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Preparation method of chromium-doped ternary material

A technology of ternary materials and positive electrode materials, which is applied in the manufacture of electrical components, hybrid/electric double layer capacitors, structural parts, etc., can solve the problems of difficult consistency of the chemical composition of samples at room temperature, incomplete precipitation of nickel and cobalt ions, and large differences in precipitation conditions Large and other problems, to achieve the effect of excellent discharge performance, good consistency, and low raw material cost

Active Publication Date: 2020-12-04
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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  • Preparation method of chromium-doped ternary material
  • Preparation method of chromium-doped ternary material
  • Preparation method of chromium-doped ternary material

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Weigh nickel acetate, cobalt acetate, manganese acetate, lithium hydroxide and Cr respectively according to the molar ratio of nickel, cobalt, manganese, lithium and chromium ions: 0.5:0.19:0.3:1:0.01 2 o 3 . Nickel acetate, cobalt acetate, manganese acetate and Cr 2 o 3 Mix to obtain mixture 1. Add 5 times the volume of deionized water of the total volume of mixture 1, add ammonia water dropwise under continuous stirring until the acidity of the solution is pH 12.5, add weighed lithium hydroxide, and age for 24 hours in a nitrogen atmosphere at 85°C , to prepare 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 Structured zirconium-doped ternary cathode material.

[0053] The ternary material satisfies the following character...

Embodiment 2

[0055] Weigh nickel oxide, cobalt nitrate, manganese oxide, lithium citrate and Cr(OH) respectively according to the molar ratio of nickel, cobalt, manganese, lithium and chromium ions: 0.49:0.12:0.30:0.97:0.06 3 . Nickel oxide, cobalt nitrate, manganese oxide and Cr(OH) 3 Mix to obtain mixture 1. Add 1 times the volume of distilled water of the total volume of the mixture 1, add ammonia water dropwise under the condition of continuous stirring until the acidity of the solution is pH 12.0, add the weighed lithium citrate, and age under an argon atmosphere at 65°C for 48 hours to prepare Precursor 2 was obtained. Precursor 2 was spray-dried at 260 °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 8 °C / min, and cooled to room temperature to prepare a layered α-NaFeO 2 Structured chromium-doped ternary cathode material.

[0056] The ternary material satisfies the following characteristics at the...

Embodiment 3

[0058] Weigh nickel nitrate, cobalt acetate, manganese oxide, lithium nitrate and Cr(OH) respectively according to the molar ratio of nickel, cobalt, manganese, lithium and chromium ions: 0.51:0.19:0.30:1.08:0.08 3 . Nickel nitrate, cobalt acetate, manganese oxide and Cr(OH) 3 Mix to obtain mixture 1. Add methanol 20 times the volume of the total volume of mixture 1, add ammonia water dropwise under continuous stirring until the acidity of the solution is pH 9.5, add weighed lithium nitrate, and age for 38 hours in a helium atmosphere at 90°C to prepare Precursor 2 was obtained. 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 atmosphere, heated from room temperature to 800 °C at a rate of 0.1 °C / min, and cooled to room temperature to prepare a layered α-NaFeO 2 Structured chromium-doped ternary cathode material.

[0059] The ternary material satisfies the following char...

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Abstract

The invention relates to a method for preparing a chromium-doped ternary material. The method is characterized in that a chromium compound is Cr2O3, Cr(OH)3, Cr(NO3)3 or CrCl3, or a mixture of chromate or bichromate and a reducing agent and strong acid. According to the invention, nickel, cobalt, manganese and an ion-doped compound are mixed according to a mol ratio, through steps of wet grinding,ammoniacal liquor addition, lithium compound addition, aging, and drying, and a dried predecessor is prepared. The dried predecessor is placed in oxygen atmosphere, and the ternary material is prepared by a program heating method or a temperature gradual-heating method. The method has the advantages of low cost of raw material, wide raw material source, simple preparation technology, simple operation, and less time consuming. Compared with a coprecipitation method, the sewage discharged during a preparation process is obviously reduced, a prepared sample does not have a LiMn6 superlattice structure, and the prepared electrode material has the advantages of good consistency, uniform composition, and excellent discharge performance.

Description

technical field [0001] The invention belongs to the technical field of battery electrode material preparation, and relates to a method for preparing a nickel-cobalt-manganese ternary material that can be used for lithium batteries, lithium ion batteries, polymer batteries and supercapacitor chromium-doped ternary materials. [0002] technical background [0003] 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 . [0004] Lithium-ion batteries include positive electrode materials, negative electrode materials, separators, electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01G11/86H01G11/46
CPCY02E60/10
Inventor 童庆松马莎莎陈方园朱德青余欣瑞生喻
Owner FUJIAN NORMAL UNIV
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