Preparation method of spherical lithium nickel manganese oxide material with hollow porous micro-nano level structure

A micro-nano structure, lithium nickel manganese oxide technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of limited wide application, poor repeatability, low product volume, etc., to improve cycle performance, good rate performance and Cycle performance, effect of increasing contact area

Inactive Publication Date: 2016-07-06
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that these preparation methods have disadvantages such as complex process, poor repeatability, and low product yield, which limit their wide application.

Method used

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  • Preparation method of spherical lithium nickel manganese oxide material with hollow porous micro-nano level structure
  • Preparation method of spherical lithium nickel manganese oxide material with hollow porous micro-nano level structure
  • Preparation method of spherical lithium nickel manganese oxide material with hollow porous micro-nano level structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 0.9954g (0.004mol) nickel acetate (Ni(CH 3 COO) 2 4H 2 O), 2.9411g (0.012mol) manganese acetate (Mn(CH 3 COO) 2 4H 2 (0) and 1.9219g (0.032mol) urea were dissolved in the mixed solution of 80mL deionized water and ethylene glycol (volume ratio 5:1), and magnetic stirring made it dissolve completely for 30 minutes; In a 100mL high-pressure reactor lined with vinyl fluoride, seal it and place it in an oven for 8 hours at 170°C for 8 hours, then cool it down to room temperature naturally, wash, filter, and dry the resulting precipitate to obtain Ni 0.25 mn 0.75 CO 3 precursor, its SEM as figure 1 shown. Depend on figure 1 (a) It can be seen that the prepared precursors are all spherical particles with a uniform particle size, which is basically maintained at 1-2 μm; figure 1 (b) It can be seen that the surface of the precursor is denser.

[0033] The obtained precursor was pre-calcined in air at 500°C for 4 hours to obtain the oxide, and its SEM was as fol...

Embodiment 2

[0036] Weigh 0.4977g (0.002mol) nickel acetate (Ni(CH 3 COO) 2 4H 2 O), 1.4705g (0.006mol) manganese acetate (Mn(CH 3 COO) 2 4H 2 (0) and 0.8408g (0.014mol) urea were dissolved in the mixed solution of 80mL deionized water and ethylene glycol (volume ratio 3:1), and magnetic stirring made it dissolve completely for 30 minutes; In a 100mL high-pressure reactor lined with vinyl fluoride, seal it and place it in an oven at 180°C for 6 hours, then cool it down to room temperature naturally, wash, filter, and dry the resulting precipitate to obtain Ni 0.25 mn 0.75 CO 3 Precursor,

[0037] Pre-burn the obtained precursor in the air at 500°C for 4 hours to obtain the oxide, put it into absolute ethanol (the volume is 15 times the volume of the oxide), and then press Li:(Ni+Mn)=1.05: 2 (molar ratio) weigh 0.1552gLi 2 CO 3 Add it, put the mixed solution on a magnetic stirrer at 80°C while heating and stirring until the ethanol is completely volatilized, calcinate the obtained...

Embodiment 3

[0039] Weigh 0.7466g (0.003mol) nickel acetate (Ni(CH 3 COO) 2 4H 2 O), 2.2058g (0.009mol) manganese acetate (Mn(CH 3 COO) 2 4H 2 (0) and 1.6216g (0.027mol) urea were dissolved in the mixed solution of 80mL deionized water and ethylene glycol (volume ratio 2:1), and magnetic stirring made it dissolve completely for 30 minutes; In a 100mL high-pressure reactor lined with vinyl fluoride, seal it and place it in an oven for 4 hours at 190°C to react for 4 hours, then cool to room temperature naturally, wash, filter, and dry the resulting precipitate to obtain Ni 0.25 mn 0.75 CO 3 Precursor,

[0040] Pre-burn the obtained precursor in the air at 500°C for 4 hours to obtain the oxide, put it into absolute ethanol (the volume is 10 times the volume of the oxide), and then press Li:(Ni+Mn)=1.06: 2 (molar ratio) weigh 0.2350gLi 2 CO 3 Add it, put the mixed solution on a magnetic stirrer at 80°C while heating and stirring until the ethanol is completely volatilized, calcinate...

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Abstract

The invention provides a preparation method of a spherical lithium nickel manganese oxide material with a hollow porous micro-nano level structure. The method comprises the following steps: (1) dissolving a soluble nickel salt, a manganese salt and urea into a mixed solvent and stirring the mixture to obtain a mixed solution; (2) carrying out hydrothermal reaction at 150-190 DEG C for 4-12 hours and carrying out cooling, washing, filtering and drying to obtain an Ni0.25Mn0.75CO3 precursor; and (3) presintering the precursor in air at 450-550 DEG C, putting the product into absolute ethyl alcohol, adding a lithium source compound, heating and stirring until ethanol volatilization, calcining the product in air at 700-900 DEG C, and carrying out cooling to obtain the LiNi0.5Mn1.5O4 material. Any template agent does not need to be used; the spherical lithium nickel manganese oxide material with the hollow porous micro-nano level structure prepared through a simple kirkendall effect combines the advantages of nano primary particles, the porous structure and the hollow structure, and the rate capability and the cycle performance of the material can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing a spherical lithium nickel manganese oxide material with a hollow porous sub-micronano structure. Background technique [0002] At present, commercially applied lithium-ion battery cathode materials (such as LiCoO 2 , LiMn 2 o 4 、LiFePO 4 etc.) have relatively low energy densities, which cannot meet the application requirements for electric vehicles, hybrid electric vehicles, and large-scale energy storage systems. Therefore, improving the energy density of batteries has become an important problem and challenge faced by researchers and manufacturers of lithium-ion batteries. [0003] The energy density of the battery is determined by the specific capacity and working voltage of the battery. Considering issues such as safety, there is limited room for improving battery energy density by improving the assembly process. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 王丽吴伟王江峰梁广川
Owner HEBEI UNIV OF TECH
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