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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 uneven distribution of ternary material particles, unsuitable for industrial applications, difficult to control 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: 2021-09-28
CENT SOUTH UNIV
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  • Summary
  • 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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  • Preparation method of sodium and/or potassium doped high-nickel ternary positive electrode material
  • Preparation method of sodium and/or potassium doped high-nickel ternary positive electrode material
  • 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 preparation method of a sodium and / or potassium doped high-nickel ternary positive electrode material. The preparation method comprises the following steps: (1) dissolving a sodium source and / or a potassium source to obtain a solution A; and dissolving a high-nickel ternary precursor material in water, performing ultrasonic dispersion to form a solution B, gradually adding the solution A into the solution B, and stirring to form a mixed solution; (2) carrying out heating reaction on the mixed solution, cooling, filtering, washing and drying to obtain a doped high-nickel ternary precursor material; and (3) uniformly mixing the doped high-nickel ternary precursor material with a lithium source, sintering, and cooling to room temperature to obtain the sodium and / or potassium doped high-nickel ternary positive electrode material. Sodium and / or potassium are / is doped into the high-nickel ternary positive electrode material by adopting a solvothermal method, a doped material with a stable structure can be formed by adopting the doping mode, the morphology and the structure of the material are not influenced, and the completeness of secondary particles can be kept in the charge-discharge cycle process, so that the electrochemical performance of the high-nickel ternary material is improved.

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 Applications(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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