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

A technology of zinc ion battery and positive electrode material, applied in battery electrodes, nanotechnology for materials and surface science, positive electrode, etc. Battery system stability and other issues, to achieve the effect of increasing conductivity, less side reactions, and high specific capacity

Pending Publication Date: 2021-05-25
REHAB ENERGY INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For manganese oxide-based aqueous zinc-ion batteries, especially MnO 2 Materials, the main problem currently facing is the rapid attenuation of the cycle, the reasons are: (1) the dissolution of manganese ions during the charging and discharging process, which brings about the collapse of the original material morphology until the final loss of the main material; (2) high-valence manganese Ions are prone to disproportionation reactions during the reaction process, resulting in changes in the crystal structure; (3) MnO 2 It is an oxidizing agent with catalytic properties. It is prone to catalytic reaction in the aqueous electrolyte system, and oxygen is precipitated, which destroys the stability of the battery system; (4) Manganese oxide materials have poor conductivity

Method used

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

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preparation example Construction

[0042] According to the method for preparing the positive electrode material of the aqueous zinc ion battery according to the embodiment of the present invention, firstly, the manganese carbonate and the carbon source solution are mixed and dried to obtain the mixed dry powder, and then the above-mentioned MnO with good stability and high specific capacity can be obtained by sintering Aqueous zinc ion cathode material with / C structure. The preparation method has low raw material cost and simple preparation process, and can be used for large-scale industrial production, and the prepared aqueous zinc ion battery has good electrochemical performance, high specific capacity and good cycle performance. It should be noted that the features and advantages described above for the positive electrode material of the aqueous zinc ion battery are also applicable to the method for preparing the positive electrode material of the aqueous zinc ion battery, and will not be repeated here.

[...

Embodiment 1

[0046] 1. Preparation of MnO / C

[0047] (1) Mix manganese sulfate and sodium carbonate solutions of the same concentration at a molar ratio of 1:1, stir magnetically for 2 hours, wash 5 times with deionized water, and dry at 80°C to obtain MnCO 3 Precursor, the secondary particle size is about 5 μm;

[0048] (2) dissolving sucrose in a mixed solution containing ethanol and water at a volume ratio of 1:1, and configuring it as a 5wt% sucrose solution;

[0049] (3) MnCO 3 Stir and mix the precursor material and sucrose solution evenly, and put them in an oven at 80°C for drying;

[0050] (4) Put the material in step (3) in a tube furnace, calcined in a nitrogen atmosphere, and calcined at 600°C for 1 hour to obtain MnO / C, whose scanning electron microscope shows figure 2 As shown, the core particle size of MnO / C is 6 μm, the thickness of the cladding layer is 20 nm, and the molar ratio of MnO to carbon is 100:2.

[0051] 2. Preparation of MnO / C-Zn aqueous battery

[0052] ...

Embodiment 2

[0059] 1. Preparation of MnO / C

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

[0061] 2. The method for preparing the MnO / C-Zn aqueous battery is the same as that in Example 1.

[0062] 3. Electrical performance test

[0063] Electrical performance: The initial specific capacity is 162mAh / g. As the cycle progresses, the specific capacity continues to rise, and the capacity reaches the highest after 75 cycles, which is 192mAh / g.

[0064] Conclusion: The reduction of carbon source content leads to a thinner carbon-containing protective layer of MnO / C, therefore, the specific capacity decreases.

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Abstract

The invention discloses an aqueous zinc ion battery positive electrode material, a preparation method thereof and an aqueous zinc ion battery. The aqueous zinc ion battery positive electrode material comprises an inner core and a coating layer, wherein the inner core comprises MnO, the coating layer is formed on the outer surface of the inner core, and the coating layer comprises carbon. Therefore, the aqueous zinc ion positive electrode material is stable in structure and high in specific capacity, and an aqueous zinc ion battery prepared from the aqueous zinc ion positive electrode material is good in electrochemical performance, high in specific capacity and good in cycle performance.

Description

technical field [0001] The invention belongs to the field of water-based zinc-ion batteries, and in particular relates to a water-based zinc-ion battery cathode material, a preparation method thereof, and a water-based zinc-ion battery. Background technique [0002] Among the reported cathode materials for manganese-based aqueous zinc-ion batteries, most of them use different crystal forms of MnO 2 and MnO 2 Modified material or LiMn 2 o 4 as anode material. For manganese oxide-based aqueous zinc-ion batteries, especially MnO 2 Materials, the main problem currently facing is the rapid attenuation of the cycle, the reasons are: (1) the dissolution of manganese ions during the charging and discharging process, which brings about the collapse of the original material morphology until the final loss of the main material; (2) high-valence manganese Ions are prone to disproportionation reactions during the reaction process, resulting in changes in the crystal structure; (3) M...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/36C01B32/05C01B32/15C01G45/02B82Y30/00
CPCH01M4/366H01M4/50H01M4/625H01M4/628H01M10/36C01G45/02C01B32/05C01B32/15B82Y30/00C01P2004/80C01P2004/03C01P2002/72C01P2004/61C01P2004/62C01P2004/64C01P2006/40H01M2004/021H01M2004/028Y02E60/10
Inventor 倪珂帆于春雨傅洋陈璞
Owner REHAB ENERGY INC
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