A kind of multiple modified nickel-rich ternary material and its preparation method and application

A ternary material, nickel-rich technology, applied in electrical components, structural parts, battery electrodes, etc., can solve the problems of bulk doping, easy structure collapse, poor coating effect, etc.

Active Publication Date: 2021-02-02
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems that the current NCM622 positive electrode material is easy to collapse in structure and the traditional bulk phase doping and coating effects are not good, the present invention provides a method for preparing a multiple modified nickel-rich ternary material

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  • A kind of multiple modified nickel-rich ternary material and its preparation method and application
  • A kind of multiple modified nickel-rich ternary material and its preparation method and application
  • A kind of multiple modified nickel-rich ternary material and its preparation method and application

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Embodiment 1

[0039] This embodiment provides a multiple modified nickel-rich ternary material, the preparation method of which is as follows:

[0040] Step a, add 0.5L of ammonia water with a concentration of 0.5mol / L in the reaction kettle as the reaction bottom liquid, and use ultrapure water to dilute nickel sulfate, cobalt sulfate, and manganese sulfate according to the molar ratio Ni:Co:Mn=6:2:2 Dissolve in a beaker to make 0.75L sulfate mixed solution, the sulfate concentration in the mixed solution is 1.5mol / L;

[0041] Step b, adding ferric sulfate and 1% lanthanum acetate equivalent to 1% of the total mass of nickel sulfate, cobalt sulfate, and manganese sulfate respectively to the sulfate mixed solution obtained in step a, to prepare a quinary mixed salt solution;

[0042] Step c, pump ammoniacal liquor, sodium hydroxide solution and the mixed solution of pentabasic sulfate obtained in step b into the co-precipitation reactor to obtain the mixed solution at a rate of 48ml / h, 104m...

Embodiment 2

[0046] This embodiment provides a multiple modified nickel-rich ternary material, the preparation method of which is as follows:

[0047] Step a, add 2L of ammonia water with a concentration of 0.4mol / L in the reaction kettle as the reaction bottom liquid, and use ultrapure water to dissolve nickel sulfate, cobalt sulfate, and manganese sulfate according to the molar ratio Ni:Co:Mn=5.5:1.8:1.8 In a beaker, make 2L sulfate mixed solution, the sulfate radical concentration in this mixed solution is 2mol / L;

[0048] Step b, adding ferric nitrate and 3% lanthanum nitrate equivalent to 3% of the total mass of nickel sulfate, cobalt sulfate, and manganese sulfate respectively to the sulfate mixed solution obtained in step a, to prepare a quinary mixed salt solution;

[0049] Step c, with the rate of 122.5ml / h, 333.3ml / h and 34.3ml / h respectively pump ammoniacal liquor, sodium hydroxide solution and step b gained pentabasic sulfate mixed solution into coprecipitation reactor and obta...

Embodiment 3

[0053] This embodiment provides a multiple modified nickel-rich ternary material, the preparation method of which is as follows:

[0054] Step a, add 1.3L of ammonia water with a concentration of 0.6mol / L in the reaction kettle as the reaction bottom liquid, and use ultrapure water to dilute nickel sulfate, cobalt sulfate, and manganese sulfate according to the molar ratio Ni:Co:Mn=6:2:2 Dissolve in a beaker to make 0.9L sulfate mixed solution, the sulfate concentration in the mixed solution is 2.5mol / L;

[0055] Step b, in step a gained sulfate mixed solution, add respectively iron sulfate, 3% ferric oxide, 2% lanthanum acetate and 3% lanthanum oxide equivalent to nickel sulfate, cobalt sulfate, manganese sulfate gross mass 2%, Prepare a quinary mixed salt solution;

[0056] Step c, with the rate of 48.9ml / h, 183.3ml / h and 12.2ml / h respectively pump ammoniacal liquor, sodium hydroxide solution and step b gained pentabasic sulfate mixed solution into coprecipitation reactor a...

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Abstract

The invention belongs to the technical field of battery materials, and in particular relates to a multi-modified nickel-rich ternary material and a preparation method and application thereof. The invention adopts the method of bulk doping and surface coating multiple modification, mainly through the co-doping modification of iron and lanthanum double ions to stabilize the structure of the NCM622 material, improve the ionic conductivity of the material, and reduce the weight of the NCM622 ternary material. In the cation mixing phenomenon during the cycle, the corrosion of the electrode material by the HF generated by the electrolyte is reduced by coating the conductive polymer modification, the side reaction generated at the interface is suppressed, and the best solid electrolyte interface film is formed, thereby improving the material's performance. Cycling performance and rate capability.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a multiple-modified nickel-rich ternary material and a preparation method and application thereof. Background technique [0002] Lithium-ion battery ternary materials are good cathode materials that can be used in electronic products due to their advantages such as good resistance to high voltage, high specific capacity, and low cobalt content. Ternary material nickel cobalt lithium manganese oxide Li(Ni x co y mn 1-x-y )O 2 Using nickel salt, cobalt salt, and manganese salt as raw materials, it is safer than lithium cobalt oxide batteries. Among them, the positive electrode ternary material LiNi 0.6 co 0.2 mn 0.12 o 2 (NCM622) lithium-ion power battery has the advantages of high energy density, good rate performance, excellent cycle performance, low price, long life, low energy consumption, no pollution, no memory effect, small self-discharge, small...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/60H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/602H01M10/0525Y02E60/10
Inventor 王波李文王秋君孙会兰张迪
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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