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A rice grain-like porous micro-nano structure znmn 2 o 4 Lithium-ion battery anode material

A lithium-ion battery, micro-nano structure technology, applied in the direction of battery electrodes, negative electrodes, structural parts, etc., can solve the problems of low reversible capacity for high-current charge and discharge, complex preparation process, short cycle life, etc., and achieve product shape and size Controllable, simple preparation process and low cost

Active Publication Date: 2020-03-06
HUAIBEI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve existing ZnMn 2 o 4 The negative electrode material has low reversible capacity for high-current charge and discharge, short cycle life, and technical defects such as complex preparation process, long time-consuming, poor repeatability, and high cost. It provides a rice-like porous micro-nano structure ZnMn 2 o 4 Lithium-ion battery negative electrode material, and its preparation method is provided

Method used

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  • A rice grain-like porous micro-nano structure znmn <sub>2</sub> o <sub>4</sub> Lithium-ion battery anode material
  • A rice grain-like porous micro-nano structure znmn <sub>2</sub> o <sub>4</sub> Lithium-ion battery anode material
  • A rice grain-like porous micro-nano structure znmn <sub>2</sub> o <sub>4</sub> Lithium-ion battery anode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 0.5mmol of zinc acetate dihydrate, 1mmol of manganese acetate tetrahydrate and 30mmol of ammonium bicarbonate to 40ml of triethanolamine in sequence, and stir to form a clear solution. Then the solution was transferred to a reaction kettle with a polytetrafluoroethylene liner, and reacted at a constant temperature of 180° C. for 10 h. After the completely reacted solution was cooled and precipitated, it was filtered, washed three times with deionized water and absolute ethanol respectively, and dried at 80° C. in a blast drying oven to obtain a white solid precursor powder. The obtained precursor powder was put into a tube furnace, the temperature was raised at a rate of 3°C / min, and heat-treated at 600°C in air for 5h to obtain a brown-yellow product.

[0031] figure 1 For the ZnMn that embodiment 1 obtains 2 o 4 The XRD pattern of the product. It can be seen from the figure that the prepared product has ZnMn 2 o 4 Spinel phase structure.

[0032] figure 2...

Embodiment 2

[0037] Add 0.25mmol of zinc acetate dihydrate, 0.5mmol of manganese acetate tetrahydrate and 20mmol of ammonium bicarbonate to 40ml of triethanolamine in sequence, and stir to form a clear solution. Then the solution was transferred to a reaction kettle with a polytetrafluoroethylene liner, and reacted at a constant temperature of 180°C for 0.5h. After the completely reacted solution was cooled and precipitated, it was filtered, washed three times with deionized water and absolute ethanol respectively, and dried at 80° C. in a blast drying oven to obtain a white solid precursor powder. Put the obtained precursor powder into a tube furnace, heat up at a rate of 3°C / min, and heat-treat at 700°C in air for 3h to obtain a brown-yellow product.

[0038] Figure 6 For the ZnMn that embodiment 2 obtains 2 o 4 Scanning electron microscope image of the product precursor. It can be seen from the figure that the solvothermal reaction time is as short as 0.5h, and the precursor micro-...

Embodiment 3

[0040] Add 1mmol of zinc acetate dihydrate, 2mmol of manganese acetate tetrahydrate and 30mmol of ammonium bicarbonate to 40ml of triethanolamine in sequence, and stir to form a clear solution. Then the solution was transferred to a reaction kettle with a polytetrafluoroethylene liner, and reacted at a constant temperature of 160° C. for 1 h. After the completely reacted solution was cooled and precipitated, it was filtered, washed three times with deionized water and absolute ethanol respectively, and dried at 80° C. in a blast drying oven to obtain a white solid precursor powder. The obtained precursor powder was put into a tube furnace, the temperature was raised at a rate of 2°C / min, and heat-treated at 500°C in air for 3 hours to obtain a brown-yellow product.

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Abstract

The invention discloses a ZnMn2O4 lithium-ion battery anode material with a rice-granule-shaped porous micro-nano structure. According to the invention, monodispersed porous rice-granule-shaped microparticles are assembled by nanoparticles, wherein the nanoparticles have a particle size of 50 to 80 nm, and the microparticles have a particle length of 1.1 to 1.3 [mu]m and a particle width of 0.6 to0.8 [mu]m; and porous microparticles form a complete three-dimensional micro-nano structure through continuous connection of naturally-grown nanoparticles, and a preparation method is disclosed. Theporous micro-nano structure formed by continuous connection of nanoparticles with unique and proper sizes provided by the invention has high structural stability in the processes of electrode preparation, charging and discharging when used as a lithium-ion battery anode material, and shows excellent large-current charging and discharging performances and circulating stability; the preparation process is simple, has short reaction time and does not need the use of a surfactant; a reaction solvent has low cost and can be recycled; and a product is controllable in morphology and size, has good repeatability and is applicable to industrial production.

Description

technical field [0001] The invention relates to a negative electrode material for a lithium ion battery, in particular to a rice grain-shaped porous micro-nano structure ZnMn 2 o 4 Lithium-ion battery anode material. Background technique [0002] Transition metal oxides are an important class of inorganic functional substances, which are widely used in many fields such as materials, sensors, and catalysts. As anode materials for lithium-ion batteries, they can achieve reversible reactions with lithium during battery charge-discharge cycles. , has the advantages of large discharge capacity. Among them, manganese-based metal oxides, such as MnO, MnO 2 and Mn 2 o 3 etc., because of its rich natural resources, non-toxic environmental protection and other characteristics, it has attracted much attention. However, the volume of manganese-based oxides changes greatly during charge and discharge, and they are easy to pulverize, resulting in poor cycle reversibility. ZnMn 2 o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/12H01M4/50H01M10/0525B82Y30/00
CPCB82Y30/00C01G45/1235C01P2002/72C01P2004/03C01P2004/04C01P2004/61C01P2004/64C01P2006/40H01M4/50H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 王飞陈盛汪燕鸣张永兴徐晓宁么梦雅
Owner HUAIBEI NORMAL UNIVERSITY
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