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Nanostructured LiNbO3/graphene electrode material and preparation method thereof

A graphene electrode and nanostructure technology, applied in the direction of negative electrodes, structural parts, battery electrodes, etc., to achieve high rate characteristics, improve electrochemical performance, and shorten the effect of ion diffusion path

Pending Publication Date: 2019-10-25
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene is the most popular conductive carbon material today, which has the advantages of large specific surface area, strong mechanical properties and high conductivity, and LiNbO 3 Combining with graphene can give full play to the advantages of both, and obtain electrode materials with excellent electrochemical performance, but as far as we know, there is no report on LiNbO 3 Preparation of composite electrode materials with graphene and its application in energy storage devices

Method used

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  • Nanostructured LiNbO3/graphene electrode material and preparation method thereof
  • Nanostructured LiNbO3/graphene electrode material and preparation method thereof
  • Nanostructured LiNbO3/graphene electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] In the first step, 0.4 mmol of NbCl 5 Dissolve in ethanol, then mix with 5 uL / mL oleylamine ethanol solution, stir thoroughly for 30 min;

[0033] In the second step, the mixed solution of the first step is moved to a hydrothermal kettle, and reacted for 14 h at 180 °C;

[0034] In the third step, the product of the second step is separated, washed, dried, and heat-treated at 600 °C for 2 h under nitrogen to obtain Nb 2 o 5 nanoparticles;

[0035] The fourth step, the third step product Nb 2 o 5 Nanoparticles and Li 2CO 3 Mix and grind, the mass ratio of the two is 1:5, and calcined at 500 °C for 3 h under air to obtain LiNbO 3 nanoparticles;

[0036] The fifth step, the fourth step product LiNbO 3 Disperse 25 mg of nanoparticles into water, add 100 uL of silane coupling agent, and stir thoroughly for 24 h;

[0037] In the sixth step, the above mixed solution was added to a 0.5 mg / mL graphene oxide aqueous dispersion, and after being fully stirred for 2 h, it ...

Embodiment 2

[0041] In the first step, 0.1 mmol of NbCl 5 Dissolve in ethanol, then mix with 1 uL / mL oleylamine ethanol solution, stir thoroughly for 20 min;

[0042] In the second step, the mixed solution of the first step is moved to a hydrothermal kettle, and reacted for 20 h at 150 °C;

[0043] In the third step, the product of the second step is separated, washed, dried, and heat-treated at 600 °C for 1 h under nitrogen to obtain Nb 2 o 5 nanoparticles;

[0044] The fourth step, the third step product Nb 2 o 5 Nanoparticles and Li 2 CO 3 Mix and grind, the mass ratio of the two is 1:4, and calcined at 600 °C for 5 h under air to obtain LiNbO 3 nanoparticles;

[0045] The fifth step, the fourth step product LiNbO 3 Disperse 20 mg of nanoparticles into water, add 50 uL of silane coupling agent, and stir thoroughly for 12 h;

[0046] In the sixth step, the above mixed solution was added to a 0.2 mg / mL graphene oxide aqueous dispersion, stirred thoroughly for 1 h, separated, was...

Embodiment 3

[0050] In the first step, 0.6 mmol of NbCl 5 Dissolve in ethanol, then mix with 10 uL / mL oleylamine ethanol solution, stir thoroughly for 90 min;

[0051] In the second step, the mixed solution of the first step is moved to a hydrothermal kettle, and reacted for 24 h at 120 °C;

[0052] In the third step, the product of the second step is separated, washed, dried, and heat-treated at 600 °C for 3 h under nitrogen to obtain Nb 2 o 5 nanoparticles;

[0053] The fourth step, the third step product Nb 2 o 5 Nanoparticles and Li 2 CO 3 Mix and grind, the mass ratio of the two is 1:2, and calcined at 800 °C for 2 h in the air to obtain LiNbO 3 nanoparticles;

[0054] The fifth step, the fourth step product LiNbO 3 Disperse 100 mg of nanoparticles into water, add 200 uL of silane coupling agent, and stir thoroughly for 28 h;

[0055] In the sixth step, the above mixed solution was added to the 3 mg / mL graphene oxide aqueous dispersion, and after stirring for 5 h, it was sep...

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Abstract

The invention relates to a nanostructured LiNbO3 / graphene electrode material and a preparation method thereof. The preparation method includes the following steps: mixing NbCl5 as a raw material withoil amine, stirring the NbCl5 and the oil amine evenly and carrying out hydrothermal reaction, and carrying out heat treatment at high temperature to obtain Nb2O5 nanoparticles; mixing the Nb2O5 nanoparticles with Li2CO3, grinding the mixture, and calcining the mixture in air to obtain LiNbO3 nanoparticles; and finally, dispersing the LiNbO3 nanoparticles into water, adding a silane coupling agent, mixing the solution obtained with graphene oxide aqueous dispersion, obtaining LiNbO3 / graphene oxide after full stirring, and calcining the LiNbO3 / graphene oxide in air to obtain a final product, namely, the nanostructured LiNbO3 / graphene electrode material. The high-conductivity graphene and the uniformly distributed nanostructure LiNbO3 can shorten the diffusion paths of ions and electrons, make the electrolyte fully contact the electrode material and make the electrode material show high rate characteristic and outstanding cycle stability.

Description

technical field [0001] The invention belongs to the field of preparation of nano energy storage materials, in particular to a nanostructured LiNbO 3 The preparation method of / graphene electrode material. Background technique [0002] Lithium niobate (LiNbO 3 ), it was a very widely used optoelectronic material in the early days, and now some researchers are trying to make LiNbO 3 As an electrode material for energy storage devices, mainly due to LiNbO 3 with Li 4 Ti 5 o 12 have similar properties, where Nb 5+ / Nb 3+ The redox pair has a high operating voltage (1.7 V vs. Li + / Li), which can effectively prevent the formation of SEI layer and lithium dendrites, making energy storage devices with higher safety; LiNbO 3 In the process of electrochemical charge and discharge, the volume change is small, which promotes the reversibility of the lithium ion intercalation and extraction process; and LiNbO 3 has ratio Li 4 Ti 5 o 12 Higher theoretical capacity (363 mA hg ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525B82Y40/00
CPCH01M4/5825H01M4/625H01M10/0525B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 郝青丽焦新艳宋娟娟雷武丹尼尔·曼德勒
Owner NANJING UNIV OF SCI & TECH
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