Method for preparing anode of magnesium ion battery

Abstract

The invention discloses a method for preparing an anode of a magnesium ion battery, and the method comprises the following steps: uniformly mixing and stirring conductive ink (mass percent: 73.5-80.9%), manganese salt (mass percent: 2.3-3.2%) and magnesium powder (mass percent: 15.9-24.2%) so as to obtain a raw material mixture; and filling the raw material mixture into a reaction kettle, and then heating the raw material mixture in one of the following two modes: a) heating the raw material mixture to 100-200 DEG C and then carrying out heat preservation for 1-3 hours under a pressure condition of no less than three barometric pressures, then under the same pressure condition, rapidly raising the temperature to 300-400 DEG C and then carrying out heat preservation for 10-30 minutes, or b) rapidly raising the temperature to 200-300 DEG C under a vacuum condition and then carrying out heat preservation for 10-20 minutes; and then, rapidly cooling and drying the obtained raw material mixture so as to obtain an anode material for the magnesium ion battery. The anode material for the magnesium ion battery prepared by using the method disclosed by the invention is large in specific capacity (160 MAh / g), high in operating voltage (2.2 V), and excellent in cycle performance (after a deep drawing-discharge cycle is performed 50 times, more than 95% of capacity still can be maintained).

Description

technical field [0001] The invention belongs to the technical field of battery electrode preparation, and relates to a method for preparing secondary battery electrodes, in particular to a method for preparing battery electrodes using high-temperature synthetic new materials. Background technique [0002] Magnesium is in the lower right corner of lithium on the periodic table, and is closest in nature to lithium. Lithium-ion secondary batteries have been widely used in mobile power sources that require small capacity, but in the case of large-capacity power sources, lithium-ion batteries have poor safety, high cost, and low resource reserves. Magnesium is relatively stable in nature and low in cost. Most magnesium compounds are non-toxic or low-toxic, and magnesium resources are abundant. Therefore, Mg-ion battery has gradually been paid attention to as a potential high-load battery. [0003] Compared with lithium-ion batteries, magnesium, as an electrode material, has a l...

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Problems solved by technology

[0003] Compared with lithium-ion batteries, magnesium, as an electrode material, has a larger theoretical specific capacity (2205mAh / g), and can provide much higher energy density than lead-acid batteries, nickel-cadmium batteries, etc., and is considered more suitable for applications that require higher power. Green batteries such as electric vehicles, but due to the high charge density and strong polarization of magnesium ions, they are often embedded in positive electrode materials in the form of solvation. Therefore, it is much more difficult than lithium ion intercalation materials; in addition, magnesium will form in most electrolytes. The passivation film prevents magnesium ions from passing through, so that they cannot be deposited and dissolved smoothly. Magnesium-ion batteries mainly address the two problems of the positive electrode insertable material and the electrolyte.

[0004] At present, the research on magnesium ion cathode materials mainly refers to the doping of some cathode materials of lithium ions, such as transition metal oxides, sulfides, etc., and they are all very thin layers of active materials that need to be attached to other auxiliary materials. On the electrode plate; for the electrolyte, it is mainly the ether solution of the liquid organomagnesium-aluminum complex, polymer electrolytes and ionic liquids have also been studied, but there is still no suitable positive electrode intercalation material and non-aqueous electrolyte, so its development has been hindered

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