Ternary positive material of core-shell structure lithium ion battery and preparation method thereof

A lithium-ion battery, core-shell structure technology, applied to battery electrodes, electrical components, secondary batteries, etc., can solve the problems of poor rate performance and stability of ternary positive electrode materials, hinder lithium-ion batteries, etc., and achieve improved battery life. The effects of chemical properties, strong operability, and excellent electrical properties

Inactive Publication Date: 2018-06-15
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD +1
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Problems solved by technology

However, with the continuous improvement of capacity, the rate performance and stability of ternary cathode material...

Method used

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  • Ternary positive material of core-shell structure lithium ion battery and preparation method thereof
  • Ternary positive material of core-shell structure lithium ion battery and preparation method thereof

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Embodiment 1

[0037] A sulfate solution (Ni:Co:Mn:Al=8:1:1:0.2) with a total metal ion concentration of 1.5mol / L is prepared. Add the above-mentioned mixed solution together with ammonia water and sodium hydroxide into the reaction kettle containing the mixed solution of ammonia water and sodium hydroxide, and adjust the speed of the reaction kettle to 300 r / min and the temperature to 55 degrees. The ammonium concentration of the mother liquor is adjusted to 6-8g / L and the pH is 12, so that the uniformly mixed nickel, cobalt, and manganese in the solution are precipitated together according to the chemical dose ratio. After that, the feed of raw materials was stopped and carbon dioxide gas was introduced. Finally, the precursor is filtered, washed, and dried. Finally, take lithium hydroxide: the precursor = 1.05:1, pre-sintered at 400-450°C for 3 hours in an oxygen atmosphere, and then heated to 800-1000°C for 14 hours to obtain the three core-shell structure Meta material.

[0038] T...

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Abstract

The invention discloses a preparation method of a ternary positive material of a core-shell structure lithium ion battery. The preparation method comprises the following steps: (1) preparing a multi-element mixed solution of nickel salt, cobalt salt, manganese salt and aluminum salt; (2) under a protective atmosphere, adding the multi-element mixed solution, ammonia water and sodium hydroxide intoa reaction device containing a base solution, and carrying out a co-precipitation reaction to obtain an NCM hydroxide precursor; (3) introducing carbon dioxide gas so that an aluminum hydroxide coating layer is formed on the surface of the NCM precursor; and (4) filtering, washing and drying the precursor, and then adding a lithium source to carry out heat treatment so as to obtain an NCM material, wherein the surface of the NCM material is coated with aluminum oxide. The obtained precursor of a core-shell structure is uniform in pore distribution, moderate in interval and large in specific surface area. The positive material of the core-shell structure lithium ion battery is obtained through further treatment of the obtained precursor and the lithium salt, and the positive material has high charge-discharge specific capacity, long cyclic stability performance and good rate capability.

Description

Technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a ternary positive electrode material of a core-shell structure lithium ion battery and a preparation method thereof. Background technique [0002] At present, fossil fuels are still the main power source. However, with the unreasonable exploitation and utilization of human beings, fossil energy is becoming increasingly tense and environmental pollution is becoming more and more serious. Therefore, the development and utilization of new clean resources and renewable energy sources, such as solar, wind, and tidal energy, has become a top priority. On the other hand, the normal operation of the power grid requires stable and continuous power generation. Solar energy, wind energy, tidal energy, etc. are restricted by factors such as weather, location and time, which greatly limit its large-scale application and popularization. In order to solve this problem, lar...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 汤依伟吴理觉尚国志郭权文
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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