Preparation method of three-dimensional conductive skeleton/metal nitride composite lithium metal negative electrode current collector

A metal anode and nitride technology, which is applied in the field of preparation of three-dimensional conductive framework/metal nitride composite lithium metal anode current collector, can solve problems such as poor practicability, and achieve the effects of good practicability, long cycle life and growth inhibition.

Pending Publication Date: 2020-04-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the shortcomings of the poor practicability of the existing lithium metal negative electrode current collector preparation methods, the p

Method used

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  • Preparation method of three-dimensional conductive skeleton/metal nitride composite lithium metal negative electrode current collector
  • Preparation method of three-dimensional conductive skeleton/metal nitride composite lithium metal negative electrode current collector
  • Preparation method of three-dimensional conductive skeleton/metal nitride composite lithium metal negative electrode current collector

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1:

[0029] (1) Cut 12mm thick commercial nickel foam into small pieces with a length of 4cm and a width of 2.5cm, followed by ultrasonic cleaning with 1.0mol / L dilute hydrochloric acid, absolute ethanol and deionized water to remove surface impurities, and vacuum drying for later use.

[0030] (2) Cobalt nitrate hexahydrate (CoNO 3 6H 2 O), ammonium fluoride (NH 4 F) and urea (CON 2 H 4 ) were dissolved in deionized water according to the molar concentration of 1.25mol / L, 0.25mol / L and 0.5mol / L respectively, and stirred for 2h.

[0031] (3) Transfer the mixed solution after stirring in step (2) to the polytetrafluoroethylene lining, and immerse the nickel foam obtained in step (1) into the mixed solution, and react at 120° C. for 8h in a hydrothermal kettle, Then cooled to room temperature, washed and dried to obtain a precursor of nickel foam (Co(OH)F / NF) composite modified by Co(OH)F nanobrush.

[0032](4) The composite precursor obtained in the step (...

Example Embodiment

[0033] Example 2:

[0034] (1) Cut 12mm thick commercial nickel foam into small pieces with a length of 4cm and a width of 2.5cm, followed by ultrasonic cleaning with 1.0mol / L dilute hydrochloric acid, absolute ethanol and deionized water to remove surface impurities, and vacuum drying for later use.

[0035] (2) Nickel nitrate hexahydrate (NiNO 3 6H 2 O), ammonium fluoride (NH 4 F) and urea (CON 2 H 4 ) were dissolved in deionized water according to the molar concentration ratios of 1.75mol / L, 0.25mol / L and 0.5mol / L respectively, and stirred for 3h.

[0036] (3) Transfer the mixed solution after stirring in step (2) to the polytetrafluoroethylene lining, and immerse the nickel foam obtained in step (1) into the mixed solution, and react in a hydrothermal kettle at 90° C. for 10 hours, Then cooled to room temperature, washed and dried to obtain a nickel foam (Ni(OH)F / NF) composite precursor modified by Ni(OH)F nanobrushes.

[0037] (4) Nitriding the composite precursor ...

Example Embodiment

[0038] Example 3:

[0039] (1) Cut 12mm thick commercial nickel foam into small pieces with a length of 4cm and a width of 2.5cm, followed by ultrasonic cleaning with 1.0mol / L dilute hydrochloric acid, absolute ethanol and deionized water to remove surface impurities, and vacuum drying for later use.

[0040] (2) Ferric chloride hexahydrate (FeCl 3 6H 2 O), ammonium fluoride (NH 4 F) and urea (CON 2 H 4 ) were dissolved in deionized water according to the molar concentration ratios of 2.5mol / L, 0.5mol / L and 1mol / L, and magnetically stirred for 4h.

[0041] (3) Transfer the mixed solution stirred in step (2) to the polytetrafluoroethylene lining, and immerse the nickel foam obtained in (1) into the mixed solution, react in a hydrothermal kettle at 180° C. for 5 h, and then Cooled to room temperature, washed and dried to obtain Fe(OH)F nanobrush modified nickel foam (Fe(OH)F / NF) composite precursor.

[0042] (4) The composite precursor obtained in the step (3) is subjecte...

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Abstract

The invention discloses a preparation method of a three-dimensional conductive skeleton/metal nitride composite lithium metal negative electrode current collector, which is used for solving the technical problem of poor practicability of the existing preparation method of the lithium metal negative electrode current collector. According to the technical scheme, a precursor with a specific nanostructure grows on a three-dimensional conductive skeleton by using a hydrothermal synthesis method, and the nitride-modified three-dimensional conductive skeleton current collector is obtained through high-temperature nitridation. The conversion reaction between the metal nitride and the lithium metal endows the three-dimensional skeleton with excellent lithium affinity, so that uniform deposition/stripping of lithium is induced, and meanwhile, the conductive skeleton with the spatial three-dimensional structure effectively alleviates the problem of volume expansion of the lithium metal in the circulation process. The synergistic effect of the two protects the stability of a solid electrolyte membrane and effectively inhibits the growth of lithium dendrites. The lithium metal negative electrode of the three-dimensional current collector prepared by the method has excellent coulombic efficiency, ultra-long cycle life, low voltage lag and good practicability.

Description

technical field [0001] The invention relates to a preparation method of a composite lithium metal negative electrode collector, in particular to a preparation method of a three-dimensional conductive framework / metal nitride composite lithium metal negative electrode collector. Background technique [0002] In recent years, with the rapid development of portable electronic devices, electric vehicles and energy storage grids, people's demand for energy density and power density of secondary lithium batteries is also increasing. However, commercial Li-ion batteries using graphite as the negative electrode are due to their low theoretical specific capacity (372mAh g -1 ), has been unable to meet the rapidly growing demand for energy density. Therefore, it is necessary to develop new anode materials with higher specific capacity. [0003] Due to its high theoretical specific capacity (3860mAh g-1), the lowest electrochemical potential (-3.04Vvs standard hydrogen electrode) and ...

Claims

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Application Information

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IPC IPC(8): H01M4/66
CPCH01M4/661H01M4/667Y02E60/10
Inventor 王建淦雷美娜
Owner NORTHWESTERN POLYTECHNICAL UNIV
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