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A highly stable lithium-ion battery

A lithium-ion battery, high stability technology, applied in the manufacture of battery electrodes, secondary batteries, electrolyte batteries, etc., can solve the problems of volume change, system resistance increase, active material loss, etc., to reduce volume change and improve stability , good electrical conductivity

Active Publication Date: 2021-10-19
广州明美新能源股份有限公司
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  • Summary
  • 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 highly stable lithium-ion battery
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Examples

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preparation example Construction

[0021] Under preferred conditions, the Mn 1-x Zn x o 2 -The preparation method of PTA comprises the following steps:

[0022] (1) Mix the manganese source and the zinc source in an organic solvent evenly, then add terephthalic acid, after mixing evenly, seal and react at 120-180°C for 3-8 hours to obtain the precursor A;

[0023] (2) Precursor A is heat-treated at 180-250°C in a water vapor atmosphere to obtain the lithium battery negative electrode active material Mn 1-x Zn x o 2 -PTA.

[0024] In the present invention, manganese source and zinc source are reacted with terephthalic acid (PTA) ligand simultaneously to generate zinc-doped Mn (PTA) 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 1-x Zn x o 2 -PTA material, which is a metal oxide organic framework with manganese dioxide and zinc dioxide as active cente...

Embodiment 1

[0039] a. Preparation of negative electrode materials for lithium-ion batteries:

[0040] (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;

[0041] The mol ratio of the manganese chloride to the zinc chloride is 3:1;

[0042] (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.

[0043] b. Preparation of lithium ion battery negative electrode:

[0044] 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

[0050] Lithium-ion battery anode material preparation:

[0051] (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;

[0052] The mol ratio of the manganese chloride to the zinc chloride is 2:1;

[0053] (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.

[0054] Using the above-mentioned lithium ion battery negative electrode material as the negative electrode active material;

[0055] 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 invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery with high stability, comprising a positive electrode, a negative electrode, a diaphragm and an electrolyte, and the negative electrode comprises a negative electrode active material, a conductive agent and a binder, and is characterized in that: The negative electrode active material is Mn x Zn 1‑x O‑PTA, where 0.1≤x≤0.5; in the present invention, the manganese source and the zinc source are simultaneously reacted with terephthalic acid ligands to generate zinc-doped Mn(PTA) n , heat treatment of precursor A in water vapor to obtain Mn x Zn 1‑x O‑PTA material 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 prolong the cycle life of the manganese dioxide electrode material and improve the performance of the rate discharge.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a highly stable lithium ion battery. 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 requirements. Therefore, it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/60H01M10/0525H01M10/058
CPCH01M4/362H01M4/485H01M4/505H01M4/60H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 曹立军
Owner 广州明美新能源股份有限公司
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