Method for preparing trivalent cation doped Ni-Co-Mn ternary material by direct precipitation

A technology of trivalent cations and ternary materials, which is applied in the field of battery electrode material preparation, can solve problems such as difficulty in consistent chemical composition of samples at room temperature, incomplete precipitation of nickel and cobalt ions, and large differences in precipitation conditions, achieving excellent discharge performance, The effect of good consistency and low raw material cost

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

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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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  • Method for preparing trivalent cation doped Ni-Co-Mn ternary material by direct precipitation
  • Method for preparing trivalent cation doped Ni-Co-Mn ternary material by direct precipitation
  • Method for preparing trivalent cation doped Ni-Co-Mn ternary material by direct precipitation

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Effect test

Embodiment 1

[0054] Nickel acetate, cobalt acetate, manganese carbonate, lithium oxide and aluminum oxide were respectively weighed according to the molar ratio of nickel, cobalt, manganese, lithium, and doped aluminum ions of 0.5:0.19:0.3:1:0.01. Mixture 1 is obtained by mixing nickel acetate, cobalt acetate, manganese carbonate and aluminum oxide. Add 5 times the volume of deionized water of the total volume of mixture 1 and mix well. Add ammonia water dropwise under continuous stirring until the acidity of the solution is pH 12.5, add weighed lithium oxide, mix evenly through a ball mill, and age for 24 hours in a nitrogen atmosphere at 70°C to prepare precursor 2. Precursor 2 was heated at 180° C. under a vacuum condition of 0.1 atmosphere to prepare dry precursor 3 . Precursor 3 was placed in oxygen-enriched air with an oxygen volume content of 75%, heated from room temperature to 950 °C at a rate of 5 °C / min, sintered at 950 °C for 12 hours, and cooled to room temperature to obtain ...

Embodiment 2

[0056] Nickel oxide, cobalt nitrate, manganese acetate, lithium citrate and vanadium trioxide were weighed according to the molar ratio of nickel, cobalt, manganese, lithium, and doped vanadium ions: 0.47:0.20:0.26:0.95:0.07. Mixture 1 was obtained by mixing nickel oxide, cobalt nitrate, manganese acetate and vanadium trioxide. Add 1 times the volume of distilled 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 13.0, 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 170 °C to prepare dry precursor 3. Precursor 3 was placed in oxygen-enriched air with an oxygen volume content of 99%, programmed heating from room temperature to 900 °C at a rate of 10 °C / min, and sintered at 900 °C for 3 hours, then cooled to room temperatu...

Embodiment 3

[0059] Nickel nitrate, cobalt acetate, manganese carbonate, lithium nitrate and scandium nitrate were respectively weighed according to the molar ratio of nickel, cobalt, manganese, lithium, and doped scandium ions of 0.52:0.10:0.35:1.10:0.03. Mixture 1 is obtained by mixing nickel nitrate, cobalt acetate, manganese carbonate and scandium nitrate. Add methanol 100 times the volume of the total volume of mixture 1, and mix well. Add ammonia water dropwise under continuous stirring until the acidity of the solution is pH 12.5, add weighed lithium nitrate, mix evenly through a ball mill, and age for 48 hours in a helium atmosphere at 90°C to prepare precursor 2. Precursor 2 was heated at 260° C. under a vacuum condition of 0.9 atmospheric pressure to prepare dry precursor 3 . Precursor 3 was placed in an oxygen-enriched air atmosphere with an oxygen volume content of 30%, heated from room temperature to 850 °C at a rate of 0.1 °C / min, sintered at 850 °C for 24 hours, and cooled ...

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Abstract

The invention relates to a method for preparing a trivalent cation doped Ni-Co-Mn ternary material by direct precipitation. The method is characterized in that the molar ratio x:y:z:k:m of Ni, Co, Mn,Li and doped trivalent M cation meets the condition that x:y:z:m is equal to (0.47-0.52):(0.10-0.20):(0.26-0.35):(0.01-0.10) or (0.57-0.62):(0.10-0.19):(0.15-0.25):(0.01-0.10), or (0.77-0.82):(0.05-0.10):(0.05-0.13):(0.01-0.10), wherein, k is not less than 0.95, and not more than 1.10, and the sum of x, y, z and m is 1. Weighed Ni, Co, Mn, Li and doped trivalent M cation are mixed with a wet-milling medium, ammonia liquor and a lithium compound are added, and the trivalent cation doped Ni-Co-Mn ternary material is prepared through steps of aging, drying, sintering and the like.

Description

technical field [0001] The invention belongs to the technical field of battery electrode material preparation, and relates to a method for direct precipitation of lithium batteries, lithium ion batteries, polymer batteries and supercapacitors to prepare nickel-cobalt-manganese ternary materials doped with trivalent cations. 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, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 童庆松彭建明李青海郑思宁马莎莎余欣瑞
Owner FUJIAN NORMAL UNIV
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