High-magnification spherical oxidized alloy composite electrode material and preparation method thereof

A composite electrode and high-magnification technology, applied in chemical instruments and methods, battery electrodes, titanium compounds, etc., can solve the problems of reducing product life, precipitation of metal lithium, dendrite short circuit, etc., to prolong cycle life and improve electronic conductivity performance, increase the effect of tap density and compaction density

Active Publication Date: 2020-04-28
SHANDONG ZHAOWEN NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • High-magnification spherical oxidized alloy composite electrode material and preparation method thereof
  • High-magnification spherical oxidized alloy composite electrode material and preparation method thereof
  • High-magnification spherical oxidized alloy composite electrode material and preparation method thereof

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preparation example Construction

[0041] The invention also provides a method for preparing a high-rate spherical oxide alloy composite electrode material, which includes the following steps:

[0042] (1) Place the lithium source, titanium dioxide, M metal ion source, high-conductivity carbon phase raw material and medium solution in the reaction kettle, and disperse to obtain the precursor;

[0043] (2) Grind the precursor obtained in step (1) to obtain a uniformly dispersed nano-scale precursor;

[0044] (3) Spray granulating the nano precursor obtained in step (2) to obtain a dry spherical precursor;

[0045] (4) The dry spherical precursor obtained in step (3) is placed in an inert gas atmosphere for pre-sintering and re-sintering. The temperature of the pre-sintering is 450-600℃, and the time of the pre-sintering is 5-10h. The temperature of re-sintering is 700~850℃, the time of re-sintering is 10~16h, and it is obtained by cooling to room temperature.

[0046] In the present invention, unless otherwise specified,...

Embodiment 1

[0062] Material ratio: the high-conductivity carbon phase raw material is carbon nanotubes, the metal ion is Mg, the molar ratio of titanium ion to metal ion is 5:0.05, the molar ratio of lithium ion to titanium ion is 4.1:5, carbon nanotube and titanium The molar ratio is 0.05:5.

[0063] (1) Put lithium hydroxide monohydrate, titanium dioxide, zirconium nitrate, lithium niobate, ammonium metavanadate, nano-magnesium oxide, carbon nanotubes and ethanol solution in a reaction kettle with a solid-liquid ratio of 1:2. Stop stirring and ultrasonic dispersion for 4h, rotating speed 200r / min, to obtain the precursor.

[0064] (2) Place the precursor obtained in step (1) in a high-energy ball mill for high-strength ball milling for 5 hours at a rotation speed of 1500 r / min and control D50 to 0.5 μm to obtain a uniformly dispersed nano precursor.

[0065] (3) Spray and granulate the nano-precursor obtained in step (2), the inlet air temperature is 200°C, the outlet air temperature is contr...

Embodiment 2

[0068] Material ratio: The high-conductivity carbon phase raw material is carbon nanotubes, the metal ions are Ba and Ag, the molar ratio of the two metal ions meets Ba:Ag =1:1, and the molar ratio of titanium ion to the above two other metal ions is 5:0.2, the molar ratio of lithium ion to titanium ion is 4.4:5, and the molar ratio of carbon nanotube to titanium is 0.03:5.

[0069] (1) Put lithium hydroxide monohydrate, titanium dioxide, barium carbonate, silver nitrate, carbon nanotubes and ethanol solution in a reaction kettle with a solid-to-liquid ratio of 1:2, and carry out continuous stirring and ultrasonic dispersion for 5 hours at a speed of 200r / min, get the precursor.

[0070] (2) The precursor obtained in step (1) is placed in a high-energy ball mill for high-intensity ball milling for 4.5 hours at a rotation speed of 1800 r / min, and D50 to 0.1 μm is controlled to obtain a uniformly dispersed nano-precursor.

[0071] (3) The nano-precursor obtained in step (2) is spraye...

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Abstract

The invention relates to a high-magnification spherical oxidized alloy composite electrode material. The 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; meanwhile, a high-conductivity carbon phase is compounded on the surface; the spherical particle is a secondary spherical particle formed by aggregating nano particles, the general chemical formula is Li < 4 > Ti < 5-x > M < x > O < 12 >. (M < y > O), through metal ion doping and compounding of a high-conductivity carbon phase, the conductivity of the oxidized alloy lithium compound at a high rate can be greatly improved; the electrochemical performance is improved, the metal oxide is coated on the surface of theoxidized alloy lithium compound by controlling the amount of metal ions in a condition process, so that the reduction decomposition of an electrolyte is effectively inhibited, the gas production is inhibited, the cycling stability of the battery is further improved, the gas expansion problem is effectively improved, and the high-rate charging cycle life is prolonged.

Description

Technical field [0001] The invention relates to a high-rate spherical oxide alloy composite electrode material and a preparation method thereof, and 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. In recent years, people have gradually applied them to power equipment, lithium-ion batteries and petroleum 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. When the battery is fast or overcharged, metallic lithium may precipitate on the surface of the electrode material and form dendrites to cause a short circuit. This will not only reduce the service life of the product, but also have safety hazards. With the rapid growth of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62C01G23/00H01M10/0525
CPCC01G23/002C01P2002/72C01P2004/03C01P2004/04H01M4/366H01M4/485H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 李文李振杰李亚昭
Owner SHANDONG ZHAOWEN NEW ENERGY TECH CO LTD
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