Molybdenum disulfide-coated lithium nickel cobalt manganate composite material, and preparation method and application thereof

A technology of nickel cobalt lithium manganate and composite materials, applied in the field of lithium ion batteries, can solve the problems of structural damage of positive electrode active materials, reduced capacity of main material, discount of coating effect, etc., to achieve electrochemical performance improvement, reduction of capacity loss, Easy to use effect

Inactive Publication Date: 2018-11-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect described in this patented technology relates to improving the properties of negative elec trodes for use in batteries or other applications that require fast charging/discharging rates without losing their ability to store energy due to reduced impedance caused by insulating materials on top.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to enhance the properties (such as lower costs) of high voltage Li-ions batteries while maintaining excellent electron conduction capabilities without compromizing other important factors like chemical safety and environmental impact concerns associated with traditional coatings made up mostly of ceramics.

Method used

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  • Molybdenum disulfide-coated lithium nickel cobalt manganate composite material, and preparation method and application thereof
  • Molybdenum disulfide-coated lithium nickel cobalt manganate composite material, and preparation method and application thereof
  • Molybdenum disulfide-coated lithium nickel cobalt manganate composite material, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0047] 0.325g ammonium tetrathiomolybdate ((NH 4 ) 2 MoS 4 ) was dissolved in 32.5g of absolute ethanol, heated and stirred in a water bath at 50°C for 10 minutes to obtain a dispersion; 0.8 co 0.1 mn 0.1 o 2 The ternary material obtains a mixed solution, keeps stirring in a 50°C water bath until the solvent dries up, then vacuum-dries the resulting product at 90°C to obtain a mixture, and sinters it at 400°C under an argon atmosphere for 6 hours to obtain LiNi 0.8 co 0.1 mn 0.1 o 2 @MoS 2 Composite materials, where MoS 2 The coating amount is 2wt%.

[0048] figure 1 Be LiNi in embodiment 1 0.8 co 0.1 mn 0.1 o 2 Ternary materials, and LiNi 0.8 co 0.1 mn 0.1 o 2 @MoS 2 Scanning and transmission electron microscopy images of the composite material; by figure 1 (a) and (b), it can be seen that the morphology of the material after modification basically does not change, and they are all spherical particles, indicating that the coating process will not damage t...

Embodiment 2

[0052] 0.65g ammonium tetrathiomolybdate ((NH 4 ) 2 MoS 4 ) was dissolved in 100g of ethylene glycol solvent, heated and stirred in a water bath at 60°C for 15 minutes to obtain a dispersion; 0.6 co 0.2 mn 0.2 o 2 For ternary materials, keep stirring in a water bath at 60°C until the solvent is completely evaporated, dry the resulting mixture in vacuum at 100°C, and then sinter at 450°C under an argon atmosphere for 8 hours to obtain molybdenum disulfide (MoS 2 ) surface modified LiNi 0.6 co 0.2 mn 0.2 o 2 @MoS 2 Composite materials, where MoS 2 The coating amount is 4wt%.

[0053] Figure 4 It is the cycle curve graph of positive electrode ternary material before and after modification under 1C current density, 25°C and 2.8-4.3V voltage range, which is determined by Figure 4 It can be seen that after the material before modification is cycled 100 times at 1C, the capacity of the material increases from 173.1mAh g -1 Rapidly decays to 143.9mAh·g -1 , the capaci...

Embodiment 3

[0055] 0.975g ammonium tetrathiomolybdate ((NH 4 ) 2 MoS 4 ) was dissolved in 50g ethanol solvent, heated and stirred in a water bath at 70°C for 20 minutes to obtain a dispersion; add (average particle size 11μm, 10g) LiNi 0.5 co 0.2 mn 0.3 o 2 For ternary materials, keep stirring in a water bath at 70°C until the solvent dries up, then vacuum-dry the resulting mixture at 120°C, and then sinter at 500°C under a nitrogen atmosphere for 10 hours to obtain molybdenum disulfide (MoS 2 ) surface modified LiNi 0.5 co 0.2 mn 0.3 o 2 @MoS 2 Composite materials, where MoS 2 The coating amount is 6wt%.

[0056] Figure 5 It is the cycle curve graph of positive electrode ternary material before and after modification under 1C current density, 25°C and 2.8-4.3V voltage range, which is determined by Figure 5 It can be seen that after the material before modification is cycled 100 times at 1C, the capacity of the material increases from 159.4mAh g -1 Rapidly decays to 129.6m...

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Abstract

The invention relates to a molybdenum disulfide-coated lithium nickel cobalt manganate composite material, and a preparation method and an application thereof, wherein the composite material is composed of a core material and a coating layer; the core material is lithium nickel cobalt manganate, and the chemical formula of the core material is LiNixCoyMn1-x-yO2, wherein x is greater than or equalto 0, and y is less than or equal to 1; and the coating layer is MoS2. The preparation method comprises the following steps of adding ammonium tetrathiomolybdate into a solvent, and performing stirring at 40-80 DEG C, so as to obtain a dispersion liquid; and adding lithium nickel cobalt manganate into the dispersion liquid to obtain a mixed solution, performing continuous stirring until the solvent is dried, and drying the product in a vacuum drying oven, and carrying out sintering on the mixture in a protective atmosphere to obtain the molybdenum disulfide-coated lithium nickel cobalt manganate composite material. The method is simple in preparation process, simple and convenient to operate and high in element utilization rate. When the composite material is applied to a lithium ion battery, characteristics of high primary coulombic efficiency, stable cycle performance and excellent rate performance are shown.

Description

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Claims

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Application Information

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Owner CENT SOUTH UNIV
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