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A high-magnification spherical oxide alloy composite electrode material and its preparation method

A composite electrode and high-magnification technology, which is applied in chemical instruments and methods, battery electrodes, titanium compounds, etc., can solve the problems of reducing product life, precipitation of metal lithium, and safety, so as to prolong cycle life and improve electronic conductivity , improve the effect of flatulence

Active Publication Date: 2021-10-19
SHANDONG ZHAOWEN NEW ENERGY TECH CO LTD
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  • Summary
  • 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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  • A high-magnification spherical oxide alloy composite electrode material and its preparation method
  • A high-magnification spherical oxide alloy composite electrode material and its preparation method
  • A high-magnification spherical oxide alloy composite electrode material and its preparation method

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preparation example Construction

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

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

[0043] (2) Grinding the precursor obtained in step (1) to obtain a uniformly dispersed nanoscale precursor;

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

[0045] (4) Place the dried spherical precursor obtained in step (3) in an inert gas atmosphere for pre-sintering and re-sintering. The re-sintering temperature is 700~850°C, the re-sintering time is 10~16h, and cooled to room temperature.

[0046] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the ...

Embodiment 1

[0062] Ratio of materials: The high conductive carbon phase raw material is carbon nanotubes, metal ions are Mg, the molar ratio of titanium ions to metal ions is 5:0.05, the molar ratio of lithium ions to titanium ions is 4.1:5, carbon nanotubes and titanium The molar ratio is 0.05:5.

[0063] (1) Lithium hydroxide monohydrate, titanium dioxide, zirconium nitrate, lithium niobate, ammonium metavanadate, nano-magnesium oxide, carbon nanotubes and ethanol solution are placed in a reaction kettle with a solid-to-liquid ratio of 1:2. Stir continuously and ultrasonically disperse for 4 hours at a speed of 200 r / min to obtain a precursor.

[0064] (2) Place the precursor obtained in step (1) in a high-energy ball mill for high-intensity ball milling for 5 hours at a 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 air inlet temperature is 200°C, the outlet ai...

Embodiment 2

[0068] Ratio of materials: 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 satisfies Ba:Ag =1:1, and the molar ratio of titanium ions and the above two other metal ions is 5:0.2, the molar ratio of lithium ions to titanium ions is 4.4:5, and the molar ratio of carbon nanotubes 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, stir continuously and ultrasonically disperse for 5 hours at a speed of 200r / min to get the precursor.

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

[0071] (3) Spray and granulate the nano-precursor obtained in...

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Abstract

The invention relates to a high-magnification spherical oxide alloy composite electrode material, which is an oxide alloy lithium compound doped with one or more metal ions, and the surface of the oxide alloy lithium compound is simultaneously coated with a metal oxide, and the surface is also It is compounded with a highly conductive carbon phase, which is a secondary spherical particle aggregated by nanoparticles, and its general chemical formula is Li 4 Ti 5‑x m x O 12 ·(M y O), which can greatly improve the conductivity of oxidized alloy lithium compounds especially at high rates through metal ion doping and composite high-conductivity carbon phase, and improve the electrochemical performance, and by controlling the amount of metal ions in the oxidation process, The surface of the alloy lithium compound is coated with metal oxides, which can effectively inhibit the reduction and decomposition of the electrolyte and gas production, thereby improving the cycle stability of the battery, effectively improving the problem of flatulence, and prolonging the cycle life of high-rate charging.

Description

technical field [0001] The invention relates to a high-magnification spherical oxide alloy composite electrode material and a preparation method thereof, belonging 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 t...

Claims

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Application Information

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Patent Type & Authority Patents(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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