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A kind of spherical oxide alloy electrode material and preparation method thereof

An alloy electrode, alloying technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing product service life, precipitation of metallic lithium, dendrite short circuit, etc., to prolong cycle life, improve electronic conductivity, and improve Effects of Tapped and Compacted Density

Active Publication Date: 2021-02-26
SHANDONG ZHAOWEN NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The negative electrode materials used in commercially available lithium-ion batteries are mostly carbon materials, but it has a fatal problem, that is, when the battery is charged quickly or overcharged, metal lithium may be precipitated on the surface of the electrode material, and dendrites may form to cause a short circuit. This will not only reduce the service life of the product, but also pose a safety hazard

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  • A kind of spherical oxide alloy electrode material and preparation method thereof
  • A kind of spherical oxide alloy electrode material and preparation method thereof
  • A kind of spherical oxide alloy electrode material and preparation method thereof

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preparation example Construction

[0037] The present invention also provides a preparation method of a spherical oxide alloy electrode material, comprising the following steps:

[0038] (1) Put the lithium source, titanium dioxide, M metal ion source and medium solution in the reaction kettle, and disperse to obtain the precursor;

[0039] (2) Grinding the precursor obtained in step (1) to obtain a uniformly dispersed nanoscale precursor;

[0040] (3) spraying and granulating the nano-precursor obtained in step (2) to obtain a dry spherical precursor;

[0041] (4) Place the dry spherical precursor obtained in step (3) in an air or inert gas atmosphere for pre-sintering and re-sintering, the temperature of the pre-sintering is 450~600°C, and the time of pre-sintering is 5~10h , the re-sintering temperature is 700-850° C., the re-sintering time is 10-16 hours, cooled to room temperature, and obtained.

[0042] In the present invention, unless otherwise specified, the raw materials used are commercially availab...

Embodiment 1

[0057] Material ratio: the metal ion is Mg, the molar ratio of titanium ions to metal ions is 5:0.2, and the molar ratio of lithium ions to titanium ions is 4:5.

[0058] (1) Put lithium hydroxide monohydrate, titanium dioxide, nano-magnesium oxide and ethanol solution in the reaction kettle according to the above ratio, the solid-to-liquid ratio is 1:2, keep stirring and ultrasonically dispersing for 4 hours, the speed is 200r / min, get the precursor.

[0059] (2) Place the precursor obtained in step (1) in a high-energy ball mill for high-intensity ball milling at a speed of 1500r / min until the D50 is 0.5 μm to obtain a uniformly dispersed nano precursor.

[0060] (3) Spray and granulate the nano-precursor obtained in step (2), the air inlet temperature is 200°C, the outlet air temperature is controlled at 100°C, and the rotation speed is 20,000r / min to obtain a dry spherical precursor with a D50 of 0.5 μm. The particles are aggregated into secondary spherical particles with...

Embodiment 2

[0063] Material ratio: metal ions are Zn and Ag, the molar ratio of the two metal ions satisfies Zn:Ag =1:1, the molar ratio of titanium ions and the above two metal ions is 5:0.18, the molar ratio of lithium ions and titanium ions The ratio is 4.2:5.

[0064] (1) Put the lithium source, titanium dioxide, zinc acetate, silver nitrate and ethanol solution in the reaction kettle according to the above ratio, the solid-to-liquid ratio is 1:3, keep stirring and ultrasonically dispersing for 4.5h, the speed is 200r / min, get the precursor.

[0065] (2) Place the precursor obtained in step (1) in a high-energy ball mill for high-intensity ball milling for 5 hours at a rotational speed of 1500r / min until the D50 is 0.5 μm to obtain a uniformly dispersed nano-precursor.

[0066] (3) Spray and granulate the nano-precursor obtained in step (2). The air inlet temperature is 200°C, the outlet air temperature is controlled at 85°C, and the rotation speed is 20,000r / min to obtain a dry sphe...

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Abstract

The invention relates to a spherical oxidized alloy electrode material. The spherical oxidized alloy electrode material is an oxide alloy lithium compound doped with one or more metal ions. The surface of the oxidized alloy lithium compound is coated with a metal oxide at the same time, the metal oxide is a secondary spherical particle formed by aggregating nano particles, and the general chemicalformula is Li4Ti5-xMxO12.(MyO); and through doping of one or more metal ions, the conductivity of the oxidized alloy lithium compound can be improved; the electrochemical performance is improved, thecondition process and the metal ion amount are controlled, the surface of the oxidized alloy lithium compound is coated with the metal oxide, reduction decomposition of the electrolyte is effectivelyinhibited, gas production is inhibited, then the cycling stability of the battery is improved, the gas expansion problem is effectively solved, and the high-rate charging cycle life is prolonged.

Description

technical field [0001] The invention relates to a preparation method of a spherical oxide alloy electrode material, which belongs to the field of new energy. Background technique [0002] At present, lithium-ion batteries occupy the largest market share of rechargeable batteries, and are widely used in civilian portable electronic devices such as mobile phones, notebook computers, and MP3 players. In recent years, people have gradually applied them to power equipment. Hybrid vehicles have also entered the market. The negative electrode materials used in commercially available lithium-ion batteries are mostly carbon materials, but it has a fatal problem, that is, when the battery is charged quickly or overcharged, metal lithium may be precipitated on the surface of the electrode material, and dendrites may form to cause a short circuit. This will not only reduce the service life of the product, but also pose potential safety hazards. With the rapid increase of the lithium-i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/54H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/54H01M4/62H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 李文李振杰李亚昭
Owner SHANDONG ZHAOWEN NEW ENERGY TECH CO LTD
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