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NCM ternary cathode material with surface layer doping of Ce<3+> and surface layer coating of CeO2 and preparation method of the ternary cathode material

A positive electrode material and surface layer technology, applied in the field of chemical energy storage batteries, can solve the problems of capacity and structure attenuation, poor cycle stability, etc., and achieve the effects of slowing down the growth rate, low price, and wide sources

Active Publication Date: 2019-02-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But pure Ce 3+ doped or CeO 2 The coated NCM ternary cathode materials still have poor cycle stability, and the capacity and structure decay seriously with the electrochemical process.

Method used

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  • NCM ternary cathode material with surface layer doping of Ce&lt;3+&gt; and surface layer coating of CeO2 and preparation method of the ternary cathode material
  • NCM ternary cathode material with surface layer doping of Ce&lt;3+&gt; and surface layer coating of CeO2 and preparation method of the ternary cathode material
  • NCM ternary cathode material with surface layer doping of Ce&lt;3+&gt; and surface layer coating of CeO2 and preparation method of the ternary cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Add cerium nitrate and NCM into ethanol according to the molar ratio Ce:NCM=0.01:1, and sonicate for 1 h, then mix and grind them evenly with ethanol in a mortar, calcinate at 400°C for 5 h, and cool with the furnace to obtain the final product, record for post-Ce-400.

[0068] The XRD test results of post-Ce-400 are as follows figure 1 As shown, it can be seen that the position of the main peak of post-Ce-400 in this embodiment is basically the same as that of the main peak in the comparative example. In the range of 20-40 degrees, there is no miscellaneous peak phase generation, which means that there is no CeO 2 generate. According to the XRD Rietveld refinement results, in the post-Ce-400 sample, Ni 2+ The atomic percentage in the Li layer is 1.92%, indicating that Li + / Ni 2+ The shuffling problem has been improved.

[0069] The SEM test results of post-Ce-400 are as follows image 3 As shown, it can be seen that the material sample can maintain its spherical...

Embodiment 2

[0080] Add cerium nitrate and NCM into ethanol according to the molar ratio Ce:NCM=0.01:1, and sonicate for 1 hour, then mix and grind them evenly with ethanol in a mortar, calcinate at 500°C for 5 hours, and cool with the furnace to obtain the final product, namely A surface doped Ce 3+ And the surface layer is coated with CeO 2 NCM ternary cathode material, denoted as post-Ce-500.

[0081] The XRD test results of post-Ce-500 are as follows figure 1 As shown, the position of the main peak in this embodiment is basically the same as that in the comparative example, and within the range of 20-40 degrees, there is a miscellaneous peak phase CeO 2 peak generation, implying CeO on the surface of the material 2 generate. According to the XRD Rietveld refinement results, in the post-Ce-500 sample, Ni 2+ The atomic percentage in the Li layer is 1.71%, indicating that Li + / Ni 2+ The shuffling problem has been improved.

[0082] The SEM test results of post-Ce-500 are as follo...

Embodiment 3

[0094] Cerium nitrate and NCM are added into ethanol according to the molar ratio Ce:NCM=0.01:1, and ultrasonicated for 1 hour, then mixed and ground with ethanol in a mortar, calcined at 600°C for 5 hours, and cooled with the furnace to obtain the final product, namely A surface doped Ce 3+ And the surface layer is coated with CeO 2 NCM ternary cathode material, denoted as post-Ce-600.

[0095] The XRD test results of post-Ce-600 are as follows figure 1 As shown, the position of the main peak in this embodiment is basically the same as that in the comparative example, and within the range of 20-40 degrees, there is a miscellaneous peak phase CeO 2 peak generation, implying CeO on the surface of the material 2 generate. According to the XRD Rietveld refinement results, in the post-Ce-400 sample, Ni 2+ The atomic percentage in the Li layer is 1.46%, and its Li + / Ni 2+ The shuffling problem has been improved.

[0096] The SEM test results of post-Ce-600 are as follows ...

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Abstract

The invention relates to an NCM ternary cathode material with surface layer doping of Ce<3+> and surface layer coating of CeO2 and a preparation method of the ternary cathode material, and belongs tothe field of chemical energy storage battery. The material has the chemical formula of wCeO2-Li[Ni<1-x-y-z>MnxCoyCez]O2, wherein 0.8 < 1-x-y-z < 1, 0 < x+y+z < 0.2, 0.005 <= w+z <= 0.03. Cerium nitrate and the NCM ternary cathode material are subjected to supersonic treatment in ethanol for 1-2 h and then are uniformly ground; the mixture is calcined at 500-750 DEG C for 4-6 h and then is cooled in the furnace. In the material, Ce<3+> can stabilize the layered framework of the NCM ternary cathode material for reducing mixed arrangement of Li<+> / Ni<2+> in the surface layer of the cathode material. By surface coating of the CeO2, an electrolyte / electrode interface structure is stabilized. The NCM ternary cathode material is significantly improved in rate capability and cycling stability.

Description

technical field [0001] The invention relates to a surface doped Ce 3+ And the surface layer is coated with CeO 2 The disclosed NCM ternary cathode material and a preparation method thereof belong to the field of chemical energy storage batteries. Background technique [0002] At present, fossil energy sources such as coal, oil, and natural gas are increasingly depleted. In addition, the problem of environmental pollution has gradually become the focus of attention of all countries. The development of pure electric vehicles and gasoline-gas hybrid vehicles has attracted more and more attention. This requires the rapid development of lithium secondary batteries to meet people's urgent needs for practical applications of new energy batteries. In the family of lithium secondary batteries, lithium cobalt oxide, lithium iron phosphate and ternary materials play an important role in the market in turn. Lithium cobalt oxide is mostly used in small portable electronic devices, wh...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525H01M4/48
CPCH01M4/366H01M4/48H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈来李晴苏岳锋吴锋卢赟包丽颖
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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