High-nickel positive electrode material with rock salt phase thin layer on primary particle surface layer and preparation method thereof

A positive electrode material and surface layer technology, applied in the field of high-nickel positive electrode materials and its preparation, can solve problems such as poor structure and thermal stability

Active Publication Date: 2020-10-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-nickel layered cathode materials are accompanied by significant phase transitions during cycling, eventually leading to poor structural and thermal stability

Method used

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  • High-nickel positive electrode material with rock salt phase thin layer on primary particle surface layer and preparation method thereof
  • High-nickel positive electrode material with rock salt phase thin layer on primary particle surface layer and preparation method thereof
  • High-nickel positive electrode material with rock salt phase thin layer on primary particle surface layer and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0042] (1) Weigh NiSO according to the ratio of Ni:Co=9:1 in molar ratio 4 ·6H 2 O and CoSO 4 ·7H 2 O, the total concentration of Ni and Co ions is 4mol L with deionized water -1 mixed salt solution, and then use deionized water to prepare NaOH and ammonia water in a molar ratio of 4:1 to make the NaOH concentration 0.2mol L -1 mixed alkaline solution.

[0043] (2) Add 100 mL of deionized water into the reaction kettle as the reaction base liquid, submerge the deionized water in the stirrer, and add ammonia water to adjust the pH to 11.0. The stirring speed was set to 550 r / min, and the reaction temperature was set to 55°C. Pump the mixed salt solution and mixed alkali solution into the reaction kettle slowly and uniformly, keep the pH stable at 11.0, and the feeding time is 24 hours. After the feeding, continue to pass argon gas and stir for 8 hours. After the reaction is completed, the precipitate is filtered, washed, and dried to obtain a nickel-cobalt positive electr...

Embodiment 2

[0052] (1) Weigh NiSO according to the ratio of Ni:Co=9:1 in molar ratio 4 ·6H 2 O and CoSO 4 ·7H 2 O, the total concentration of Ni and Co ions is 4mol L with deionized water -1 mixed salt solution, and then use deionized water to prepare NaOH and ammonia water in a molar ratio of 4:1 to make the NaOH concentration 0.2mol L -1 mixed alkaline solution.

[0053] (2) Add 100 mL of deionized water into the reaction kettle as the reaction base liquid, submerge the deionized water in the stirrer, and add ammonia water to adjust the pH to 11. The stirring speed was set to 600 r / min, and the reaction temperature was set to 55°C. Pump the mixed salt solution and mixed alkali solution into the reaction kettle slowly and uniformly, keep the pH stable at 11.0, and the feeding time is 24 hours. After the feeding, continue to pass argon gas and stir for 8 hours. After the reaction is completed, the precipitate is filtered, washed, and dried to obtain a nickel-cobalt positive electrod...

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Abstract

The invention relates to a high-nickel positive electrode material with a rock salt phase thin layer on a primary particle surface layer and a preparation method thereof, and belongs to the field of chemical energy storage batteries. The material takes a nickel-cobalt positive electrode material as a matrix, a metal element M is doped on the surface layer of the primary particles of the matrix, and the outermost layer of the surface layer of the primary particles of the material is a rock salt phase NiO thin layer. The method comprises the steps of mixing and stirring a nickel-cobalt positiveelectrode material precursor and a metal organic matter, and enabling the metal organic matter to gradually permeate into the material along the internal cracks of the secondary particles of the precursor in the stirring process and to be attached to the surface layers of the primary particles; and then calcining for the first time to fully mix the lithium salt with the precursor; and 2, calciningfor the second time to uniformly dope the high-valence metal elements attached to the surface layers of the primary particles into the surface layers of the primary particles to form the rock salt phase NiO thin layer on the surface layers of the primary particles. According to the present invention, the rock salt phase NiO thin layer can effectively isolate the direct contact between the material and the electrolyte, and inhibit the irreversible phase transformation of the material, thereby improving the cycling stability of the material.

Description

technical field [0001] The invention relates to a high-nickel positive electrode material with a rock-salt phase thin layer on the surface of primary particles and a preparation method thereof, belonging to the field of chemical energy storage batteries. Background technique [0002] The high-nickel layered cathode material is a very promising material, which is different from the traditional LiCoO 2 , LiNiO 2 and LiMnO 2 Compared with lithium-ion batteries, it has the advantages of high specific capacity, high energy density and environmental friendliness, so it gradually occupies an important position in the lithium-ion battery market. [0003] As the nickel content of the high-nickel layered cathode material increases, the specific capacity will increase accordingly, but the cycle stability will deteriorate. High-nickel layered cathode materials are accompanied by significant phase transitions during cycling, which eventually lead to poor structural and thermal stabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M4/62H01M10/0525C01F17/10C01F17/218C01F17/235C01G25/02C01G33/00C01G35/00C01G39/02C01G41/02C01G53/00C01G53/04B82Y40/00B82Y30/00
CPCH01M4/628H01M4/485H01M4/525H01M10/0525C01G53/42C01G53/04C01G33/00C01G25/02C01G39/02C01G41/02C01G35/00C01F17/235C01F17/218C01F17/10B82Y30/00B82Y40/00C01P2004/80C01P2002/72C01P2004/04C01P2006/40C01P2004/64Y02E60/10
Inventor 刘娜苏岳锋陈来卢赟李宁包丽颖黄擎陈实吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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