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Preparation method and application of LiNi<0.8>Co<0.2>O<2> material

A hydrothermal reaction and nickel salt technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of no electrochemical activity, difficult oxidation, etc., achieve good structural order, and improve electrochemical performance Effect

Inactive Publication Date: 2018-06-22
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, LiNi 0.8 co 0.2 o 2 The preparation conditions of the material are relatively harsh, because the Ni 2+ Difficult to oxidize, according to the preparation of LiCoO 2 LiNi synthesized by the process 0.8 co 0.2 o 2 Almost no electrochemical activity, must contain O 2 react in an atmosphere

Method used

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  • Preparation method and application of LiNi&lt;0.8&gt;Co&lt;0.2&gt;O&lt;2&gt; material
  • Preparation method and application of LiNi&lt;0.8&gt;Co&lt;0.2&gt;O&lt;2&gt; material
  • Preparation method and application of LiNi&lt;0.8&gt;Co&lt;0.2&gt;O&lt;2&gt; material

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Embodiment 1

[0029] This embodiment provides a LiNi battery positive electrode 0.8 co 0.2 o 2 The preparation method of material, comprises the steps:

[0030] 1) Weigh 0.2551g of lithium acetate, 0.4977g of nickel acetate, 0.1246g of cobalt acetate and 0.3003g of urea into a 50mL beaker, add 40g of deionized water to obtain a mixed solution;

[0031] 2) ultrasonically stirring the mixed solution to completely dissolve all the materials to obtain a light yellow solution;

[0032] 3) Pour the solution into a 50mL hydrothermal reaction kettle, carry out solvothermal reaction in a forced air drying oven at 160°C, and naturally cool to room temperature after reacting for 10 hours;

[0033] 4) Transfer the precursor solution obtained by the hydrothermal reaction to a beaker, place the beaker in a water bath and heat and stir at a constant temperature of 80°C to remove the water in the solution;

[0034] 5) Put the beaker containing the dried product into a vacuum oven at 120°C for further d...

Embodiment 2

[0042] This embodiment provides a LiNi battery positive electrode 0.8 co 0.2 o 2 The preparation method of material, comprises the steps:

[0043] 1) Weigh 0.2551g of lithium acetate, 0.4977g of nickel acetate, 0.1246g of cobalt acetate and 0.3003g of urea into a 50mL beaker, add 40g of deionized water to obtain a mixed solution;

[0044] 2) ultrasonically stirring the mixed solution to completely dissolve all the materials to obtain a light yellow solution;

[0045] 3) Pour the solution into a 50mL hydrothermal reaction kettle, carry out solvothermal reaction in a forced air drying oven at 155°C, and naturally cool to room temperature after reacting for 12 hours;

[0046] 4) Transfer the precursor solution obtained by the hydrothermal reaction to a beaker, place the beaker in a water bath and heat and stir at a constant temperature of 80°C to remove the water in the solution;

[0047] 5) Put the beaker containing the dried product into a vacuum oven at 120°C for further d...

Embodiment 3

[0050] This embodiment provides a LiNi battery positive electrode 0.8 co 0.2 o 2 The preparation method of material, comprises the steps:

[0051] 1) Weigh 0.2551g of lithium acetate, 0.4977g of nickel acetate, 0.1246g of cobalt acetate and 0.3003g of urea into a 50mL beaker, add 40g of deionized water to obtain a mixed solution;

[0052] 2) ultrasonically stirring the mixed solution to completely dissolve all the materials to obtain a light yellow solution;

[0053] 3) Pour the solution into a 50mL hydrothermal reaction kettle, carry out solvothermal reaction in a forced air drying oven at 165°C, and naturally cool to room temperature after reacting for 8 hours;

[0054] 4) Transfer the precursor solution obtained by the hydrothermal reaction to a beaker, place the beaker in a water bath and heat and stir at a constant temperature of 80°C to remove the water in the solution;

[0055] 5) Put the beaker containing the dried product into a vacuum oven at 120°C for further dr...

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Abstract

The invention relates to a preparation method of a LiNi<0.8>Co<0.2>O<2> material. The preparation method comprises the following steps of (1) dissolving a lithium salt, a nickel salt, a cobalt salt and urea in water, and performing hydrothermal reaction under 160 DEG C to obtain a precursor solution, wherein the mole ratio of the lithium salt, the nickel salt and the cobalt salt is 1:0.8:0.2: and(2) drying the precursor solution to remove water, and performing calcination under 750-850 DEG C in an oxygen atmosphere to obtain the LiNi<0.8>Co<0.2>O<2> material. According to the method, a positive ion mixing phenomenon of the material during the synthesis process is effectively reduced by controlling structural morphology of a precursor product, the structural orderliness of the material isimproved, the structure collapse of the material during the circulation process can be reduced, and the cycle stability and the rate property of the battery are effectively improved.

Description

technical field [0001] The invention relates to the technical field of preparation of materials, in particular to a LiNi 0.8 co 0.2 o 2 Preparation methods of materials and their applications. Background technique [0002] One of the key technologies for the development of high-energy lithium-ion batteries is the development of cathode materials. In recent years, the research on negative electrode materials and electrolytes has made great progress. Relatively speaking, the development of positive electrode materials is relatively slow. The specific capacity of positive electrode materials in commercial lithium-ion batteries is much smaller than that of negative electrode materials, which has become a constraint for lithium ion batteries. An important factor to further improve the overall performance of the battery. Therefore, the research on cathode materials has received more and more attention. [0003] LiNi 0.8 co 0.2 o 2 Materials and LiCoO widely used today 2 T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525Y02E60/10
Inventor 贾宏亮高立军赵建庆
Owner SUZHOU UNIV
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