Aqueous zinc ion battery positive electrode material, preparation method thereof and aqueous zinc ion battery

[0042]According to the method of preparing a hydratroid ion battery positive material according to an embodiment of the present invention, the manganese carbonate and carbon source solution are first mixed and dried to give a mixed dry powder, and then the above-mentioned MnO having a good capacity is high by sintering. The water-based zinc ion positive electrode material for / C structure. The preparation method is low, and the preparation process is simple. It can carry out large-scale industrial production, and the electrochemical properties of the obtained water-based zinc ion battery are good, the specific capacity is high, and the cycle performance is good. It should be noted that the characteristics and advantages described in the positive electrode material of the water-based zinc-based battery are also suitable for the method of preparing a zinc-ion battery positive electrode material, and details are not described herein again.

[0043]In a third aspect of the invention, the p

[0045]Example 1

[0046]1, prepare MnO / C

[0047](1) The same concentration of manganese sulfate and sodium carbonate is mixed with 1: 1, and the magnetic force is stirred for 2 h, washed 5 times with deionized water, dried at 80 ° C to give MNCO.3The precursor, the secondary particle size is about 5 μm;

[0048](2) The sucrose is dissolved in a mixed solution containing ethanol and water, and a sucrose solution having a concentration of 5 wt% is configured;

[0049](3) Put Mnco3The precursor material and the sucrose solution were mixed mixed and mixed, and dried in an oven at 80 ° C;

[0050](4) Place the material in step (3) in the tube furnace, calcined under a nitrogen atmosphere, calcined at 600 ° C for 1 h, resulting in MnO / C, and its scanning electron microscopefigure 2 As shown, the core particle diameter of MnO / C is 6 μm, the thickness of the coating layer is 20 nm, and the molar ratio of MnO and carbon is 100: 2.

[0051]2, prepare a MnO / C-Zn water battery

[0052](1) The MnO /

[0058]Example 2

[0059]1, prepare MnO / C

[0060]The concentration of the sucrose solution was replaced from 5 wt% to 1% by weight, and the calcination temperature was changed from 600 ° C to 650 ° C, and the core particle diameter obtained by 6.5 μm of the MnO / C obtained by the same embodiment, and the thickness of the coating layer was 2 nm. And the molar ratio of MnO and carbon is 100: 0.45.

[0061]2, the method of preparing a MnO / C-Zn water battery with Example 1 is in Example 1.

[0062]3, electrical performance test

[0063]Electrical performance: The initial compared capacity is 162mAh / g, with the loop, the capacity is up to the highest, and the capacity is up to 192 mAh / g.

[0064]Conclusion: The carbon source is lowered, resulting in thin-containing carbon-containing protective layers of MnO / C, and therefore, the specific capacity is reduced.