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Oxygen-vacancy-containing lithium ferrous silicate and carbon composite anode material and preparation method

A technology of lithium ferrosilicate and cathode material, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as inability to apply power batteries

Inactive Publication Date: 2011-09-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although these composite materials have high capacity performance and good rate performance, they still cannot be applied to power batteries

Method used

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  • Oxygen-vacancy-containing lithium ferrous silicate and carbon composite anode material and preparation method
  • Oxygen-vacancy-containing lithium ferrous silicate and carbon composite anode material and preparation method
  • Oxygen-vacancy-containing lithium ferrous silicate and carbon composite anode material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1.799 g FeC 2 o 4 2H 2 O and 2.08 g Si(OC 2 h 5 ) 4 Mixed, added to 150ml of ethylenediamine (accounting for 20wt%) in absolute ethanol, the pH value was controlled at 9, after stirring vigorously at room temperature for 6h, 2.04g of LiAc·2H was added 2 O and 0.2 g of glucose, the temperature was raised to 80°C for 12h, and then dried at 100°C to obtain a xerogel. Transfer it to a porcelain boat in a tube resistance furnace under Ar / H 2 (H 2 accounted for 3% of the volume), first heated to 400°C at a rate of 5°C / min for 12 hours, then cooled to room temperature at a rate of 5°C / min, took out the powder and pressed it into tablets, and then calcined at a temperature of 700°C After 24 hours, it was naturally lowered to room temperature to obtain an oxygen-vacancy-containing lithium ferrous silicate / carbon composite material. The obtained material is orthorhombic and the space group is Pmn21 through target XRD analysis. A bulk crystal with a particle size of about...

Embodiment 2

[0032] 1.24 g FeAc 2 4H 2 O and 2.08 g Si(OC 2 h 5 ) 4 Mixed, added to 150ml of N-ethylethylenediamine (accounting for 20wt%) absolute ethanol, the pH value was controlled at 10, after stirring vigorously at room temperature for 12h, 2.04g of LiAc·2H was added 2 O and 0.3 g of glucose, the temperature was raised to 90° C. for 24 hours, and then dried at 100° C. to obtain a xerogel. Transfer it to a porcelain boat in a tube resistance furnace under Ar / H 2 (Ar accounted for 3% of the volume), first heated to 450°C at a rate of 5°C / min for 12 hours, then cooled to room temperature at a rate of 5°C / min, took out the powder and pressed it, and then heated it at a temperature of 750°C The temperature was calcined for 24 hours, and it was naturally lowered to room temperature to obtain the oxygen-vacancy lithium ferrous silicate and carbon composite material Li 2 FeSiO 3.78 N 0.13 / C.

[0033] The electrochemical performance of the obtained sample is measured according to th...

Embodiment 3

[0035] 2.88 g FeC 3 h 10 o 3 and 2.08 grams of Si(OC 2 h 5 ) 4 Mixed, added to 150ml of tetramethylethylenediamine (accounting for 20wt%) in absolute ethanol, the pH value was controlled at 8.5, after vigorous stirring at room temperature for 6h, 2.04g of LiAc·2H was added 2 O and 0.1 gram of glucose, the temperature was raised to 90°C for 12h, and then dried at 100°C to obtain a xerogel. Transfer it to a porcelain boat in a tube resistance furnace under Ar / H 2 (Ar accounted for 3% of the volume), first heated to 400°C at a rate of 5°C / min for 10 h, then cooled to room temperature at a rate of 5°C / min, took out the powder and pressed it, and then heated it at a temperature of 650°C The temperature was calcined for 24 hours, and it was naturally lowered to room temperature to obtain the oxygen-vacancy lithium ferrous silicate and carbon composite material Li 2 FeSiO 3.21 N 0.48 / C.

[0036] The electrochemical performance of the obtained sample is measured according t...

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Abstract

The invention relates to a secondary lithium battery anode composite material, in particular to an oxygen-vacancy-containing lithium ferrous silicate and carbon composite material. The chemical formula of the composite material is Li2FeSiO4-xNy / C, wherein x is more than 0 and less than or equal to 1, y is more than 0 and less than or equal to 0.5, the condition that x is more than or equal to 3y / 2 is met, and carbon content is 5-20wt%. The intrinsic conductivity and the lithium ion conductivity inside granules of the composite material are high, and the composite material has excellent performances such as high capacity and high multiplying power. The preparation method of the composite material comprises the steps of: preparing sol from lithium salt, ferrous salt, a silicon source and a carbon source and then carrying out high temperature calcination on the sol twice to obtain granular and oxygen-vacancy-containing lithium ferrous silicate and carbon composite material.

Description

technical field [0001] The invention relates to a lithium ferrous silicate and carbon composite material and a preparation method for a secondary battery in the energy industry, in particular to an oxygen-vacancy-containing lithium ferrous silicate and carbon composite material with excellent electrochemical performance and a preparation method. Background technique [0002] Lithium-ion power batteries have been gradually replacing traditional batteries. Lithium-ion batteries are used in mobile phones, notebook computers, cameras, and video cameras. Lithium-ion electric vehicles have also entered the market. The performance of the battery depends mainly on the performance of the positive electrode material. . In 2005, Anton Nyte′n et al successfully synthesized Li 2 FeSiO 4 As a cathode material for lithium-ion batteries, it has been reported that it is a polyanion-type orthorhombic structure. Its characteristics are summarized as follows: 1) Good performance at high temp...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 木士春杨金龙
Owner WUHAN UNIV OF TECH
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