Composite modification method for lithium ion battery positive electrode material

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as serious side reactions, poor structural stability, and air moisture sensitivity

Inactive Publication Date: 2018-06-08
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-nickel-based layered oxide cathode materials have attracted extensive attention due to their advantages such as high specific capacity, low price, and good environmental friendliness, but their poor cycle stability, thermal stability, and storage performance. Air moisture is sensitive, resulting in high processing requirements and greatly limiting its application
Most of these shortcomings are the essential properties of high-nickel-based layered oxide cathode materials, which bring great challenges to overcome them. In recent years, researchers have tried a variety of methods to try to achieve both high specific capacity and high stability. , and the advantages of easy processing
[0003] At present, the investment in research and development of high nickel-based layered oxide cathode materials has been greatly enhanced, among which NCM811 or NCA is the most representative, and also includes other materials such as NC two-component. The common characteristics of this series of materials include: 1) High Ni content , gene

Method used

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  • Composite modification method for lithium ion battery positive electrode material
  • Composite modification method for lithium ion battery positive electrode material
  • Composite modification method for lithium ion battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (1) Synthesis of high-nickel precursor Ni by co-precipitation technology 0.6 co 0.2 mn 0.2 (OH) 2 , after washing, drying or heat treatment, the Ni 0.6 co 0.2 mn 0.2 (OH) 2 Precursor products.

[0066] (2) The precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 The product and the lithium source are thoroughly mixed, wherein the molar ratio of lithium:transition metal (Ni, Co, Mn) is 1.05.

[0067] (3) Raise the fully mixed precursor substance to 900°C at 1.5°C / min in an oxygen atmosphere, and keep it for 15h to obtain the untreated matrix high-nickel cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 .

[0068] (4) the source material TiO of the material to be coated 2 , the coating auxiliary agent ethylene glycol is dispersed in ethanol and fully dissolved, wherein, the coating amount is 0.2-0.5wt.%, the mass ratio of the coating material and the solvent is 1:100, and the matrix material LiNi 0.6 co 0.2 mn 0.2 o 2 After being added into the dispersion system, stirred a...

Embodiment 2

[0076] (1) Synthesis of high-nickel precursor Ni by co-precipitation technology 0.6 co 0.2 mn 0.2 (OH) 2 , after washing, drying or heat treatment, the Ni 0.6 co 0.2 mn 0.2 (OH) 2 Precursor products.

[0077] (2) The precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 The product and the lithium source are thoroughly mixed, wherein the molar ratio of lithium:transition metal (Ni, Co, Mn) is 1.05.

[0078] (3) Raise the fully mixed precursor substance to 900°C at 1.5°C / min in an oxygen atmosphere, and keep it for 15h to obtain the untreated matrix high-nickel cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 .

[0079] (4) The source material Al of the material to be coated 2 o 3 , the coating auxiliary agent ethylene glycol is dispersed in ethanol and fully dissolved, wherein, the coating amount is 0.2-0.5wt.%, the mass ratio of the coating material and the solvent is 1:100, and the matrix material LiNi 0.6 co 0.2 mn 0.2 o 2 After adding it into the dispersion system, stirrin...

Embodiment 3

[0085] (1) Synthesis of high-nickel precursor Ni by co-precipitation technology 0.8 co 0.1 mn 0.1 (OH) 2 , LiNi that can be used for sintering synthesis is obtained after washing, drying or heat treatment. 0.8 co 0.1 mn 0.1 o 2 precursor products.

[0086] (2) The precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 The product is fully mixed with lithium sources, wherein the molar ratio of lithium:transition metals (Ni, Co, Mn) is 1.05.

[0087] (3) Raise the fully mixed precursor material to 800°C at 1.5°C / min in an oxygen atmosphere, and keep it for 15h to obtain the untreated matrix high-nickel cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 .

[0088] (4) The source material aluminum isopropoxide of the material to be coated, and the coating auxiliary agent ethylene glycol are dispersed in ethanol and fully dissolved, wherein, Al 2 o 3 The coating amount is 0.2-0.5wt.%, the mass ratio of the coating material and the solvent is 1:100, and the matrix material LiNi 0.8 co 0....

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Abstract

The invention discloses a composite modification method for a positive electrode material. The method comprises the following steps: 1) removing impurities from a positive electrode material precursorto obtain a cleaned and impurity-removed positive electrode material precursor; 2) mixing the clean and impurity-removed positive electrode material precursor obtained in step 1) with a lithium source; 3) sintering the above obtained mixture to obtain a positive electrode material matrix; 4) dispersing and dissolving the source substance and the coating aid of a coating material in a solvent to obtain a dispersion system, adding the positive electrode material matrix obtained in step 3) to the dispersion system, performing stirring, then performing solid-liquid separation to obtain a coated solid substance, and finally performing heat treatment to obtain a material having a coating material layer; and 5) washing and drying the material obtained in step 4) to obtain a composite modified lithium ion battery positive electrode material. The high-nickel positive electrode material with a good stability is prepared through the method, and can be washed to effectively reduce residual alkaliwhile keeping the structure stable without causing deterioration of performances.

Description

technical field [0001] The invention relates to the field of lithium ion battery electrode materials (including positive electrode materials and negative electrode materials), in particular to a composite modification method for positive electrode materials, and in particular to a composite modification method for high-nickel positive electrode materials for lithium ion batteries. Background technique [0002] High-nickel-based layered oxide cathode materials have attracted extensive attention due to their advantages such as high specific capacity, low price, and good environmental friendliness, but their poor cycle stability, thermal stability, and storage performance. Air moisture is sensitive, resulting in high processing requirements and greatly limiting its application. Most of these shortcomings are the essential properties of high-nickel-based layered oxide cathode materials, which bring great challenges to overcome them. In recent years, researchers have tried a vari...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 杨成陈超杨顺毅吴小珍黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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