Nanometer ferrous silicate lithium material and preparation method thereof

A lithium ferrous silicate, nano-technology, applied in chemical instruments and methods, electrode manufacturing, phosphorus compounds, etc., can solve the problems of complex process and difficult control, and achieve high purity, good rate performance, and high charge and discharge capacity. Effect

Active Publication Date: 2009-09-30
SHENZHEN DYNANONIC
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the obtained material particles have good unifor

Method used

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Embodiment approach

[0007] Technical embodiment of the present invention is as follows:

[0008] (1) take certain quality lithium source, iron source, silicic acid source, doping element compound and dissolve in the aqueous solution containing complexing agent by stoichiometric ratio;

[0009] (2) adding certain additives to the carbon nanotubes and dispersing them into the aqueous solution by ultrasonic waves, and mixing with the aqueous solution described in (1);

[0010] (3) Heating the obtained mixed aqueous solution at 100-200° C. for 1-3 hours under nitrogen gas flow to obtain a gel;

[0011] (4) The obtained gel is sintered at 600-900° C. under an inert atmosphere, and kept at the sintering temperature for 3-16 hours to obtain a powder lithium ferrous silicate material.

[0012] The lithium source includes: one or more of lithium acetate, lithium hydroxide, lithium carbonate, lithium nitrate, lithium nitrite, lithium oxalate, lithium chloride, lithium molybdate, lithium vanadate, lithium ...

Embodiment 1

[0025] Take by weighing 29.2g ethylenediaminetetraacetic acid (EDTA) and put into 500ml water, heat, add a small amount of ammonia water and make it dissolve, add 40.4g ferric nitrate (molecular formula Fe(NO 3 ) 3 9H 2 O, 0.1mol), then add 3.75g aluminum nitrate (molecular formula Al(NO 3 ) 3 9H 2 O), add 7.81g silicic acid (molecular formula H 2 SiO 3 , 0.1mol), with 3.7g lithium carbonate (molecular formula Li 2 CO 3 , 0.05mol) was first dissolved with nitric acid, and added to the above solution; 10g of polyvinyl alcohol was weighed and dissolved in 100g of water, and 1g of single-walled carbon nanotubes were added, ultrasonically dispersed for 10min, and the carbon nanotube dispersion was also added to the above solution; The mixed solution was heated at 100-200°C for 2 hours under the protection of nitrogen to obtain a colloid, and the obtained colloid was sintered in a nitrogen atmosphere furnace at 800°C, and kept at 800°C for 7 hours to obtain nano-lithium ferr...

Embodiment 2

[0027] Take by weighing 34.2g sucrose, dissolve with 500ml water, add 40.4g ferric nitrate (molecular formula Fe(NO 3 ) 3 9H 2 O, 0.1mol), add 1.9g aluminum nitrate (molecular formula Al(NO 3 ) 3 9H 2 O), add 7.81g silicic acid (molecular formula H 2 SiO 3 , 0.1mol), with 3.7g lithium carbonate (molecular formula Li 2 CO 3 , 0.05mol) was first dissolved with nitric acid, and added to the above solution; 10g of polyvinyl alcohol was weighed and dissolved in 100g of water, 1g of double-walled carbon nanotubes were added, ultrasonically dispersed for 10min, and the carbon nanotube dispersion was also added to the above solution Heating the mixed solution at 100-150°C for 3 hours under the protection of nitrogen to obtain a colloid, sintering the obtained colloid in a nitrogen atmosphere furnace at 750°C, and keeping the temperature at 750°C for 9 hours to obtain nano-lithium ferrous silicate.

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Abstract

The invention relates to a nano ferrous silicate lithium material and a preparation method thereof. The preparation method comprises the following steps: a lithium source, an iron source, a silicate source and a doping element compound are dissolved into a water solution which contains a complexing agent according to a certain stoichiometric ratio, a high-conductivity carbon nano tube dispersed by an auxiliary agent is added into the water solution and used as a wrapping material, an obtained solution is heated under the temperature of 100-200 DEG C for 1-3 hours to obtain gelatin, the obtained gelatin is sintered in an inert atmosphere furnace, the reaction temperature is 600-900 DEG C, and the reaction time is 3-16 hours. The invention effectively controls the chemical composition, the phase composition and the grain diameter of ferrous silicate lithium, and the obtained ferrous silicate lithium is nano ferrous silicate lithium wrapped by the carbon nano tube and has small and uniform grains with high purity quotient, higher charge-discharge capacity and good multiplying power property and circulation property, thus the ferrous silicate lithium is an ideal material for producing lithium ion batteries.

Description

technical field [0001] The invention relates to a lithium ferrous silicate material and a preparation method thereof, in particular to a nanometer lithium ferrous silicate material with carbon nanotubes as a coating material and a preparation method thereof. Background technique [0002] Li 2 FeSiO 4 It is a new type of lithium-ion battery cathode material discovered in recent years. Its research is derived from the study that Li-Fe-Si-O has the same lattice stability effect as lithium iron phosphate, and this effect is caused by stable brought about by the Si-O bond. The silicon and oxygen of lithium ferrous silicate are closely combined, and it is a compound with strong stability. Lithium ferrous silicate material composed of "universal elements" with abundant resources has the characteristics of low price, non-toxic, non-polluting, good safety performance, and good stability. It is a new generation of lithium with the most potential for development and application. Th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/04C01B25/45
CPCY02E60/12Y02E60/10
Inventor 孔令涌吉学文王允实何艳艳任诚黄蓉
Owner SHENZHEN DYNANONIC
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