Preparation method of lithium manganate cladded high-nickel ternary lithium battery positive electrode material

A technology of ternary lithium battery and positive electrode material, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation process and control, high temperature instability, etc.

Inactive Publication Date: 2018-11-09
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the relatively complex preparation process and control of the current high-nickel positive electrode material, and the problem of high-temperature instability, the present invention proposes a method for preparing a high-nickel ternary lithium battery positive electrode material coated with lithium manganate

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of lithium manganate coated high nickel ternary lithium battery positive electrode material is characterized in that it comprises the following steps:

[0029] a. Prepare the NCM811 precursor into a slurry, dry, and grind to obtain NCM811 precursor powder; the NCM811 precursor slurry is prepared by the co-precipitation method, in which sodium carbonate is used as the precipitant, and the solution The pH value is 11.2, the aging is 3h, the drying temperature is 60°C, the drying time is 12h, and the grinding time is 20min;

[0030] b. Combine the NCM811 precursor powder obtained in step a with Mn 2 O 7 And Na 2 S 2 O 8 Dry ball milling is carried out under the protection of argon, the powder after ball milling is cleaned with absolute ethanol, and after vacuum drying, a lithium source is added for sintering to obtain lithium manganate coated NCM cathode material, NCM811 precursor powder, Mn 2 O 7 , Na 2 S 2 O 8 The mass ratio to lithium sulfate is 2:5:1:7, ...

Embodiment 2

[0033] A preparation method of lithium manganate coated high nickel ternary lithium battery positive electrode material is characterized in that it comprises the following steps:

[0034] a. Prepare the NCM811 precursor into a slurry, dry, and grind to obtain NCM811 precursor powder; the NCM811 precursor slurry is prepared by the co-precipitation method, in which sodium carbonate is used as the precipitant, and the solution The pH value is 11, aging for 5 hours, the drying temperature is 80°C, the drying time is 36 hours, and the grinding time is 30 minutes;

[0035] b. Combine the NCM811 precursor powder obtained in step a with Mn 2 O 7 And Na 2 S 2 O 8 Dry ball milling is carried out under the protection of argon, the powder after ball milling is cleaned with absolute ethanol, and after vacuum drying, a lithium source is added for sintering to obtain lithium manganate coated NCM cathode material, NCM811 precursor powder, Mn 2 O 7 , Na 2 S 2 O 8 The mass ratio to lithium sulfate is...

Embodiment 3

[0038] A preparation method of lithium manganate coated high nickel ternary lithium battery positive electrode material is characterized in that it comprises the following steps:

[0039] a. Prepare the NCM811 precursor into a slurry, dry, and grind to obtain NCM811 precursor powder; the NCM811 precursor slurry is prepared by the co-precipitation method, in which sodium carbonate is used as the precipitant, and the solution The pH value is 11.8, the aging is 4h, the drying temperature is 70°C, the drying time is 30h, and the grinding time is 50min;

[0040] b. Combine the NCM811 precursor powder obtained in step a with Mn 2 O 7 And Na 2 S 2 O 8 Dry ball milling is carried out under the protection of argon, the powder after ball milling is cleaned with absolute ethanol, and after vacuum drying, a lithium source is added for sintering to obtain lithium manganate coated NCM cathode material, NCM811 precursor powder, Mn 2 O 7 , Na 2 S 2 O 8 The mass ratio to lithium sulfate is 4:3:2:10,...

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Abstract

The invention belongs to the technical field of preparation of lithium batteries and in particular relates to a preparation method of a lithium manganate cladded high-nickel ternary lithium battery positive electrode material. The preparation method comprises the following steps: carrying out ball milling on an NCM811 precursor, Mn2O7 and Na2S2O8; oxidizing the NCM811 precursor into NCMOOH and covering the surface of the NCMOOH with MnO2 and Na2SO4 formed by reducing the Mn2O7; washing through absolute ethyl alcohol to remove the Na2SO4 and the Na2S2O8; absorbing water and acid in a decomposedproduct through the Mn2O7 and surface residual alkali respectively, so as to form an MnO2 cladded NCMOOH material; adding a lithium source and sintering to form a LiMn2O4 cladded NCM811(LiNi0.8Co0.1Mn0.1O2) positive electrode material. An oxide layer on the surface and the lithium source are combined to form a lithium manganate cladding layer, so that the capacity of lithium ions is improved andthe stability of an NCM material is improved.

Description

Technical field [0001] The invention belongs to the technical field of lithium battery preparation, and specifically relates to a preparation method of lithium manganate coated high nickel ternary lithium battery positive electrode material. Background technique [0002] Ternary materials (lithium nickel cobalt manganate) can greatly increase the specific capacity of the material by increasing the content of nickel, so high nickel ternary materials must be an ideal material for large batteries in the future. Currently, common lithium batteries mainly include ternary lithium, lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, etc., which are named according to the type of cathode material. [0003] Currently, the fully commercialized cathode materials mainly include lithium cobalt oxide, lithium iron phosphate, lithium manganate and ternary lithium. Among them, although lithium cobalt oxide has obvious advantages in energy density and other aspects, safety issue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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