A modified ncm622 thin film cathode material and its preparation and application

A technology of thin-film positive electrode and positive electrode material, applied in battery electrodes, structural parts, secondary battery repair/maintenance, etc. Improve processing performance and electrochemical performance, low surface moisture and residual alkali, and enhance the effect of structural stability

Active Publication Date: 2020-07-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] NCM622 also has some problems, the most important of which is that the material is easy to absorb water, so it is easy to generate residual alkali on its surface, which will affect the processing performance and electrochemical performance of the material; , the ternary thermal decomposition temperature decreases and the heat release increases, so the thermal stability under the charge and discharge state is poor; the cycle stability of NCM622 under high temperature and high voltage is not good. During the cycle, the material will be corroded by the electrolyte, resulting in the dissolution of metal ions , the interface impedance increases, the structural stability decreases, and the cycle performance deteriorates

Method used

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  • A modified ncm622 thin film cathode material and its preparation and application

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Embodiment 1

[0039] The present embodiment provides a kind of preparation method of the modified NCM622 thin film cathode material, wherein, said method comprises the following steps:

[0040] (1) Pretreatment of the substrate:

[0041] Carry out ultrasonic cleaning to FTO conductive glass with acetone, absolute ethanol, deionized water successively, then this FTO conductive glass after ultrasonic cleaning is dried, standby;

[0042] (2) Cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 (NCM622) film preparation:

[0043] The NCM622 film was prepared by pulsed laser deposition technology, the specific method is as follows:

[0044] The NCM622 powder was made into a circular target with a radius of 1 cm under a pressure of 20 MPa, and then the circular target was sintered in an electric furnace at 800 ° C for 5 h. The FTO conductive glass pretreated in step (1) was used as the substrate. The distance between the sheet and the circular target was kept at 30mm, and the system was evacuated to...

Embodiment 2

[0054] The present embodiment provides a kind of preparation method of the modified NCM622 thin film cathode material, wherein, said method comprises the following steps:

[0055] (1) Pretreatment of the substrate:

[0056] Carry out ultrasonic cleaning to FTO conductive glass with acetone, absolute ethanol, deionized water successively, after this FTO conductive glass after ultrasonic cleaning is dried, standby;

[0057] (2) Cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 (NCM622) film preparation:

[0058] The NCM622 thin film was prepared by pulsed laser deposition (PLD), the specific method is as follows:

[0059] NCM622 powder was made into a circular target with a radius of 3 cm under a pressure of 25 MPa, and then the circular target was sintered in an electric furnace at 850 ° C for 6 h. The FTO conductive glass pretreated in step (1) was used as the substrate. The distance between the sheet and the circular target was kept at 31mm, and the system was evacuated to 0....

Embodiment 3

[0068] The present embodiment provides a kind of preparation method of the modified NCM622 thin film cathode material, wherein, said method comprises the following steps:

[0069] (1) Pretreatment of the substrate:

[0070] Carry out ultrasonic cleaning to FTO conductive glass with acetone, absolute ethanol, deionized water successively, after this FTO conductive glass after ultrasonic cleaning is dried, standby;

[0071] (2) Cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 (NCM622) film preparation:

[0072] The NCM622 thin film was prepared by pulsed laser deposition (PLD), the specific method is as follows:

[0073] The NCM622 powder is made into a circular target with a radius of 4cm under a pressure of 26 MPa, and then the circular target is placed in an electric furnace at 890 ° C for 7 hours, and the FTO conductive glass pretreated in step (1) is used as the substrate. The distance between the substrate and the target was kept at 38mm, and the system was evacuated to 0...

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Abstract

The invention provides a modified NCM622 thin film anode material and preparation and application thereof. The modified NCM622 thin film anode material comprises an NCM622 thin film base layer and a Cu2ZnSnS4 thin film coating layer uniformly wrapping the surface of the NCM622 thin film base layer; the material effectively solves the problem that an exiting NCM622 material is strong in water absorption, and has a low requirement for environmental humidity, and the storage performance of the modified NCM622 thin film anode material is improved; in addition, surface moisture and residual alkaliof the material are both low, and machining and electrochemical properties of the material are improved; and according to the NCM622 thin film anode material uniformly wrapped with a Cu2ZnSnS4 thin film, the Cu2ZnSnS4 thin film coating layer further enhances the structural stability of the NCM622 anode material and reduces contact between the modified NCM622 thin film anode material and an electrolyte, corrosion can be reduced, interfacial impedance is reduced, and thus the effects of structural stability and cycle performance improvement are achieved.

Description

technical field [0001] The invention relates to a modified NCM622 thin film positive electrode material and its preparation and application, belonging to the technical field of lithium ion battery positive electrode materials. Background technique [0002] With the reduction of the supply of fossil fuel resources and the intensification of environmental degradation caused by excessive emissions of greenhouse gases, the research and development of new renewable green and clean energy is becoming more and more important. Due to its high operating voltage, energy density, long life and environmental friendliness, lithium-ion batteries have become the power source for a new generation of electric vehicles, power tools and electronic products. At present, lithium-ion batteries have been widely used in different fields such as energy, transportation, and communication. At the end of 2015, in the new energy vehicle pilot project issued by the Ministry of Science and Technology, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525H01M10/42
CPCY02E60/10
Inventor 刘兴亮杨茂萍夏昕李道聪陈厚梅
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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