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Anion-cation co-doped NCM811 type high-nickel ternary material as well as preparation and application thereof

A high-nickel ternary material, anion and cation technology, used in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of poor cycle performance of high-nickel ternary materials, and improve structural stability and use safety. The effect of lifting, structural stability improvement

Inactive Publication Date: 2021-09-21
GUIZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an anion-cation co-doped NCM811 high-nickel ternary material and its preparation and application, which solves the problem of poor cycle performance of existing high-nickel ternary materials and improves the stability of the material structure. Reduce Li + / Ni 2 + Mixed row, to ensure the specific capacity, increase a certain lithium ion transmission rate

Method used

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  • Anion-cation co-doped NCM811 type high-nickel ternary material as well as preparation and application thereof
  • Anion-cation co-doped NCM811 type high-nickel ternary material as well as preparation and application thereof
  • Anion-cation co-doped NCM811 type high-nickel ternary material as well as preparation and application thereof

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Experimental program
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Effect test

Embodiment 1

[0019] An anion-cation co-doped NCM811 type high-nickel ternary material, the preparation method of which is as follows:

[0020] (1) Dissolve lithium fluoride in a mortar with appropriate deionized water (make sure to dissolve lithium fluoride), and then add 1g of precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 , and add 20mL of absolute ethanol for grinding to make the doping uniform;

[0021] (2) Add magnesium hydroxide and LiOH·H 2 0 is ground, and the absolute ethanol of 20mL is added in the grinding process, until grinding until the absolute alcohol is completely volatilized;

[0022] (3) Transfer the fully ground sample in step (2) to a corundum porcelain boat, and put it in a blast drying oven for 12 hours at 80°C;

[0023] (4) Put the dried sample into the tube furnace for sintering along with the corundum porcelain boat, introduce oxygen to ensure the complete oxidation of the material during the sintering process, keep it at 480°C for 5h, then raise the temperature to 75...

experiment example 1

[0025] Experimental example 1 Morphological characteristics

[0026] Such as figure 1 Shown is the SEM image of the undoped and anion-cation co-doped NCM811 high-nickel ternary material of the present invention, in which a is the undoped NCM811 high-nickel ternary material, and b is Example 1 of the present invention The anion-cation co-doped NCM811-type high-nickel ternary material prepared from figure 1 It can be seen that the basic structure of NCM811 is not changed after doping with anions and cations in the present invention, but the spherical particles are more compact.

experiment example 2

[0027] Experimental Example 2 Performance Test

[0028] Mix and grind 0.08g of NCM811 high-nickel ternary material, 0.01g of acetylene black and 0.01g of polyvinylidene fluoride into a slurry, evenly coat it on aluminum foil, and dry it in a vacuum oven at 110°C to obtain an electrode sheet , a button cell was assembled in a glove box using lithium metal as a counter electrode.

[0029] The charge-discharge and cycle tests were carried out on the blue electric test system, and the results are as follows:

[0030] Such as figure 2 Shown, is the cycle performance result (FM-NCM: the NCM811 type high nickel ternary material of anion and cation co-doping; NCM: not Doped NCM811-type high-nickel ternary material), at 3.0-4.5V, 0.5C long cycle, the capacity retention rate of 100 cycles is improved from 76.643% to 84.445%. Such as image 3 Shown is the charge and discharge diagram of the NCM811 high-nickel ternary material co-doped with anions and cations prepared in Example 1 o...

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Abstract

,The invention discloses an anion-cation co-doped NCM811 type high-nickel ternary material as well as preparation and application thereof. The material takes Ni0.8Co0.1Mn0.1(OH)2 as a precursor, and is doped with fluorine and magnesium elements, wherein a molar ratio of Mg to F to Ni to Co to Mn is 0.03:0.03:8:1:1. According to the anion-cation co-doped NCM811 type high-nickel ternary material, the fluorine element and the magnesium element enter the material in the sintering process, fluorine element doping is for oxygen site substitution, magnesium element doping is for transition metal site substitution, and the co-doping of the Mg element and the F element improves the stability of the battery material and ensures the high capacity of the battery material.

Description

technical field [0001] The invention relates to a high-nickel ternary material, in particular to an anion-cation co-doped NCM811 high-nickel ternary material and its preparation and application. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices, electric vehicles, etc. With people's increasing requirements for environmental protection, safe and stable power supply and the development of electric vehicles, lithium-ion batteries, which are green, environmentally friendly and high-energy, have been more widely used. The improvement of battery performance mainly depends on the improvement of the performance of the electrode materials and electrolyte materials that make up the battery, and the cathode material is a key component of lithium-ion batteries. The choice of cathode materials largely determines the performance and price of lithium-ion batteries. High-nickel ternary cathode materials have the advantages of high discharge ...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 徐本军薛鑫黄彩娟
Owner GUIZHOU UNIV
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