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Preparation method of carbon-coated manganese tetraoxide polyhedron negative electrode material for lithium ion battery

A technology of carbon-coated manganese tetroxide and lithium ion batteries, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced electrode cycle life, reduced electrochemical performance, large irreversible capacity, etc., to avoid capacity decay The effect of too fast, improving structural stability, and improving electrochemical performance

Active Publication Date: 2020-07-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon-coated four manganese oxides prepared in the literature have the following disadvantages: the irreversible capacity of the material is large, and the discharge retention capacity after cycling is low (that is, the cycle performance is not good)
This is because the volume of the material expands and shrinks during the charge-discharge cycle, which causes the grains to break and the structure to collapse, leading to the destruction of the electrode and reducing the cycle life of the electrode. ”, leading to an increase in the initial irreversible capacity and a decrease in electrochemical performance

Method used

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  • Preparation method of carbon-coated manganese tetraoxide polyhedron negative electrode material for lithium ion battery
  • Preparation method of carbon-coated manganese tetraoxide polyhedron negative electrode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) According to m 甲酰胺 :m 高锰酸钾 =48, fully stirring and dissolving potassium permanganate in formamide;

[0034] (2) According to m 水 :m 聚乙二醇 =15.8, polyethylene glycol 20000 was dissolved in deionized water to obtain a uniform mixed solution;

[0035] (3) According to m 步骤(2) :m 步骤(1) =1.38, the mixed solution obtained in step (2) was added to the mixed solution in step (1), and stirred at 80° C. for 15 min;

[0036] (4) Put the sol obtained in step (3) into a hydrothermal kettle, and react at 100° C. for 14 hours;

[0037] (5) After cooling to room temperature, the solid in the product obtained in step (4) was washed several times with deionized water and ethanol, and the washed product was placed in a vacuum oven at 50-60°C to dry;

[0038] (6) According to m 固体 :m 三羟甲基氨基甲烷 = 4.2, the solid obtained in step (5) was added to the prepared tris buffer (pH=8.5) with a molar concentration of 10 mM, and ultrasonicated for 0.5 h;

[0039] (7) According to the mass ...

Embodiment 2

[0044] (1) According to m 甲酰胺 :m 高锰酸钾 =47, fully stirring and dissolving potassium permanganate in formamide;

[0045] (2) According to m 水 :m 聚乙二醇 =14.5, polyethylene glycol 20000 was dissolved in deionized water to obtain a uniform mixed solution;

[0046] (3) According to m 步骤(2) :m 步骤(1) =1.32, the mixed solution obtained in step (2) was added to the mixed solution in step (1), and stirred at 80° C. for 15 min;

[0047] (4) Put the sol obtained in step (3) into a hydrothermal kettle, and react at 120° C. for 14 hours;

[0048] (5) After cooling to room temperature, the solid in the product obtained in step (4) was washed several times with deionized water and ethanol, and the washed product was placed in a vacuum oven at 50-60°C to dry;

[0049] (6) According to m 固体 :m 三羟甲基氨基甲烷 = 4.0, the solid obtained in step (5) was added to the prepared tris buffer solution (pH = 8.5) with a molar concentration of 10 mM, and ultrasonicated for 0.5 h;

[0050] (7) According t...

Embodiment 3

[0055] (1) According to m 甲酰胺 :m 高锰酸钾 =46, fully stirring and dissolving potassium permanganate in formamide;

[0056] (2) According to m 水 :m 聚乙二醇 =14.7, polyethylene glycol 20000 was dissolved in deionized water to obtain a uniform mixed solution;

[0057] (3) According to m 步骤(2) :m 步骤(1) =1.41, the mixed solution obtained in step (2) was added to the mixed solution in step (1), and stirred at 80° C. for 15 min;

[0058] (4) Put the sol obtained in step (3) into a hydrothermal kettle, and react at 140° C. for 14 hours;

[0059] (5) After cooling to room temperature, the solid in the product obtained in step (4) was washed several times with deionized water and ethanol, and the washed product was placed in a vacuum oven at 50-60°C to dry;

[0060] (6) According to m 固体 :m 三羟甲基氨基甲烷 = 3.9, the solid obtained in step (5) was added to the prepared tris buffer solution (pH = 8.5) with a molar concentration of 10 mM, and ultrasonicated for 0.5 h;

[0061] (7) According t...

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Abstract

The invention provides a preparation method of a carbon-coated manganese tetraoxide polyhedral negative electrode material for a lithium ion battery. The hollow Mn3O4 polyhedral material is obtained by a one-step hydrothermal method, and dopamine hydrochloride serves as a carbon source and is fired in an argon atmosphere, so that polydopamine is carbonized on polyhedral surfaces. As a firm polyhedral frame, a middle gap and a coated carbon shell of the synthesized negative electrode material form a triple buffering structure, volume expansion of the negative electrode material in the charge-discharge process is effectively relieved, and circulating stability of the material is greatly improved.

Description

technical field [0001] The invention relates to a negative electrode material for a lithium ion battery, specifically a carbon-coated trimanganese tetraoxide polyhedral negative electrode material (hereinafter referred to as Mn 3 o 4 @C). Background technique [0002] Manganese oxide-based materials are considered to be a class of anode materials for lithium-ion batteries with broad development prospects due to their high theoretical capacity, low cost, low toxicity, and broad practicability. [0003] The document "ACS Applied Materials Interfaces, 2012, 4:1636-1642" discloses a carbon-coated Mn 3 o 4 The method of nanorod composite material, mixing and stirring manganese acetate hydrate, ethylene glycol, polyvinyl pyrrolidone, and deionized water, and putting the obtained uniform mixed solution into a hydrothermal kettle, and then putting it in an electric furnace for 48 hours at 180°C After cooling down to room temperature, the obtained product was filtered, washed and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/62
CPCH01M4/505H01M4/625Y02E60/10
Inventor 黄英王明月张娜王科陈雪芳丁晓
Owner NORTHWESTERN POLYTECHNICAL UNIV
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