Nickel-cobalt-manganese ternary precursor, positive electrode material and preparation method

A nickel-cobalt-manganese ternary, precursor technology, applied in positive electrodes, chemical instruments and methods, nickel compounds, etc., can solve the problems of micro-cracks, reducing capacity retention rate, accumulation, etc.

Active Publication Date: 2022-03-25
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Single crystal positive electrode has good cycle stability, but defects still appear after charging to high voltage, these defects will continue to form and heal during charge and discharge, but still accumulate and cause microcracks, reducing capacity retention

Method used

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  • Nickel-cobalt-manganese ternary precursor, positive electrode material and preparation method
  • Nickel-cobalt-manganese ternary precursor, positive electrode material and preparation method
  • Nickel-cobalt-manganese ternary precursor, positive electrode material and preparation method

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Experimental program
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Effect test

Embodiment 1

[0036] The preparation of nickel-cobalt-manganese ternary precursor comprises the following steps:

[0037] (1) Prepare nickel-cobalt-manganese mixed salt solution according to the molar ratio of Ni:Co:Mn=80.80±0.5 : 9.59±0.3: 9.59±0.3. Prepare 24m 3 For the nickel-cobalt-manganese mixed salt solution with a total metal ion concentration of 120g / L, the volumes of qualified single-salt nickel sulfate, cobalt sulfate, and manganese sulfate solutions to be added are 10497L, 1341L, and 805L respectively, and the remaining volumes are supplemented with water.

[0038] (2) Preparation of zirconium salt and magnesium salt solution

[0039] Zr is added in the form of doping, and the doping amount is 4885ppm. Accurately prepare 500L, 0.1 mol / L Zr doping solution: weigh 50mol (27.36kg) of Zr(SO 4 ) 4 4H 2 O powder was dissolved in 500 L of water to prepare a 0.1 mol / L doped Zr solution. The zirconium salt solution used for doping and coating is the same concentration of zirconium ...

Embodiment 2

[0074] The preparation of nickel-cobalt-manganese ternary precursor comprises the following steps:

[0075] (1) According to the ratio of Ni:Co:Mn=96.93±0.5 : 1.53±0.3:1.53±0.3, a nickel-cobalt-manganese mixed salt solution with a total metal ion concentration of 121g / L was prepared. Prepare 24m 3 Qualified nickel-cobalt-manganese mixed salt solution, the volumes of qualified single-salt nickel sulfate, cobalt sulfate, and manganese sulfate solutions are 12531.03L, 212.90L, and 127.82L, respectively. The remaining volume was made up with water.

[0076] (2) Preparation of zirconium salt and magnesium salt solution

[0077] Zr is added in the form of doping, and the doping amount is 9726ppm. Accurately prepare 500L, 0.1 mol / L Zr doping solution: weigh 50mol (27.36kg) of Zr(SO 4 ) 4 4H 2 O powder was dissolved in 500 L of water to prepare a 0.1 mol / L doped Zr solution. The zirconium salt solution used for doping and coating is the same concentration solution.

[0078] Mg...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and discloses a zirconium-magnesium doping and zirconium coating double-modified nickel-cobalt-manganese ternary precursor and a preparation method thereof. According to the preparation method, Zr and Mg are introduced into the ternary precursor for doping, Zr is introduced for coating at the later stage of reaction, a complexing control crystallization coprecipitation method is adopted, and the zirconium-magnesium doping and zirconium coating dual-modified nickel-cobalt-manganese ternary precursor is prepared by controlling parameters such as the pH value, the ammonia concentration and the reaction temperature of a reaction system. According to the invention, Zr, Mg doping and Zr coating are introduced into the ternary precursor, the positive electrode material inheriting the performance is stable in cycle performance, good in capacity retention rate and excellent in rate performance, meanwhile, the single crystal material has the characteristics of compact internal structure and no crack, the volume effect and crack generation can be effectively inhibited in the fast charging process, and the development requirements of the electric vehicle industry can be met.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a nickel-cobalt-manganese ternary precursor, a positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion power batteries play an important role in the field of electric vehicles, but range anxiety and time-consuming charging pose technical obstacles to the popularization of electric vehicles. While increased battery capacity allows longer battery life, the increase in charging time counteracts customer expectations. Reducing charging times without sacrificing range could give a big boost to the adoption of electric vehicles. Fast charging has become a long-term strategic goal for the development of electric vehicles. At present, the main defect of fast charging is that in the state of high current charging, high current density will increase the concentration gradient of lithium ions and aggravate t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/525H01M4/505H01M10/0525H01M2004/028C01P2004/61C01P2006/12C01P2004/84C01P2004/03C01P2006/11
Inventor 张宝程磊张珂邓鹏林可博周亚楠邓梦轩
Owner ZHUJI PAWA NEW ENERGY
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