Modified positive electrode material and preparation method thereof

A positive electrode material and modification technology, applied in the direction of positive electrode, active material electrode, battery electrode, etc., can solve the problems of poor rate performance and poor cycle performance, so as to avoid direct contact, increase transmission rate, improve cycle performance and rate performance effect

Active Publication Date: 2019-08-23
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Another object of the present invention includes providing a method for preparing a modified positive electrode material, which uses a spray drying method to carry out surface copper oxidation on the ternary positive electrode mate

Method used

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  • Modified positive electrode material and preparation method thereof
  • Modified positive electrode material and preparation method thereof

Examples

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Example Embodiment

[0037] Example 1

[0038] This embodiment provides a modified cathode material, which is prepared by the following method:

[0039] S1: Add the nickel-cobalt lithium aluminate cathode material to the container containing the copper sulfate solution, use a double planetary mixer with a revolution linear speed of 2m / s and a rotation linear speed of 10m / s, and the stirring time is 300min to make the material fully slurry. Use a peristaltic pump to input the slurry into the spray dryer for spray drying (inlet temperature is 300°C, outlet temperature is 110°C), and the dried powder is placed in a muffle furnace at a temperature of 5°C / min The speed is raised to 500°C, the temperature is kept for 5 hours in an oxygen atmosphere, and then it is cooled to room temperature with the furnace, and the NCA@CuO cathode material is obtained after grinding, crushing and sieving;

[0040] S2: Dissolve glucose evenly in deionized water at a temperature of 40°C, prepare a solution with a concentration...

Example Embodiment

[0043] Example 2

[0044] This embodiment provides a modified cathode material, which is prepared by the following method:

[0045] S1: Add the positive electrode material of nickel cobalt lithium aluminate to the container containing the copper nitrate solution, use a double planetary mixer with revolution linear velocity 4m / s and rotation linear velocity 20m / s, stirring time is 100min, so that the material is fully slurried. Use a peristaltic pump to input the slurry into the spray dryer for spray drying (inlet temperature is 350°C, outlet temperature is 120°C), and the dried powder is placed in a muffle furnace at a temperature of 3°C / min The speed is raised to 550°C, the temperature is kept for 6 hours in an oxygen atmosphere, and then cooled to room temperature in the furnace, after grinding, crushing, and sieving, the NCA@CuO cathode material is obtained;

[0046] S2: Dissolve sucrose evenly in deionized water at a temperature of 50°C, prepare a solution with a concentration o...

Example Embodiment

[0048] Example 3

[0049] This embodiment provides a modified cathode material, which is prepared by the following method:

[0050] S1: Add the nickel-cobalt lithium aluminate cathode material to the container with the copper chloride solution, use a double planetary mixer at a revolution linear velocity of 4m / s and a rotation linear velocity of 25m / s, and the stirring time is 60min to make the material fully slurry. , Use a peristaltic pump to input the slurry into the spray dryer for spray drying (inlet temperature is 400°C, outlet temperature is 80°C), and the dried powder is placed in a muffle furnace at 10°C / min The temperature rise rate is raised to 400℃, kept in an oxygen atmosphere for 3 hours, and then cooled to room temperature in the furnace, after grinding, crushing, and sieving, the NCA@CuO cathode material is obtained;

[0051] S2: Dissolve glucose uniformly in deionized water at a temperature of 60℃, prepare a solution with a concentration of 0.2mol / L, and then put it...

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Abstract

The invention discloses a modified positive electrode material and a preparation method thereof, and relates to the technical field of batteries. The positive electrode material comprises an inner core, a first coating layer and a second coating layer which are sequentially arranged from inside to outside, wherein the inner core is a lithium nickel cobalt aluminate positive electrode material, thefirst coating layer is copper oxide, and the second coating layer is a carbon sphere. The modified positive electrode material is prepared by a secondary coating modification means; the surface of the lithium nickel cobalt aluminate is coated with uniform and compact coating layer copper oxide and high-conductivity nano carbon spheres, thereby avoiding the direct contact between the electrolyte and the active material, improving the transmission rate of electrons and the diffusion rate of lithium ions while the structure is stabilized in the charging and discharging process, and finally improving the cycle performance and the rate capability of an NCA positive electrode material. According to the method, the surface of the ternary positive electrode material NCA is coated with copper oxide through a spray drying method, and the NCA is subjected to carbon coating by an ultrasonic wetting assisting chemical method, so that the problems of poor cycle performance, poor rate capability andthe like of the NCA material can be solved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a modified positive electrode material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of portable devices and long-range electric vehicles, higher requirements have been placed on the comprehensive performance (energy density, cycle life, rate performance, and safety performance) of rechargeable lithium-ion batteries. Traditional cathode materials such as LiCoO 2 、LiFePO 4 Due to its low energy density, it has gradually been used as a high-nickel cathode material LiNi x m 1- x o 2 (X>0.6, M=Co, Mn, Al) instead. In high-nickel positive electrode materials, nickel-cobalt lithium aluminate (LiNi 0.8 co 0.15 Al 0.05 o 2 , referred to as NCA) due to its excellent discharge specific capacity (> 180mA h g -1 ), high energy density and relatively low cost have been successfully used as power batteries in Tesl...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/485H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 余剑琳马美品蔡惠群李海军
Owner YINLONG ENERGY CO LTD
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