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Ion doped and coated Ni-Co lithium manganate cathode material and preparation method thereof

A technology of nickel cobalt lithium manganate and cathode material, applied in the field of lithium ion batteries, can solve the problems of poor electrochemical performance, decay of electrochemical performance, slow electron conduction, etc., and achieves the advantages of improving rate performance, simplifying production process and saving costs. Effect

Inactive Publication Date: 2019-05-03
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, lithium nickel cobalt manganese oxide (LNCM) cathode material is widely used in 3C products and new energy vehicles due to its high energy density and relatively simple preparation process; however, in the cycle process, due to the The structure of the positive electrode material at the / electrolyte interface will change, and side reactions will occur between the positive electrode material and the electrolyte, which will cause electrochemical performance attenuation at the positive electrode / electrolyte interface of the nickel-cobalt lithium manganese oxide positive electrode material. ; In addition, due to the slow electron conduction of the existing nickel-cobalt lithium manganate cathode material, the electrochemical performance of the nickel-cobalt lithium manganese oxide cathode material at high rates is relatively poor

Method used

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Comparison scheme
Effect test

Embodiment 1

[0034] An ion-doped, coated nickel-cobalt lithium manganese oxide positive electrode material is characterized in that its general chemical formula is Li(Ni 0.37 co 0.3 mn 0.3 m 0.03 )O 2 @polymer, wherein, M is at least one of titanium, magnesium, aluminum, and zirconium, and polymer is a conductive polymer.

[0035] The embodiment of the present invention also provides a method for preparing the ion-doped and coated nickel-cobalt lithium manganese oxide positive electrode material as described in the above scheme, and the method is implemented by the following steps:

[0036] Step 1. Weigh 10 mol of nickel-cobalt-manganese precursor, 10.5 mol of lithium carbonate and 0.3 mol of titanium chloride, mix them evenly, and sinter at a constant temperature of 800°C for 8 hours in an oxygen atmosphere. After cooling, an ion-doped LNCM positive electrode material is obtained;

[0037] Step 2, disperse 1000g of ion-doped LNCM positive electrode material and 20g of polyaniline in N...

Embodiment 2

[0041] An ion-doped, coated nickel-cobalt lithium manganese oxide positive electrode material is characterized in that its general chemical formula is Li(Ni 0.34 co 0.33 mn 0.3 m 0.03 )O 2 @polymer, wherein, M is at least one of titanium, magnesium, aluminum, and zirconium, and polymer is a conductive polymer.

[0042] The embodiment of the present invention also provides a method for preparing the ion-doped and coated nickel-cobalt lithium manganese oxide positive electrode material as described in the above scheme, and the method is implemented by the following steps:

[0043] Step 1. Weigh 10 mol of nickel-cobalt-manganese precursor, 9.5 mol of lithium carbonate and 0.3 mol of titanium chloride, mix them evenly, and sinter at a constant temperature of 800°C for 8 hours in an oxygen atmosphere. After cooling, an ion-doped LNCM positive electrode material is obtained;

[0044] Step 2, disperse 1000g of ion-doped LNCM positive electrode material and 20g of polyaniline in N...

Embodiment 3

[0048] An ion-doped, coated nickel-cobalt lithium manganese oxide positive electrode material is characterized in that its general chemical formula is Li(Ni 0.34 co 0.3 mn 0.33 m 0.03 )O 2 @polymer, wherein, M is at least one of titanium, magnesium, aluminum, and zirconium, and polymer is a conductive polymer.

[0049] The embodiment of the present invention also provides a method for preparing the ion-doped and coated nickel-cobalt lithium manganese oxide positive electrode material as described in the above scheme, and the method is implemented by the following steps:

[0050] Step 1. Weigh 10 mol of nickel-cobalt-manganese precursor, 11.5 mol of lithium carbonate and 0.3 mol of titanium chloride, mix them evenly, and sinter at a constant temperature of 800°C for 8 hours in an oxygen atmosphere. After cooling, an ion-doped LNCM positive electrode material is obtained;

[0051] Step 2, disperse 1000g of ion-doped LNCM positive electrode material and 20g of polyaniline in ...

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Abstract

The invention discloses an ion doped and coated Ni-Co lithium manganate cathode material and a preparation method thereof. The chemical formula of the cathode material is Lib(NixCoyMnzMa)O2@polymer, wherein (x+y+z):b:a=1: (0.95 to 1.15): (0.01 to 0.05), x+y+z+a=1, x>0.33, M is at least one of titanium, magnesium, aluminum and zirconium, and polymer is a conductive polymer; Thus, by doping the Ni-Co lithium manganate cathode material with metal ions, the structural stability and the lithium ion conductivity of the material is improved, and the rate performance of the Ni-Co lithium manganate cathode material is improved. The coating of the conductive polymer isolates the Ni-Co lithium manganate cathode material from an electrolyte to avoid direct contact between the Ni-Co lithium manganate cathode material and the electrolyte, thereby improving the electrical conductivity of the material and accelerating the electron conduction while reducing side reactions.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an ion-doped and coated nickel-cobalt lithium manganate cathode material and a preparation method thereof. Background technique [0002] In the prior art, lithium nickel cobalt manganese oxide (LNCM) cathode material is widely used in 3C products and new energy vehicles due to its high energy density and relatively simple preparation process; however, in the cycle process, due to the The structure of the positive electrode material at the / electrolyte interface will change, and side reactions will occur between the positive electrode material and the electrolyte, which will cause electrochemical performance attenuation at the positive electrode / electrolyte interface of the nickel-cobalt lithium manganese oxide positive electrode material. ; In addition, due to the slow electron conduction of the existing nickel-cobalt lithium manganate cathode material, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 许开华叶建张云河
Owner JINGMEN GEM NEW MATERIAL