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Preparation method of FeNiP/C@MXene composite negative electrode material for lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as limitations, volume expansion, and low Coulombic efficiency, and achieve improved stability, extended battery life, and strong cycle performance. Effect

Active Publication Date: 2021-04-09
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of material will have obvious volume expansion during the energy storage process, and the first Coulombic efficiency is low. The above problems limit the application of metal phosphides as negative electrode materials.

Method used

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  • Preparation method of FeNiP/C@MXene composite negative electrode material for lithium ion battery
  • Preparation method of FeNiP/C@MXene composite negative electrode material for lithium ion battery

Examples

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Embodiment 1

[0030] A method for preparing a FeNiP / C@MXene composite negative electrode material for lithium-ion batteries, the specific steps are as follows:

[0031] (1) Weigh 10 mg of ammonium ferrous sulfate and 42 mg of nickel acetylacetonate and dissolve them in 50 ml of ethanol, stir with strong magnetic force for 1 hour, then add the mixed solution until 90 mg of sodium polystyrene sulfonate and 100 mg of trimesis are dissolved. A solution of formic acid in 25ml of N,N-dimethylformamide was stirred with strong magnetic force for 2 hours, and the solution was put into a high-pressure reactor, reacted at 120°C, and kept at a constant temperature for 24 hours.

[0032] (2) Rinse the product in step (1) three times with ethanol, then centrifuge, and then vacuum-dry at 70°C for 12 hours to obtain a mixed metal-organic framework template Fe / Ni-MOF. The template is a porous hollow structure with a specific surface area of ​​270.1 m 2 / g.

[0033] (3) 50mg of Fe / Ni-MOF and 1mg of few-lay...

Embodiment 2

[0038] A method for preparing a FeNiP / C@MXene composite negative electrode material for lithium-ion batteries, the specific steps are as follows:

[0039](1) Weigh 35 mg of ammonium ferrous sulfate and 81 mg of nickel acetylacetonate and dissolve them in 50 ml of ethanol, stir with strong magnetic force for 2 hours, then add the mixed solution until 121 mg of sodium polystyrene sulfonate and 48 mg of cyclohexane disulfide are dissolved. A solution of formic acid in 50ml of N,N-dimethylformamide was stirred with strong magnetic force for 1.2h, and the solution was put into an autoclave, reacted at 150°C, and kept at a constant temperature for 36h.

[0040] (2) Rinse the product in step (1) three times with ethanol, then centrifuge, and then vacuum-dry at 70°C for 12 hours to obtain a mixed metal-organic framework template Fe / Ni-MOF. The template is a porous hollow structure with a specific surface area of ​​220.1 m 2 / g.

[0041] (3) Combine 50mg of Fe / Ni-MOF with 2mg of few-...

Embodiment 3

[0045] A method for preparing a FeNiP / C@MXene composite negative electrode material for lithium-ion batteries, the specific steps are as follows:

[0046] (1) Weigh 40 mg of ammonium ferrous sulfate and 20 mg of nickel acetylacetonate and dissolve them in 50 ml of ethanol, stir for 2.5 hours with strong magnetic force, then add the mixed solution until 80 mg of sodium dodecylsulfonate and 30 mg of p-benzene In a solution of dicarboxylic acid in 200ml of N,N-dimethylformamide, stir with strong magnetic force for 3h, put the solution into an autoclave, react at 170°C, and keep the temperature constant for 20h.

[0047] (2) Rinse the product in step (1) three times with ethanol, then centrifuge, and then vacuum-dry at 100°C for 8 hours to obtain a mixed metal-organic framework template Fe / Ni-MOF. The template is a porous hollow structure with a specific surface area of ​​151.6 m 2 / g.

[0048] (3) Combine 50mg of Fe / Ni-MOF with 5mg few-layer Mo 2 C mixed and stirred, aged for ...

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Abstract

The invention discloses a preparation method of a FeNiP / C@ MXene composite negative electrode material for a lithium ion battery. The method comprises the following steps: dissolving nickel acetylacetonate and ammonium ferrous sulfate in ethanol, adding the solution into a solution of N, N-dimethylformamide dissolved with a surfactant and an organic ligand, strongly and magnetically stirring, and transferring the solution into a high-pressure reaction kettle for reacting; carrying out centrifugal separation and vacuum drying to obtain a mixed metal organic framework template; mixing and stirring a template and a pretreated MXene material, and centrifuging to obtain a Fe / Ni-MOF@ MXene precursor; and phosphating and calcining the precursor in a protective atmosphere to obtain the FeNiP / C@ MXene composite material. According to the invention, phosphide is crystallized and nucleated in MOF, the hollow carbon shell provides a sufficient space for the volume change of the internal phosphide, and the MXene at the outermost layer can limit the side reaction of the electrolyte and the phosphide so that initial coulombic efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of material synthesis and energy, and in particular relates to a method for preparing a FeNiP / C@MXene composite material for a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, and no memory. They have been widely used in digital, energy storage, electric vehicles and other fields, and have become the most promising high-energy battery system. [0003] At present, commercial lithium-ion batteries mostly use graphite anode materials, but graphite materials have the disadvantage of low specific capacity, and its theoretical capacity is only 372mAh / g. Therefore, the development of new high-performance anode materials is the key to the development of next-generation high-energy-density lithium-ion batteries. Metal phosphides have the advantages of ultra-high reversible capacity, good electron transfer rate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5805H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 刘嘉铭王苏敏
Owner JIANGXI UNIV OF SCI & TECH
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