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Preparation method of strontium-improved nickel-cobalt-manganese ternary material

A ternary material, nickel-cobalt-manganese technology, used in electrical components, electrochemical generators, battery electrodes, etc., can solve the problem that the chemical composition of samples at room temperature is difficult to be consistent, the precipitation of nickel and cobalt ions is incomplete, and the precipitation conditions are quite different, etc. problem, to achieve the effect of excellent discharge performance, good consistency, and low cost of raw materials

Active Publication Date: 2018-01-12
FUJIAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest problem with this method is that the precipitation conditions of the hydroxide co-precipitation produced by nickel, cobalt and manganese are quite different. If the amount of alkali used in the precipitation process is insufficient, then the nickel and cobalt ions may not be completely precipitated; if the precipitation process If the amount of alkali used is too much, then the precipitated manganese ions may be dissolved, making it difficult for the prepared samples to have consistent chemical composition and performance at room temperature.
However, the actual improvement effect is not obvious at present

Method used

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  • Preparation method of strontium-improved nickel-cobalt-manganese ternary material
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  • Preparation method of strontium-improved nickel-cobalt-manganese ternary material

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Embodiment 1

[0048] Nickel acetate, cobalt acetate, manganese carbonate, lithium hydroxide and strontium oxide were weighed according to the molar ratio of nickel, cobalt, manganese, lithium, and doped strontium ions of 0.49:0.19:0.3:1.06:0.08. Mixture 1 was obtained by mixing nickel acetate, cobalt acetate, manganese carbonate and strontium oxide. Add 3 times the volume of deionized water of the total volume of mixture 1, and mix evenly; add ammonia water dropwise under continuous stirring until the acidity of the solution is pH 12.5, add weighed lithium hydroxide, mix evenly through a ball mill, and mix in a nitrogen atmosphere and aging at 85°C for 24 hours to obtain precursor 2. Precursor 2 was heated at 230° C. under a vacuum condition of 0.1 atmosphere to prepare dry precursor 3 . Precursor 3 was placed in an oxygen atmosphere, heated from room temperature to 850 °C at a rate of 5 °C / min, and cooled to room temperature to prepare a layered α-NaFeO 2 Structural, strontium-modified n...

Embodiment 2

[0051] Nickel oxide, cobalt nitrate, manganese acetate, lithium nitrate and strontium oxide were weighed according to the molar ratio of nickel, cobalt, manganese, lithium, and doped strontium ions: 0.47:0.17:0.30:1.01:0.07. Mixture 1 was obtained by mixing nickel oxide, cobalt nitrate, manganese acetate and strontium oxide. Add 1 times the volume of deionized water to the total volume of mixture 1, and mix well. Under the condition of continuous stirring, ammonia water was added dropwise to the acidity pH of the solution to 13.5, and the weighed lithium citrate was added, mixed evenly by sand milling equipment, and aged in an argon atmosphere at 60°C for 48 hours to prepare precursor 2. Precursor 2 was spray-dried at 120 °C to prepare dry precursor 3. Precursor 3 was placed in an oxygen atmosphere, heated from room temperature to 880 °C at a rate of 10 °C / min, and cooled to room temperature to prepare a layered α-NaFeO 2 Structural, strontium-modified nickel-cobalt-manganes...

Embodiment 3

[0054] Nickel nitrate, cobalt carbonate, manganese hydroxide, lithium nitrate and strontium nitrate were respectively weighed according to the molar ratio of nickel, cobalt, manganese, lithium, and doped strontium ions of 0.52:0.19:0.19:0.98:0.08. Mixture 1 was obtained by mixing nickel nitrate, cobalt carbonate, manganese hydroxide and strontium nitrate. Add 80 times the volume of deionized water of the total volume of the mixture 1, mix well, add ammonia water dropwise under continuous stirring until the acidity of the solution is pH 10.5, add the weighed lithium nitrate, mix uniformly by a ball mill, and mix in a helium atmosphere and Precursor 2 was obtained by aging at 90° C. for 48 hours. Precursor 2 was heated at 120° C. under a vacuum condition of 0.9 atmospheric pressure to prepare dry precursor 3 . Precursor 3 was placed in an oxygen atmosphere, heated from room temperature to 880 °C at a rate of 0.1 °C / min, and cooled to room temperature to prepare a layered α-NaFe...

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Abstract

The invention relates to a preparation method of a strontium-improved nickel-cobalt-manganese ternary material. The preparation method is characterized in that the strontium ion compound is strontiumoxide, strontium chloride, strontium nitrate, strontium hydroxide or strontium carbonate. The preparation method comprises the following steps: mixing a nickel compound, a cobalt compound, a manganesecompound and a strontium ion compound according to a molar ratio, and carrying out wet grinding, ammonium hydroxide addition, lithium addition, ageing, drying to prepare a dry precursor; putting thedry precursor into an oxygen atmosphere, and adopting a programmed temperature method or a gradual temperature area warming method to prepare the strontium-improved nickel-cobalt-manganese ternary material. The ternary material prepared in the invention has diffraction peaks, on an XRD diffraction pattern, which are identical with characteristic diffraction peaks of a layered alpha-NaFeO2 structure of JCPDS card 09-0063, the area, of which the 2 Theta is 20 to 25 degrees, of the XRD diffraction pattern of the sample is free of weak diffraction peak, and ternary material is free of the characteristic of diffraction peaks generated by Li2MnO3 diffraction corresponding to JCPDS card 27-1252.

Description

technical field [0001] The invention belongs to the technical field of battery electrode material preparation, and relates to a preparation method of a nickel-cobalt-manganese ternary material that can be used in lithium batteries, lithium ion batteries, polymer batteries and supercapacitors and has been improved by strontium. technical background [0002] With the depletion of fossil energy, energy issues have increasingly become a focus of attention. Finding new materials for energy storage has become one of the research hotspots. The lithium-ion battery of the new energy storage system should have the advantages of high voltage, large capacity, no memory effect and long life, and can be widely used in digital products such as mobile phones, digital cameras, notebook computers, and power tools such as electric vehicles and hybrid electric vehicles . [0003] Lithium-ion batteries include positive electrode materials, negative electrode materials, separators, electrolytes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M10/05H01M10/052H01M10/0525H01G11/30H01G11/46
CPCY02E60/10
Inventor 童庆松曾观音翁景峥马莎莎余欣瑞李秀华
Owner FUJIAN NORMAL UNIV
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