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Preparation method of MXene-coated nickel-cobalt-manganese ternary positive electrode material

A cathode material, nickel-cobalt-manganese technology, which is applied in the field of preparation of MXene-coated nickel-cobalt-manganese ternary cathode materials, can solve the problems of decreased cycle stability and capacity.

Inactive Publication Date: 2021-01-01
宁波中材科拓新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are still some deficiencies in the cycle performance, rate performance and safety performance of ternary materials. The shortcomings are mainly due to the decrease in capacity caused by Li and Ni mixing and the decrease in cycle stability under high voltage.

Method used

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  • Preparation method of MXene-coated nickel-cobalt-manganese ternary positive electrode material
  • Preparation method of MXene-coated nickel-cobalt-manganese ternary positive electrode material
  • Preparation method of MXene-coated nickel-cobalt-manganese ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0027] S1. Preparation of coating liquid MXene: Disperse Ti3AlC2 (2g) and LiF (3g) in 40mL of 9M hydrochloric acid solution, stir in a polytetrafluoroethylene container at a constant temperature for 48h, centrifuge, wash with water until the pH is neutral, and centrifuge The mixture was dispersed in 500mL solution and subjected to ultrasonic treatment for 2h to obtain a negatively charged MXene dispersion.

[0028] S2. Cationic coating of NCM ternary electrode material: Disperse 1 g of NCM523 ternary electrode material and 0.5 g of PDDA (polydimethyldiallyl ammonium chloride) in 200 ml of absolute ethanol solution, heat and stir to make the solution completely Volatilize, grind the dried solid powder for later use, and obtain the PDDA-coated NCM523 ternary electrode material.

[0029] S3. The mass ratio of the MXene solid content and the PDDA-coated NCM523 ternary electrode material obtained in b is 5%, blended and stirred for 12 hours, centrifuged and washed three times, and ...

Embodiment example 2

[0032] S1. Preparation of the coating solution MXene The preparation is the same as in Example 1.

[0033] S2. Cationic coating of NCM ternary electrode material: Disperse 1 g of NCM523 ternary electrode material and 0.5 g of CTAB (cetyltrimethylammonium bromide) in 200 ml of absolute ethanol solution, heat and stir to completely volatilize the solution , and grind the dried solid powder for later use to obtain CTAB-coated NCM523 ternary electrode material.

[0034] S3. The mass ratio of MXene solid content and the CTAB-coated NCM523 ternary electrode material obtained in b is 5%, blended and stirred for 12 hours, centrifuged and washed three times, and freeze-dried. The dried product is the MXene-coated ternary positive electrode material.

[0035] Through electrostatic adsorption, a layer of dense MXene nanosheet structure is coated on the surface of the NCM523 ternary electrode material, which can realize the direct contact between the surface of the ternary electrode mater...

Embodiment example 3

[0037] S1. Preparation of the coating solution MXene The preparation is the same as in Example 1.

[0038] S2. Cationic coating of NCM ternary electrode material: Disperse 1 g of NCM523 ternary electrode material and 0.5 g of silane coupling agent KH550 in 200 ml of absolute ethanol solution, heat and stir to completely volatilize the solution, and grind the dried solid powder For standby, the silane-coated NCM523 ternary electrode material is obtained.

[0039] S3. Blend and stir for 12 hours the silane-coated NCM523 ternary electrode material with a mass ratio of 5% between the solid content of MXene and the silane-coated NCM523 ternary electrode material obtained in b, centrifuge, wash with water three times, freeze-dry, and the dried product is the MXene-coated ternary positive electrode material.

[0040] The MXene coated in this implementation case is evenly distributed on the surface of NCM523 without obvious agglomeration phenomenon, and its element distribution diagram ...

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Abstract

The invention relates to a preparation method of an MXene-coated nickel-cobalt-manganese ternary positive electrode material, which comprises the following steps: preparing an MXene dispersion liquid,namely preparing organ-shaped MXene from an MAX phase serving as a raw material by using an acid etching method, preparing the organ-shaped MXene into an MXene monolithic dispersion liquid by using an ultrasonic stripping method, and carrying out negative charge on the prepared MXene dispersion liquid based on oxygen-containing functional groups. The nickel-cobalt-manganese ternary positive electrode material is treated by using a cationic surfactant, so that the surface of the ternary positive electrode is positively charged, and the surface of the nickel-cobalt-manganese ternary positive electrode material is coated with an MXene sheet layer by using electrostatic adsorption self-assembly. Due to the existence of the MXene coating layer, the direct contact between the ternary positive electrode material and the electrolyte is effectively isolated, and the side reaction caused by the direct contact is effectively avoided. The preparation method disclosed by the invention is simple, short in flow, easy in step operation and excellent in material processability and electrochemical performance, the impedance of the battery is reduced, and the high-rate performance and the cycling stability of the material are improved.

Description

technical field [0001] The invention belongs to the technical field of nickel-cobalt-manganese ternary positive electrode materials for lithium-ion batteries, and in particular designs a preparation method for MXene-coated nickel-cobalt-manganese ternary positive electrode materials. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high working voltage, small self-discharge, no memory effect, and environmental friendliness. Electric motorcycles, electric vehicles, military equipment, aerospace and other fields. [0003] Layered Li-Ni-Co-Mn-O series materials (referred to as ternary materials) are currently one of the most promising cathode materials. This material has the advantages of high specific capacity, low price, good safety, and easy synthesis. It is currently the most common cathode material for commercial students. Compared with other positive electrode materials, ternary materials have the most advantages in co...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 孙志鹏齐方亚
Owner 宁波中材科拓新材料科技有限公司