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Preparation method of spherical N-doped C-coated metal oxide negative electrode material with multi-stage structure

A negative electrode material and oxide technology, which is applied in the field of preparation of spherical N-doped C-coated metal oxide negative electrode materials, can solve the problems of material loss of activity, poor NiO cycle performance, poor conductivity, etc. Uniform, wide potential window reversible capacity, good dispersion effect

Active Publication Date: 2018-07-06
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cycle performance of NiO is not good
One is because it is a NiO semiconductor, which has poor conductivity.
The second is that the particles of NiO will be pulverized and agglomerated during the circulation process, resulting in the loss of activity of the material.

Method used

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  • Preparation method of spherical N-doped C-coated metal oxide negative electrode material with multi-stage structure
  • Preparation method of spherical N-doped C-coated metal oxide negative electrode material with multi-stage structure
  • Preparation method of spherical N-doped C-coated metal oxide negative electrode material with multi-stage structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 0.15g of polyvinylidene fluoride and 0.2g of guanidine hydrochloride in 2.85g of N-methylpyrrolidone, stir and mix, dry and calcinate, grind and pass through a fine sieve to obtain N-doped C powder. Dissolve sodium molybdate, nickel nitrate, ammonium fluoride and urea in a mixed solution of ethanol and water with a volume ratio of 1:3, stir for 1 hour, then transfer to a reaction kettle for 12 hours at 120°C, cool to room temperature, and filter , washed 4 times with a mixed solution of deionized water and ethanol, and dried at 60°C to obtain a precursor; then N-doped C powder was mixed with the precursor, ball milled, and put into a tube furnace in a nitrogen-argon gas mixture ( NiO / NiMoO 4 @N-C material. Will take 500mg of NiO / NiMoO obtained 4 @C material was put into 50mL distilled water, and ultrasonically dispersed for 2h, then 10mg sodium dodecylbenzenesulfonate was added as a surfactant, and stirred for 12h. Add 0.035mL pyrrole and 0.5mL1mol / L hydroch...

Embodiment 2

[0026]Dissolve 0.15g of polyvinylidene fluoride and 0.2g of guanidine hydrochloride in 2.85g of N-methylpyrrolidone, stir and mix, dry and calcinate, grind and pass through a fine sieve to obtain N-doped C powder. Dissolve sodium molybdate, nickel nitrate, ammonium fluoride and urea in a mixed solution of ethanol and water with a volume ratio of 1:3, stir for 1 hour, then transfer to a reaction kettle for 12 hours at 100°C, cool to room temperature, and filter , washed 4 times with a mixed solution of deionized water and ethanol, and dried at 60°C to obtain a precursor; then N-doped C powder was mixed with the precursor, ball milled, and put into a tube furnace in a nitrogen-argon gas mixture ( NiO / NiMoO 4 @N-C material. Will take 500mg of NiO / NiMoO obtained 4 The @N-C material was put into 50mL distilled water and ultrasonically dispersed for 2h, then 10mg sodium dodecylbenzenesulfonate was added as a surfactant, and stirred for 12h. Add 0.035mL pyrrole and 0.5mL1mol / L hyd...

Embodiment 3

[0028] Dissolve 0.15g of polyvinylidene fluoride and 0.2g of guanidine hydrochloride in 2.85g of N-methylpyrrolidone, stir and mix, dry and calcinate, grind and pass through a fine sieve to obtain N-doped C powder. Dissolve sodium molybdate, nickel nitrate, ammonium fluoride and urea in a mixed solution of ethanol and water with a volume ratio of 1:3, stir for 1 hour, then transfer to a reaction kettle for 8 hours at 160°C, cool to room temperature, and filter , washed 4 times with a mixed solution of deionized water and ethanol, and dried at 60°C to obtain a precursor; then N-doped C powder was mixed with the precursor, ball milled, and put into a tube furnace in a nitrogen-argon gas mixture ( NiO / NiMoO 4 @N-C material. Will take 500mg of NiO / NiMoO obtained 4 The @N-C material was put into 50mL of distilled water and ultrasonically dispersed for 2h, then 10mg of sodium dodecylbenzenesulfonate was added as a surfactant, and stirred for 12h. Add 0.035mL pyrrole and 0.5mL1mol...

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Abstract

The invention discloses a preparation method of a spherical N-doped C-coated metal oxide negative electrode material with a multi-stage structure and belongs to the field of lithium ion batteries. Thepreparation method comprises the following specific steps: mixing and stirring N-methylpyrrolidone, polyvinylidene fluoride and guanidine hydrochloride to transparent gel, drying to remove a solventand calcining in argon to obtain N-doped C; dissolving sodium molybdate, nickel nitrate, ammonium fluoride and urea in an alcohol solution, stirring into a homogeneous solution and performing hydrothermal reaction; then mixing the N-doped C and the homogeneous solution, ball-milling and calcining to obtain a NiO / NiMoO4@N-C material; putting the NiO / NiMoO4@N-C material in distilled water and addingsodium dodecyl sulfate after ultrasonic treatment; adding pyrrole and hydrochloric acid, stirring, then adding an initiating agent, centrifuging, washing and drying to obtain. The negative electrodematerial synthesized by the preparation method disclosed by the invention is uniform and consistent in particle, good in dispersibility and high in degree of crystallinity and has the stable multi-stage composite structure, thereby having appreciable wide potential window reversible capacity, excellent rate capability and stable cycle life.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a spherical N-doped C-coated metal oxide negative electrode material with a multi-level structure. Background technique: [0002] Lithium-ion batteries are widely used in industrial production, transportation, social life and other fields because of their advantages such as long service life, no memory effect, high energy density, low pollution, and high output voltage. In lithium-ion batteries, graphite-based carbon-based materials are used in the negative electrode materials of consumer industrial lithium battery products in the current market. However, the charge-discharge platform of carbon anode materials is relatively low and close to the reduction potential of lithium metal. During the use of the battery, with continuous charge and discharge, lithium ions are easy to deposit on the carbon anode to form needle-like lithium d...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 伊廷锋朱彦荣梅洁
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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