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A kind of negative electrode material of lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increased system resistance, decreased connection, volume change, etc., to improve stability, reduce internal resistance, and reduce volume changes. Effect

Active Publication Date: 2021-04-13
唐山东日新能源材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, manganese dioxide, as an anode material for lithium-ion batteries, also faces problems similar to those of other transition metal oxide anode materials.
In the process of charging and discharging, manganese dioxide is prone to significant volume changes, resulting in pulverization of electrode materials, reduced connection between each other, and increased system resistance; or falling off from the surface of the current collector, resulting in loss of active materials, thus affecting manganese dioxide. The service life of the negative electrode material

Method used

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  • A kind of negative electrode material of lithium ion battery and preparation method thereof
  • A kind of negative electrode material of lithium ion battery and preparation method thereof

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preparation example Construction

[0019] To achieve the above object, the invention provides a preparation method of lithium ion battery negative electrode material, comprising the following steps:

[0020] (1) Mix the manganese source and the zinc source in an organic solvent evenly, then add terephthalic acid, mix evenly and seal the reaction at 120-180°C for 3-8 hours to obtain the precursor A;

[0021] (2) Precursor A is heat-treated at 180-250° C. in a water vapor atmosphere to obtain a negative electrode material for a lithium-ion battery.

[0022] In the present invention, by simultaneously reacting manganese source and zinc source with terephthalic acid (PTA) ligand, zinc-doped Mn(PTA) is generated n , that is, precursor A, heat-treating precursor A in water vapor can oxidize manganese and zinc in the molecular structure of precursor A into manganese dioxide and zinc dioxide, that is, to obtain Mn x Zn 1-x O-PTA material, which is a metal oxide organic framework with manganese dioxide and zinc dioxid...

Embodiment 1

[0041] a. Preparation of negative electrode materials for lithium-ion batteries:

[0042] (1) Mix manganese chloride and zinc chloride in DMF evenly, then add terephthalic acid, mix evenly and seal and react at 150°C for 5 hours to obtain precursor A;

[0043] The mol ratio of the manganese chloride to the zinc chloride is 3:1;

[0044] (2) Put the precursor A and water into the tube furnace together, then pass nitrogen gas for 20 minutes to remove the air in the tube furnace, and then raise the temperature of the tube furnace to 220 °C at a heating rate of 3 °C / min for heat treatment 3h, namely obtain the negative electrode material of lithium ion battery.

[0045] b. Preparation of lithium ion battery negative electrode:

[0046] With the lithium-ion battery negative electrode material prepared in step a as the negative electrode active material, the negative electrode active material, the conductive agent and the binding agent are mixed uniformly in a vacuum mixer to obta...

Embodiment 2

[0052] Lithium-ion battery anode material preparation:

[0053] (1) Mix manganese chloride and zinc chloride in DMF evenly, then add terephthalic acid, mix evenly and seal and react at 130°C for 4 hours to obtain precursor A;

[0054] The mol ratio of the manganese chloride to the zinc chloride is 2:1;

[0055] (2) Put the precursor A and water into the tube furnace together, then pass nitrogen gas for 20 minutes to remove the air in the tube furnace, and then raise the temperature of the tube furnace to 220 °C at a heating rate of 3 °C / min for heat treatment 4h, namely obtain the negative electrode material of lithium ion battery.

[0056] Using the above-mentioned lithium ion battery negative electrode material as the negative electrode active material;

[0057] The preparation method of the lithium ion battery is the same as the preparation method of the lithium ion battery in Example 1 to obtain the lithium ion battery A2.

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Abstract

The present invention relates to the technical field of lithium batteries, in particular to a lithium ion battery negative electrode material and a preparation method thereof. The preparation method comprises: (1) mixing a manganese source and a zinc source in an organic solvent evenly, and then adding terephthalate Formic acid, mixed evenly, sealed and reacted at 120-180°C for 3-8 hours to obtain precursor A; (2) heat-treating precursor A at 180-250°C in a water vapor atmosphere to obtain the lithium-ion battery negative electrode material; In the present invention, the manganese source and the zinc source are simultaneously reacted with the terephthalic acid ligand to generate zinc-doped Mn(PTA) n , the precursor A is heat-treated in water vapor to obtain Mn x Zn 1‑x O‑PTA material, which is a metal oxide organic framework with manganese dioxide and zinc dioxide as active centers, this structure can reduce the volume change of manganese dioxide during charging and discharging, thereby improving material stability and reducing The internal resistance of the material can extend the cycle life of the manganese dioxide electrode material and improve the performance of rate discharge.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high open-circuit voltage, high energy density, long service life, no memory effect, less pollution, and low self-discharge rate. Its overall performance is superior to other traditional secondary batteries, and it is unanimously considered as a variety of portable batteries. The most ideal power supply for electronic equipment and electric vehicles. Although graphite, the negative electrode material of traditional lithium-ion batteries, has good cycle stability and high cost performance, due to its low charge-discharge specific capacity and no advantage in volume specific capacity, it is difficult to meet the high requirements of power systems, especially electric vehicles and hybrid electric vehicles. capacity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/362H01M4/505H01M4/62H01M4/624H01M10/0525Y02E60/10
Inventor 曹立军
Owner 唐山东日新能源材料有限公司
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