Wet-method zirconium-doped concentration-gradient nickel-cobalt-aluminum ternary precursor and preparation method thereof

A concentration gradient and precursor technology, applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve problems such as difficult to achieve homogenization, and achieve the effects of good processing performance, stable performance, and high capacity

Active Publication Date: 2019-08-16
ZHUJI PAWA NEW ENERGY
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Problems solved by technology

The industrialized preparation of nickel-cobalt-aluminum ternary positive electrode materials adopts solid-phase doping of aluminum elements. Generally, nickel-cobalt or nickel-cobalt-mangane

Method used

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  • Wet-method zirconium-doped concentration-gradient nickel-cobalt-aluminum ternary precursor and preparation method thereof
  • Wet-method zirconium-doped concentration-gradient nickel-cobalt-aluminum ternary precursor and preparation method thereof
  • Wet-method zirconium-doped concentration-gradient nickel-cobalt-aluminum ternary precursor and preparation method thereof

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preparation example Construction

[0029] The embodiment of the preparation method of the nickel-cobalt-aluminum ternary precursor with a concentration gradient doped with zirconium in the present invention comprises the following steps:

[0030]Step 1: Prepare a nickel-cobalt soluble salt solution with a total concentration of 2.0mol / L according to the molar ratio of Ni:Co 0.80:0.15. The zirconium salt is a 0.3% zirconium sulfate solution of the total mass of nickel-cobalt hydroxide. Mix the dissolved salt solution with the zirconium salt solution, prepare an aqueous sodium hydroxide solution with a concentration of 8 mol / L, prepare an aqueous ammonia solution with a concentration of 10 mol / L, and prepare a sodium metaaluminate solution with a concentration of 0.6 mol / L; sodium metaaluminate solution It is obtained by dissolving solid aluminum sulfate in excess sodium hydroxide solution.

[0031] Step 2: Add the mother liquor with ammonia concentration of 0.15mol / L and pH=11.78 into the 6500L reaction kettle e...

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Abstract

The invention discloses a wet-method zirconium-doped concentration-gradient nickel-cobalt-aluminum ternary precursor and a preparation method thereof. The nickel-cobalt-aluminum ternary precursor hasa chemical general formula of NixCoyAlz(OH)2, wherein x+y+z=1, 0.3<=x<=0.9, 0.01<=y<=0.4, and 0.01<=z<=0.4; the Zr element accounts for 0.001%-3% of the total mass of the nickel-cobalt hydroxide precursor, the ternary precursor consists of three layers, and the inner layer is a zirconium-doped nickel-cobalt binary precursor with a molecular formula of NixCoy(OH)2; and the outer layer is a zirconium-doped nickel-cobalt-aluminum ternary precursor with a molecular formula of NixCoyAlz(OH)2, and the intermediate layer is a concentration-gradient precursor between the zirconium-doped nickel-cobaltbinary precursor and the zirconium-doped nickel-cobalt-aluminum ternary precursor. The invention also includes the method for preparing the nickel-cobalt-aluminum ternary precursor. The zirconium-doped nickel-cobalt-aluminum ternary precursor has a narrow particle size distribution and good particle morphology, the doped element is distributed uniformly through complex controlled crystallizing co-precipitation, and a positive-electrode precursor prepared from the zirconium-doped nickel-cobalt-aluminum ternary precursor has high specific capacity, good cycling stability, good processability andstable performance.

Description

technical field [0001] The invention relates to the technical field of manufacturing a zirconium-doped concentration gradient nickel-cobalt-aluminum ternary precursor, in particular to a wet-process zirconium-doped concentration gradient nickel-cobalt-aluminum ternary precursor and a preparation method thereof. Background technique [0002] As a new type of green battery, lithium-ion batteries have many advantages such as high voltage, specific energy, and low environmental pollution. They have been widely used in the field of digital products, and are gradually expanding to the fields of electric vehicles, satellites, and aerospace. High energy and high density are the development direction of lithium-ion power batteries in the future. As an important material that affects the performance of lithium-ion power batteries, the research and development of positive electrode precursors has become the focus of the industry. [0003] Lithium-ion power batteries have high requireme...

Claims

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Application Information

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IPC IPC(8): C01G53/00
CPCC01G53/006C01P2004/01C01P2004/61C01P2006/40
Inventor 张宝王振宇
Owner ZHUJI PAWA NEW ENERGY
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