Carbene li 1-x na x fepo 4 Nanomaterials and their preparation methods and applications

A nanomaterial, carbene technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor ion diffusivity, low conductivity, and poor electrochemical performance

Active Publication Date: 2019-07-09
THE CHINESE UNIV OF HONG KONG SHENZHEN +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the divalent iron in the traditional lithium iron phosphate material is easily oxidized to ferric iron, and when it is used as the positive electrode of the ion battery, it is prone to disadvantages such as poor ion diffusivity and low conductivity, that is, poor electrochemical performance, which limits its wide application of

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  • Carbene li <sub>1-x</sub> na <sub>x</sub> fepo <sub>4</sub> Nanomaterials and their preparation methods and applications
  • Carbene li <sub>1-x</sub> na <sub>x</sub> fepo <sub>4</sub> Nanomaterials and their preparation methods and applications
  • Carbene li <sub>1-x</sub> na <sub>x</sub> fepo <sub>4</sub> Nanomaterials and their preparation methods and applications

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preparation example Construction

[0031] Carbene Li of one embodiment 1-x Na x FePO 4 The preparation method of the nanometer material comprises the following steps S110-S140.

[0032] S110, dissolving the lithium source compound, the sodium source compound, the iron source compound, the phosphorus source compound and the carbon source substance in water to form a mixed solution.

[0033] Specifically, the prepared mixed solution may be a solution or a suspension.

[0034]In one embodiment, the lithium source compound is selected from at least one of lithium chloride, lithium sulfate, lithium acetate, lithium nitrate, lithium carbonate, lithium hydroxide and lithium oxalate.

[0035] In one embodiment, the sodium lithium source compound is at least one selected from sodium chloride, sodium sulfate, sodium acetate, sodium nitrate, sodium carbonate, sodium hydroxide and sodium oxalate.

[0036] In one embodiment, the iron source compound is a ferrous salt. Ferrous ions increase ion diffusivity and conductiv...

Embodiment 1

[0067] Preparation of carbene Li 1-x Na x FePO 4 nanomaterials

[0068] Mix 0.4mol / L lithium chloride solution, 0.1mol / L sodium chloride solution, 0.5mol / L ferrous sulfate solution and 0.2mol / L carbon black, then add 0.5mol / L trisodium phosphate solution Mix to form a suspension and add it to an autoclave. Under the condition of 100° C., magnetically stir the reaction for 22 hours, then centrifuge at 2000 rpm for 10 minutes, filter, and wash with deionized water three times. The obtained solid was dried at a temperature of 45° C. to obtain a precursor. Carbon-based Li 1-x Na x FePO 4 rice powder. Carbon-based Li 1-x Na x FePO 4 The nanometer powder is mixed with 10% graphene oxide by mass, and a small amount of acetone is added to make a slurry. The slurry was fully ground by a ball mill for 20 h at room temperature under an argon atmosphere, and then fully dried at a temperature of 30 °C under vacuum to obtain the carbene Li 1- x Na x FePO 4 nanomaterials.

[...

Embodiment 2

[0075] Preparation of carbene Li 1-x Na x FePO 4 nanomaterials

[0076] Mix 0.6mol / L lithium nitrate solution, 0.1mol / L sodium sulfate solution, 1.0mol / L ferrous chloride solution and 0.1mol / L graphite, then add 1.0mol / L trisodium phosphate solution and mix, The resulting suspension was added to an autoclave, and reacted under magnetic stirring for 24 hours at 80° C., followed by centrifugation at 2000 rpm for 10 minutes, filtering, and washing with deionized water three times. The obtained solid was dried at a temperature of 60° C. to obtain a precursor. Carbon-based Li 1-x Na x FePO 4 rice powder. Carbon-based Li 1-x Na x FePO 4 The nanometer powder is mixed with 5% carbon nanotubes by mass, and a small amount of acetone is added to make a slurry. The slurry was fully ground by a ball mill for 20 h at room temperature under an argon atmosphere, and then fully dried at a temperature of 30 °C under vacuum to obtain the carbene Li 1-x Na x FePO 4 Nano powder.

[...

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Abstract

The invention relates to a carbene Li1-xNaxFePO4 nanomaterial and a preparation method and application thereof. The carbene Li1-xNaxFePO4 nanomaterial is prepared by: dissolving a lithium source compound, a sodium source compound, an iron source compound, a phosphorus source compound and a carbon source substance in water to obtain a mixed solution; drying the mixed solution to obtain a precursor;in the atmosphere of a protective gas, allowing the precursor to react under high temperature and protective gas to obtain carbon-based Li1-xNaxFePO4 nano powder; mixing the carbon-based Li1-xNaxFePO4 nano powder with a carbene compound; grinding and drying. The preparation method above is simple and has low cost, and the carbene Li1-xNaxFePO4 nanomaterial prepared has unique shape and large specific surface area, may act as a battery cathode material and has a promising application prospect in lithium-ion batteries or sodium-ion batteries.

Description

technical field [0001] The invention relates to the field of ion batteries, in particular to a carbene Li 1-x Na x FePO 4 Nanomaterials and their preparation methods and applications. Background technique [0002] Ion batteries are widely used in electronic products such as mobile phones and laptops, LiMn 2 o 4 , LiCoO 2 , LiNiO 2 and LiFePO 4 And its derivatives are considered to be used as positive electrode materials for large power ion batteries. Of which LiFePO 4 (Lithium iron phosphate) has an olivine structure, and has the advantages of abundant raw material sources, low cost, good safety, stable structure, easy synthesis, large reversible capacity, and excellent cycle performance. It is considered to be the most promising cathode material. [0003] However, the divalent iron in the traditional lithium iron phosphate material is easily oxidized to ferric iron, and when it is used as the positive electrode of the ion battery, it is prone to disadvantages such ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5825H01M4/62H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 朱熹邹志刚罗文俊周艳
Owner THE CHINESE UNIV OF HONG KONG SHENZHEN
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