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Lithium vanadium phosphate/carbon heterogeneous mesoporous nanowire material and preparation method and application thereof

A lithium vanadium phosphate and nanowire technology, which is applied in the field of nanomaterials and electrochemistry, can solve problems such as hindering electrochemical reactions and poor conductivity, and achieve the effects of promoting marketization, high rate characteristics, and good dispersion

Active Publication Date: 2014-01-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its poor conductivity hinders the effective progress of electrochemical reactions. In recent years, nano-lithium vanadate materials have been widely studied as cathode materials for lithium-ion batteries, but lithium vanadium phosphate / carbon heterogeneous mesoporous nanowire materials are still There are few reports, and it is of great significance to synthesize high-performance lithium vanadium phosphate / carbon heterogeneous mesoporous nanowire electrode materials using simple, convenient, and low-cost methods

Method used

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  • Lithium vanadium phosphate/carbon heterogeneous mesoporous nanowire material and preparation method and application thereof

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Embodiment 1

[0040] Lithium vanadium phosphate / carbon heterogeneous mesoporous nanowire material preparation method, it comprises the following steps:

[0041] 1) Weigh out 2 mmoles of V 2 o 5 The powder was obtained as a suspension in deionized water;

[0042] 2) Add 6 mmol oxalic acid to the suspension obtained in step 1), and stir fully in a 70°C water bath until a clear solution is formed;

[0043] 3) Add a mixed solution of 3 mmol lithium carbonate and 6 mmol ammonium dihydrogen phosphate to the solution obtained in step 2), keep the water bath and continue stirring;

[0044] 4) Add 2 moles of cetyltrimethylammonium bromide into deionized water, and stir in a water bath at 80°C until it is fully dissolved to form a cetyltrimethylammonium bromide solution;

[0045] 5) Add the cetyltrimethylammonium bromide solution obtained in step 4) to the solution obtained in step 3), keep the water bath and continue stirring for 30 minutes;

[0046] 6) Transfer the solution obtained in step 5) ...

Embodiment 2

[0054] Lithium vanadium phosphate / carbon heterogeneous mesoporous nanowire material preparation method, it comprises the following steps:

[0055] 1) Weigh out 4 mmoles of V 2 o 5 The powder was obtained as a suspension in deionized water;

[0056] 2) Add 16 mmol oxalic acid to the suspension obtained in step 1), and stir fully in a 90°C water bath until a clear solution is formed;

[0057] 3) Add a mixed solution of 12 mmol lithium hydroxide and 12 mmol phosphoric acid to the solution obtained in step 2), keep the water bath and continue stirring;

[0058] 4) Add 8 moles of cetyltrimethylammonium bromide into deionized water, and stir in a water bath at 70°C until it is fully dissolved to form a cetyltrimethylammonium bromide solution;

[0059] 5) Add the cetyltrimethylammonium bromide solution obtained in step 4) to the solution obtained in step 3), keep the water bath and continue stirring for 60 minutes;

[0060] 6) Transfer the solution obtained in step 5) to the reac...

Embodiment 3

[0064] Lithium vanadium phosphate / carbon heterogeneous mesoporous nanowire material preparation method, it comprises the following steps:

[0065] 1) Weigh out 2 mmoles of V 2 o 5 The powder was obtained as a suspension in deionized water;

[0066] 2) Add 6 mmol oxalic acid to the suspension obtained in step 1), and stir fully in a 70°C water bath until a clear solution is formed;

[0067] 3) Add a mixed solution of 6 mmoles of lithium acetate and 6 mmoles of phosphoric acid to the solution obtained in step 2), keep the water bath and continue stirring;

[0068] 4) Add 2 moles of cetyltrimethylammonium bromide into deionized water, and stir in a water bath at 60°C until it is fully dissolved to form a cetyltrimethylammonium bromide solution;

[0069] 5) Add the cetyltrimethylammonium bromide solution obtained in step 4) to the solution obtained in step 3), keep the water bath and continue stirring for 60 minutes;

[0070] 6) Transfer the solution obtained in step 5) to the...

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Abstract

The invention relates to a lithium vanadium phosphate / carbon heterogeneous mesoporous nanowire material and a preparation method thereof. The lithium vanadium phosphate / carbon heterogeneous mesoporous nanowire material is formed by winding mesoporous nanowires in a bundle manner, wherein the diameter of single mesoporous nanowire is 50-200 nanometers, the length is 5-20 microns, and the pore diameter of the internal pore structure is 2-20 nanometers. The preparation method is characterized in that a self-assembly mechanism and follow-up calcination treatment are adopted so that the added surfactant is carbonized in situ to form the lithium vanadium phosphate / carbon heterogeneous mesoporous nanowire material, and a mesoporous hard template does not need to be added in advance; the lithium vanadium phosphate / carbon heterogeneous mesoporous nanowire material can be used as an anode active material of a long-life and high-power lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to a lithium vanadium phosphate / carbon heterogeneous mesoporous nanowire material and a preparation method thereof. The material can be used as a high-power and long-life lithium ion battery cathode active material. Background technique [0002] As a green electrochemical energy storage device, lithium-ion batteries are widely used in portable devices such as mobile phones and notebook computers, and are regarded as the best choice for power sources. Lithium-ion batteries have high energy density, but their low ion and electron transport rates lead to poor rate characteristics and low power density. Among them, the poor rate characteristics mean that the battery requires a long charging time and low output power, so the low power density limits the application of lithium-ion batteries in hybrid electric vehicles and pure electric vehicles; at t...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62B82Y30/00
CPCB82Y30/00H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 麦立强陈施谕魏湫龙陈丹丹
Owner WUHAN UNIV OF TECH
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