavior of Magnesium electrodes in polar aprotic electrolyte solutions, Journal of Electroanalytical Chemistry, 1999, 466: 203)

Method used

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  • High-performance rechargeable magnesium battery and manufacturing method thereof
  • High-performance rechargeable magnesium battery and manufacturing method thereof
  • High-performance rechargeable magnesium battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Fabrication of Molybdenum Disulfide Cathode

[0036] Add 0.25 mmol of molybdenum trioxide, 1 mmol of thioacetamide and 12 mL of pyridine to the hydrothermal kettle in sequence. After mixing evenly, the hydrothermal kettle was sealed and kept at 150° C. for 16 hours, then naturally cooled to room temperature. After centrifugation, the gray-black product obtained was washed several times with absolute ethanol and distilled water, and finally dried in vacuum at 60 °C for 4 hours. The X-ray diffraction pattern shows that the diffraction peak signal corresponding to the 002 crystal plane of the prepared nano-molybdenum disulfide is very weak, indicating that it has a highly exfoliated structure ( figure 1 ). The Raman spectrum shows that the prepared nano molybdenum disulfide is at 1400 cm -1 Nearby corresponds to E 1 2g and A 1g The vibrational peaks of the soften and broaden, indicating that the average number of layers is not more than 4 layers ( figure 2 ).

[0...

Embodiment 2

[0044] The making of the molybdenum disulfide positive electrode sheet is the same as in Example 1. The fabrication of the magnesium negative electrode is similar to that of Example 1, but the bulk magnesium is used instead of nano-magnesium, and the mass of the bulk magnesium on the electrode sheet is 3.0 mg. The assembly and testing of the simulated battery are the same as in Example 1. Image 6 It is the first constant current charge and discharge curve of the battery, the discharge platform is around 1.8 V, and the discharge capacity is 85 mAh g -1 , the first Coulombic efficiency is 0.98. The discharge capacity of the battery decays slowly in the first 15 weeks, and then accelerates the decay.

Embodiment 3

[0046] The fabrication of the molybdenum disulfide positive electrode sheet was similar to that in Example 1, but the highly exfoliated nano-molybdenum disulfide was replaced by bulk molybdenum disulfide, and the mass of the bulk molybdenum disulfide on the electrode sheet was 3.0 mg. The making of magnesium negative electrode is the same as embodiment 1. The assembly and testing of the simulated battery are the same as in Example 1. Figure 7 It is the first constant current charge and discharge curve of the battery, the discharge platform is around 1.8 V, and the discharge capacity is 71 mAh g -1 , the first Coulombic efficiency is 0.94.

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Abstract

The invention discloses a high-performance rechargeable magnesium battery consisting of a positive plate, a negative plate, a diaphragm and an electrolyte. The positive plate is made from highly stripped nano-supramoly which is of highly erosive structure, wherein the average number of the layers of the nano-supramoly is not more than 4, and the average thickness is not more than 3nm. The negative plate is made from grain-shaped nanometer-level magnesium or nanometer-micrometer level composite magnesium, and the average grain diameter is 1-10nm. The diaphragm is a three-layer film made from polythene, polypropylene and polyethylene. The electrolyte is made from a tetrahydrofuran solution of Grignard reagent derivate. The invention has the advantages that: the rechargeable battery has gentler material preparation conditions (from the room temperature to 150 DEG C), larger specific capacity (170mAhg<-1>), higher operating voltage (1.8V), better circulation performance (still keeping 95%of initial capacity after circulating for 50 periods) and the like compared with the reported magnesium secondary battery system, and the rechargeable battery can be applied to the next generation large-scale energy storage batteries.

Description

technical field [0001] The present invention relates to the preparation technology of magnesium secondary battery, especially a kind of high-performance rechargeable magnesium battery and its manufacturing method. A magnesium secondary battery with metallic magnesium as the negative electrode. Background technique [0002] Due to the unsustainability of fossil energy and the urgent need for large-scale energy storage in modern society, people's efforts to find better and cheaper batteries have never stopped. Although the battery materials used in traditional lead-acid batteries are cheap and easy to obtain, they are heavy and highly toxic. Nickel-based batteries that followed contained toxic cadmium elements or rare rare earth elements. Even expensive lithium batteries have the problem of being unstable to air. Magnesium is an environmentally friendly light metal element that is very abundant in the earth. The theoretical specific capacity of the rechargeable magnesium b...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M10/38H01M4/136H01M4/134H01M4/1397H01M4/62
CPCY02E60/122Y02E60/12Y02E60/10Y02P70/50
Inventor 陈军梁衍亮陶占良冯茹君马华梁静
Owner NANKAI UNIV
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