A kind of preparation method of sodium and/or potassium doped high-nickel ternary positive electrode material

A positive electrode material, potassium doping technology, applied in the field of preparation of high-nickel doped ternary positive electrode materials, can solve the problems of inapplicability to industrial applications, uneven distribution of ternary material particles, difficulty in controlling the crystal growth process, etc., to achieve reduction The generation of irreversible capacity, the improvement of electrochemical performance, and the effect of inhibiting the mixing of lithium and nickel

Active Publication Date: 2022-02-01
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because it is difficult to control the crystal growth process due to the mixing of multiple elements, the particle distribution of the obtained ternary material is uneven, and a variety of synthesis conditions need to be adjusted. This method is suitable for experimental process exploration, but not suitable for industrial applications.

Method used

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  • A kind of preparation method of sodium and/or potassium doped high-nickel ternary positive electrode material
  • A kind of preparation method of sodium and/or potassium doped high-nickel ternary positive electrode material
  • A kind of preparation method of sodium and/or potassium doped high-nickel ternary positive electrode material

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Embodiment 1

[0037] A method for preparing a sodium-doped high-nickel ternary positive electrode material, comprising the following steps:

[0038] (1) Weigh 0.0124g (0.310443mmol) NaOH and dissolve it in 20mL deionized water to form solution A; In water, ultrasonically disperse for 1 h to form solution B. Solution A was gradually added to solution B at a flow rate of 100 mL / h, and then stirred at 25 °C for 5 h to form a uniform mixed solution.

[0039] (2) Transfer the homogeneously mixed solution obtained in step (1) into a 100mL polytetrafluoroethylene reactor, then seal it with the corresponding steel shell of the reactor, put it in a blast oven, and heat it at 180°C After being kept at low temperature for 12 hours, it was cooled, filtered, washed, and dried to obtain a doped high-nickel ternary precursor material.

[0040] (3) After mixing 1 g of the doped high-nickel ternary precursor material obtained in step (2) with 0.4558 g (10.8655 mmol) of lithium hydroxide monohydrate, in a ...

Embodiment 2

[0046] A method for preparing a potassium-doped high-nickel ternary positive electrode material, comprising the following steps:

[0047] (1) Weigh 0.0174g (0.310443mmol) KOH and dissolve it in 20mL deionized water to form solution A; In water, ultrasonically disperse for 1.5h to form solution B. Solution A was gradually added to solution B at a flow rate of 120 mL / h, and then stirred at 25 °C for 4 h to form a uniform mixed solution.

[0048] (2) Transfer the homogeneously mixed solution obtained in step (1) into a 100mL polytetrafluoroethylene reactor, then seal it with the corresponding steel shell of the reactor, put it in a blast oven, and heat it at 180°C After being kept at the lower temperature for 14 hours, it was cooled, filtered, washed, and dried to obtain a doped high-nickel ternary precursor material.

[0049] (3) After mixing 1 g of the doped high-nickel ternary precursor material obtained in step (2) with 0.4427 g (10.555 mmol) of lithium hydroxide monohydrat...

Embodiment 3

[0055] A preparation method of a sodium- and potassium-doped high-nickel ternary positive electrode material, comprising the following steps:

[0056] (1) Dissolve 0.0062g (0.15522mmol) NaOH and 0.0087g (0.15522mmol) KOH in 20mL deionized water to form solution A; Mn1.042956mmol) was dissolved in 30mL deionized water, and ultrasonically dispersed for 2h to form solution B. Solution A was gradually added to solution B at a flow rate of 100 mL / h, and then stirred at 25 °C for 6 h to form a uniform mixed solution.

[0057] (2) Transfer the homogeneously mixed solution obtained in step (1) into a 100mL polytetrafluoroethylene reactor, then seal it with the corresponding steel shell of the reactor, put it in a blast oven, and heat it at 180°C After being kept at low temperature for 12 hours, it was cooled, filtered, washed, and dried to obtain a doped high-nickel ternary precursor material.

[0058] (3) After mixing 1g of the doped high-nickel ternary precursor material obtained ...

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Abstract

The invention discloses a method for preparing a sodium and / or potassium doped high-nickel ternary positive electrode material, comprising the following steps: (1) dissolving the sodium source and / or potassium source to obtain solution A; dissolving the high-nickel ternary precursor The material is dissolved in water, ultrasonically dispersed to form solution B, solution A is gradually added to solution B, and stirred to form a mixed solution; (2) The mixed solution is heated to react, cooled, filtered, washed, and dried to obtain a doped high-nickel ternary precursor (3) Mix the doped high-nickel ternary precursor material with the lithium source evenly, sinter, and cool to room temperature to obtain the sodium and / or potassium-doped high-nickel ternary positive electrode material. The present invention uses a solvothermal method to dope sodium and / or potassium into a high-nickel ternary positive electrode material. This doping method can form a doped material with a stable structure without affecting the morphology and structure of the material. The process can maintain the integrity of the secondary particles, thereby improving the electrochemical performance of high-nickel ternary materials.

Description

technical field [0001] The invention belongs to the field of battery materials, in particular to a preparation method of a high-nickel-doped ternary positive electrode material. Background technique [0002] The biggest disadvantage of high-nickel ternary cathode materials is poor structural stability and high-temperature performance, and the following phenomena are prone to occur on the surface particles: layered structure-spinel structure-inactive rock phase transition process, causing capacity, cycle performance attenuation. In order to solve this problem, ion doping and surface coating methods can be used to suppress material performance degradation. Doping is mainly to make the dopant ions enter the lattice structure, replace some ions in the raw material, and reduce the Li + / Ni 2+ The mixed row can stabilize the raw material structure, improve the stability of the material structure during the cycle, and improve the cycle of the material. [0003] The current dopi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M4/62
CPCC01G53/50H01M4/505H01M4/525H01M4/628C01P2002/72C01P2004/03C01P2006/40C01P2004/61C01P2004/32H01M2004/028Y02E60/10
Inventor 童汇毛高强郭学益姚渝王旭喻万景田庆华丁治英
Owner CENT SOUTH UNIV
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