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Carbon-decorated porous lithium vanadium phosphate nanosphere material as well as preparation method and application thereof

A technology of lithium vanadium phosphate and nanospheres, which is applied in the field of nanomaterials and electrochemistry, can solve problems such as complex preparation methods, electrochemical performance needs to be improved, and is not conducive to material industrialization, and achieves simple process, favorable for market promotion, and easy Amplified effect

Active Publication Date: 2014-11-05
皮玉强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrochemical performance of the material is relatively excellent at low current density, but when the current density is increased to 10C, the electrochemical performance of the material needs to be improved (only about 100mAh / g)
At the same time, the preparation method is relatively complicated, which is not conducive to the industrialization of materials

Method used

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  • Carbon-decorated porous lithium vanadium phosphate nanosphere material as well as preparation method and application thereof
  • Carbon-decorated porous lithium vanadium phosphate nanosphere material as well as preparation method and application thereof
  • Carbon-decorated porous lithium vanadium phosphate nanosphere material as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of carbon modified porous lithium vanadium phosphate nanosphere material, such as figure 1 As shown, it includes the following steps:

[0036] 1) 1.78 vanadium pentoxide (V 2 o 5 ) and 3.696g oxalic acid (C 2 h 2 o 4 ) into 40mL distilled water (V 2 o 5 The molar ratio of oxalic acid and oxalic acid is 1:3), mixed and stirred at 80°C for 10 minutes to obtain VOC 2 o 4 blue solution;

[0037] 2) Measure 85% phosphoric acid (H 3 PO 4 ) solution (2mL), phosphoric acid was dripped dropwise into the blue solution of step 1) gained, and stirred evenly;

[0038] 3) Weigh 3.142g of lithium acetate dihydrate (LiAc, the actual amount of lithium source is 1.05 times the required reaction amount) powder, dissolve it in 30mL of distilled water, and drop it into the blue solution obtained in step 2) after dissolving;

[0039] 4) Weigh 5mL of ethylene glycol with a molar ratio of 1:9.12 to vanadium pentoxide, add dropwise to the solution obtained in ...

Embodiment 2

[0050] 1) 1.78 vanadium pentoxide (V 2 o 5 ) and 3.696g oxalic acid (C 2 h 2 o 4 ) into 40mL distilled water (V 2 o 5 The molar ratio of oxalic acid and oxalic acid is 1:3), mixed and stirred at 80°C for 10 minutes to obtain VOC 2 o 4 blue solution;

[0051] 2) Weigh ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 3.38g, was dissolved in 10mL distilled water, and the solution was dripped dropwise into the blue solution obtained in step 1), and stirred evenly;

[0052] 3) Weigh 1.14g lithium carbonate (Li 2 CO 3 , the actual amount of lithium source is 1.05 times of the required reaction amount) powder, dissolved in 30mL of distilled water, and dropped into the blue solution obtained in step 2) after dissolving;

[0053] 4) Weigh 4.39 mL of ethylene glycol with a molar ratio of 1:8 to vanadium pentoxide, add dropwise to the solution obtained in step 3), and stir evenly;

[0054] 5) Weigh 3.93mL of ethylenediamine with a molar ratio of 1:6 to vanadium pentoxide, add...

Embodiment 3

[0060] 1) 1.78 vanadium pentoxide (V 2 o 5 ) and 3.696g oxalic acid (C 2 h 2 o 4 ) into 40mL distilled water (V 2o 5 The molar ratio of oxalic acid and oxalic acid is 1:3), mixed and stirred at 80°C for 10 minutes to obtain VOC 2 o 4 blue solution;

[0061] 2) Weigh ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 3.38g, was dissolved in 10mL distilled water, and the solution was dripped dropwise into the blue solution obtained in step 1), and stirred evenly;

[0062] 3) Weigh 2.13g lithium nitrate (LiNO 3 , the actual amount of lithium source is 1.05 times of the required reaction amount) powder, dissolved in 30mL of distilled water, and dropped into the blue solution obtained in step 2) after dissolving;

[0063] 4) Weigh 5.48 mL of ethylene glycol with a molar ratio of 1:10 to vanadium pentoxide, add dropwise to the solution obtained in step 3), and stir evenly;

[0064] 5) Weigh 5.89mL of ethylenediamine with a molar ratio of 1:9 to vanadium pentoxide, add dropw...

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Abstract

The invention discloses a carbon-decorated porous lithium vanadium phosphate nanosphere material as well as a preparation method and application thereof. Lithium vanadium phosphate particles coated with a carbon layer are connected with one another to form the carbon-decorated porous lithium vanadium phosphate nanosphere material which is characterized in that lithium vanadium phosphate particles are connected with one another by a three-dimensional carbon net, and the three-dimensional carbon net covers lithium vanadium phosphate. The preparation method comprises the following steps: adding a vanadium source, namely vanadium pentoxide, and oxalic acid into distilled water, and agitating until vanadium pentoxide and oxalic acid are dissolved; sequentially adding a phosphorus source, a lithium source, glycol and ethylenediamine; carrying out hydrothermal reaction on the materials to obtain a precursor solution; drying the precursor solution to obtain a red brown solid; and grinding, pre-sintering, grinding and calcining the solid to finally obtain the black three-dimensional carbon-decorated porous lithium vanadium phosphate nanosphere material. When being used as a positive active material of a lithium ion battery, the carbon-decorated porous lithium vanadium phosphate nanosphere material has the characteristics of high power and high cycling stability; the preparation process is simple, and the nanosphere material can be obtained by combining a hydrothermal method with a solid-state sintering method; the nanosphere material is high in feasibility and easy to amplify, meets the requirements of green chemistry, and is suitable for market popularization.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to carbon-modified porous Li 3 V 2 (PO 4 ) 3 Nanosphere material and its preparation method and application. Background technique [0002] Today, out of consideration for environmental protection, the country is vigorously developing pure electric vehicles and hybrid vehicles. The development of these electric vehicles has put forward new requirements for power lithium-ion batteries, which need to have the characteristics of high capacity, high power, long cycle life and low cost. Among many cathode materials, Li 3 V 2 (PO 4 ) 3 Because of its good structural stability, high potential, good thermal stability and high capacity, it is considered to be one of the most potential lithium-ion battery cathode materials. In practical applications, the high power of batteries is of great significance for the practical application of electric vehicles, so h...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62C01B25/45B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B25/45H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 麦立强罗艳珠皮玉强葛耀闻
Owner 皮玉强
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