Composite coating modified high-nickel NCA positive electrode material and preparation method thereof

A positive electrode material and coating technology, applied in the field of composite coating modified high-nickel NCA positive electrode material and its preparation, can solve the problems of low capacity and poor cycle performance of positive electrode materials, and achieve the solution of cycle performance degradation, increase capacity, The effect of improving capacity and cycle performance

Active Publication Date: 2021-09-07
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the technical defects of the prior art, the present invention provides a composite coated and modified NCA positive electrode material and its preparation method to solve the problems of low capacity and poor cycle performance of NCA positive electrode materials

Method used

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  • Composite coating modified high-nickel NCA positive electrode material and preparation method thereof
  • Composite coating modified high-nickel NCA positive electrode material and preparation method thereof
  • Composite coating modified high-nickel NCA positive electrode material and preparation method thereof

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Effect test

Embodiment 1

[0034] A composite coating modified high-nickel NCA positive electrode material. The NCA positive electrode material uses nickel-cobalt lithium aluminate as a matrix, and a composite coating modification layer is wrapped on the surface of the substrate. The composite coating modification layer is made of LiCoO 2 with Co 2 o 3 Composition, the content of the composite coating modified layer is 1.0wt% of the total weight of the matrix. LiCoO in composite coating modified layer 2 with Co 2 o 3 The molar ratio is 1:1.5.

[0035] The chemical formula of lithium nickel cobalt aluminate is Li 1.01 Ni 0.913 co 0.069 al 0.015 Ti 0.003 o 2 .

[0036] The method for preparing the above-mentioned NCA cathode material comprises the following steps:

[0037] S1. Preparation of precursors:

[0038] According to the condition of the molar ratio of Ni:Co 93:7, nickel sulfate solution and cobalt sulfate solution are mixed as raw materials, the metal molar concentration of the nicke...

Embodiment 2

[0047] A composite coating modified high-nickel NCA positive electrode material. The NCA positive electrode material uses nickel cobalt lithium manganese oxide as a matrix, and a composite coating modification layer is wrapped on the surface of the substrate. The composite coating modification layer is made of LiCoO 2 with Co 2 o 3 Composition, the content of the composite coating modification layer is 1.0wt% of the total weight of the matrix. LiCoO in composite coating modified layer 2 with Co 2 o 3 The molar ratio is 1:2.

[0048] The chemical formula of lithium nickel cobalt manganese oxide is Li 1.01 Ni 0.913 co 0.069 al 0.015 Ti 0.003 o 2 .

[0049] The method for preparing the above-mentioned NCA cathode material comprises the following steps:

[0050] S1. Preparation of precursors:

[0051] Under the condition of the molar ratio of Ni:Co 93:7, nickel nitrate solution and cobalt sulfate solution are mixed as raw materials, the metal molar concentration of th...

Embodiment 3

[0058] A composite coating modified high-nickel NCA positive electrode material. The NCA positive electrode material uses nickel-cobalt lithium aluminate as a matrix, and a composite coating modification layer is wrapped on the surface of the substrate. The composite coating modification layer is made of LiCoO 2 with Co 2 o 3 Composition, the content of the composite coating modified layer is 0.6wt% of the total weight of the matrix. LiCoO in composite coating modified layer 2 with Co 2 o 3 The molar ratio is 1:1.

[0059] The chemical formula of lithium nickel cobalt aluminate is Li 1.05 Ni 0.923 co 0.049 al 0.026 Y 0.002 o 2 .

[0060] The method for preparing the above-mentioned NCA cathode material comprises the following steps:

[0061] S1. Preparation of precursors:

[0062] Under the condition of the molar ratio of Ni:Co 95:5, the nickel nitrate solution and the cobalt chloride solution are mixed as raw materials, the metal molar concentration of the nickel...

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Abstract

The invention provides a composite coating modified high-nickel NCA positive electrode material and a preparation method thereof. The NCA positive electrode material takes a ternary material as a matrix, and the surface of the matrix is coated with a composite coating modified layer composed of LiCoO2 and Co2O3. The preparation method comprises the following steps of: carrying out a co-precipitation reaction on a nickel salt solution, a cobalt salt solution, a sodium hydroxide solution and an ammonia water solution to obtain a nickel-cobalt hydroxide precursor; well mixing the obtained nickel-cobalt hydroxide precursor with a lithium source and an M source, then sintering in an oxygen atmosphere, then cooling to room temperature, crushing and sieving to obtain a primary sintered matrix; and mixing the obtained primary sintered matrix with deionized water, adding a cobalt source, adjusting the pH value, then filtering, drying, placing the matrix in an oxygen atmosphere for repeated heating and cooling sintering, cooling after sintering, and sieving to obtain the composite coating modified high-nickel NCA positive electrode material. The obtained NCA positive electrode material is high in capacity and good in cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a compound coated and modified high-nickel NCA cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, relatively stable discharge voltage, no memory effect, wide operating temperature range, no pollution, long cycle life, and good safety performance. Since their inception, they have been used in various power-consuming equipment middle. In recent years, lithium-ion batteries have also been widely used in electric vehicles, electric bicycles and other electric tools. However, with the upgrading of electric tools, higher requirements have been put forward for lithium-ion battery capacity, service life and safety performance. Therefore, the current research and development of lithium-ion batteries is mainly divided into two directions: one is to gradua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/525H01M10/0525
CPCH01M4/628H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 蔡振勇李艳邹强
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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