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Biomimetic synthesis method of lithium vanadium phosphate/carbon nanometer composite mesoporous microspheres as positive electrode material of lithium ion battery

A nano-composite, lithium vanadium phosphate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low conductivity and conductivity of lithium vanadium phosphate

Inactive Publication Date: 2012-06-20
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of low conductivity and conductivity of lithium vanadium phosphate existing in the prior art, the present invention provides a lithium vanadium phosphate / carbon (Li vanadium phosphate) with excellent comprehensive electrochemical properties. 3 V 2 (PO 4 ) 3 / C) Biomimetic synthesis method of nanocomposite mesoporous microsphere materials

Method used

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  • Biomimetic synthesis method of lithium vanadium phosphate/carbon nanometer composite mesoporous microspheres as positive electrode material of lithium ion battery
  • Biomimetic synthesis method of lithium vanadium phosphate/carbon nanometer composite mesoporous microspheres as positive electrode material of lithium ion battery
  • Biomimetic synthesis method of lithium vanadium phosphate/carbon nanometer composite mesoporous microspheres as positive electrode material of lithium ion battery

Examples

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Effect test

Embodiment 1

[0041] Take 2ml of fresh green algae solution prepared by Chlorella (Chlorella) algae numbered FACHB-1227, put it in 50ml of distilled water, change the water once every 3h, and continuously starve for one day at 25°C to obtain starved green algae. Algae cell solution, the cell concentration in the control solution is 6.5×10 7 unit / ml, recorded as A solution.

[0042] Dissolve analytically pure vanadium pentoxide and oxalic acid in an aqueous solution at a molar ratio of 1:2, heat and stir in a water bath at 70°C for about 0.5 h to prepare a 1 mol / L vanadium ion solution, and obtain B solution.

[0043] According to the volume ratio of solution B: solution A = 1:2, solution B was added dropwise to solution A, and stirred thoroughly for 5 hours to obtain C sol solution.

[0044] According to Li 3 V 2 (PO 4 ) 3 Stoichiometric ratio, add 0.5 mol / L ammonium dihydrogen phosphate to the C sol solution, stir for 5 hours, then add 0.8 mol / L lithium nitrate (lithium source), and s...

Embodiment 2

[0046] As described in Example 1, the difference is that the lithium nitrate lithium source is replaced by lithium hydroxide, and other conditions are the same as in Example 1. The resulting black powder Li 3 V 2 (PO 4 ) 3 / C nanocomposite mesoporous microspheres, the products were analyzed by XRD, which showed that they were all monoclinic Li 3 V 2 (PO 4 ) 3 Complexes with C, such as figure 1 as shown in b. The bulk density of synthetic composite powder can reach 1.51g / cm 3 , the conductivity is 6.507×10 -3 S / cm, when the charge and discharge voltages are 3.0-4.3V and 3.0-4.8V respectively, the first discharge specific capacity at 0.1C rate can reach 124mAh / g and 183mAh / g respectively, and the discharge retention rate is 95% and 91% respectively. After 40 weeks of circulation, the specific capacities were 115mAh / g and 140mAh / g, and the retention rates were 88% and 76%, respectively.

Embodiment 3

[0048] As described in Example 1, the difference is that the lithium nitrate lithium source is replaced by lithium acetate, and other conditions are the same as in Example 1. The resulting black powder Li 3 V 2 (PO 4 ) 3 / C nanocomposite mesoporous microspheres, the products were analyzed by XRD, which showed that they were all monoclinic Li 3 V 2 (PO 4 ) 3 Complexes with C, such as figure 1 as shown in c. The bulk density of synthetic composite powder can reach 1.35g / cm 3 , the conductivity is 1.915×10 -4 S / cm, when the charge and discharge voltages are 3.0-4.3V and 3.0-4.8V respectively, the first discharge specific capacity at 0.1C rate can reach 104mAh / g and 173mAh / g respectively, and the discharge retention rate is 92% and 89% respectively. After 40 weeks of circulation, the specific capacities were 97mAh / g and 139mAh / g, and the retention rates were 86% and 75%, respectively.

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Abstract

The invention relates to a preparation method of lithium vanadium phosphate / carbon nanometer composite mesoporous microspheres as positive electrode material of a lithium ion battery. The preparation method comprises the following steps: preparing hungry green algae cell solution from inexpensive green algae cells; adding vanadium oxalate solution into the hungry green algae cell solution dropwise; adding phosphate source and lithium source to obtain gel; drying to obtain lithium vanadium phosphate precursor; grinding lithium vanadium phosphate precursor; heating at about 450 DEG C in the nitrogen atmosphere; and heating to about 750 DEG C and preserving the temperature to obtain black powdered Li3V2(PO4)3 / C nanometer composite mesoporous microspheres. The lithium vanadium phosphate / carbon nanometer composite mesoporous microspheres prepared by the invention can be used as the positive electrode material of the lithium ion battery, and can be used for preparing portable or power lithium ion battery.

Description

(1) Technical field [0001] The present invention relates to a lithium vanadium phosphate / carbon (Li 3 V 2 (PO 4 ) 3 / C) A biomimetic synthesis method of nanocomposite mesoporous microspheres, which belongs to the technical field of cathode materials for lithium-ion batteries. (2) Background technology [0002] Lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) due to its cheap and abundant raw materials, stable structure, high discharge platform (average 4.0V) and theoretical energy density (780Wh / Kg), good reversibility, no memory effect, small self-discharge, long cycle life, and little pollution. Become an important cathode material for lithium-ion batteries. Lithium vanadium phosphate has three lithiums that can be freely inserted and extracted, so that its maximum theoretical capacity reaches 197mAh / g, and the high-voltage charging efficiency is good. Therefore, lithium vanadium phosphate has attracted great attention from people at home and abroad, and is consid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 何文张旭东杜晓永杜毅
Owner QILU UNIV OF TECH
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