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Preparation method of magnesium ion battery negative electrode material

A technology of magnesium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., to achieve the effects of enriching negative electrode material types, good electrochemical reaction reversibility and charge-discharge performance, and high reaction temperature

Inactive Publication Date: 2021-03-09
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

[0004] Low-valence transition metal compounds are an important class of high-energy anode materials, and their applications as magnesium-ion batteries have rarely been reported.

Method used

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  • Preparation method of magnesium ion battery negative electrode material
  • Preparation method of magnesium ion battery negative electrode material
  • Preparation method of magnesium ion battery negative electrode material

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Embodiment

[0020] Weigh commercially available analytically pure manganese acetate tetrahydrate (Mn(C 2 h 3 o 2 ) 2 4H 2 O, content ≥ 99.0%) 2.45g and thiourea (H 2 NCSNH 2 , content ≥ 99.0%) 0.91g, dispersed in 25mL of analytically pure glycerol (C 3 h 8 o 3 , content ≥ 99.0%), stirred and heated slowly, and stirred at a constant temperature for 30 minutes after the temperature rose to 80°C to obtain a uniform dispersion, which was transferred to a three-necked flask, heated to 170°C, kept for 4 hours, and then cooled to room temperature naturally , remove the supernatant, wash with absolute ethanol and deionized water several times, and centrifuge until the supernatant is clear, then dry the precipitate in a vacuum oven at 60°C for 8 hours to obtain a manganese sulfide sample. For the X-ray diffraction pattern of manganese sulfide samples see figure 1 , mainly wurtzite-type manganese sulfide; its scanning electron micrograph can be found in figure 1 , which is a spherical par...

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Abstract

The invention discloses a preparation method of a magnesium ion battery negative electrode material. Glycerol is used as a dispersing agent, thiourea and manganese acetate react at a certain molar ratio, temperature and time, and manganese sulfide with a wurtzite structure is obtained; and then an electrode is manufactured, and a button type magnesium ion half cell is assembled. The electrochemical test result shows that the manganese sulfide negative electrode material has relatively good electrochemical reaction reversibility, the equilibrium voltage of the manganese sulfide negative electrode material is about 0.77V (vs.Mg / Mg<2+>), the first specific discharge capacity can reach 155.75 mAh.g<-1>, and the first Coulombic efficiency reaches 93.0%. Therefore, the manganese sulfide has a good development prospect when being used as the negative electrode material of the magnesium ion battery.

Description

technical field [0001] The invention belongs to the technical field of magnesium ion batteries, and in particular relates to a preparation method of an electrode material and its electrochemical performance for storing magnesium. Background technique [0002] Magnesium metal is rich in resource reserves, has a large volume specific energy, and most of its compounds are low-toxic or non-toxic, environmentally friendly, high in safety, and low in cost. Therefore, magnesium-ion batteries are very promising secondary batteries. [0003] In recent years, magnesium-ion batteries have been extensively studied in terms of electrolytes and cathode materials. However, there are relatively few research reports on anode materials for magnesium-ion batteries, mainly including magnesium metals, transition metals and their alloys, lithium titanate, and titanium dioxide. Metal and alloy anode materials have serious volume expansion during charging and discharging, which leads to poor cycl...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/054C01G45/00
CPCH01M4/5815H01M10/054C01G45/00C01P2002/72C01P2004/03C01P2006/40C01P2004/32C01P2004/62C01P2004/61Y02E60/10
Inventor 杨建文仝蒙恩熊伟雄刘鑫鑫
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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