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Preparation method of fluorine and yttrium-doped lithium ferrous silicate composite material for lithium-ion battery

A lithium ferrosilicate, lithium ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of slow lithium ion diffusion rate, low electronic conductivity, etc., to improve the cycle stability and improve the ratio. capacity, the effect of increasing the diffusion rate

Inactive Publication Date: 2018-05-22
宁波高新区锦众信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of lithium ferrous silicate is its low electronic conductivity and slow diffusion rate of lithium ions. Most of them can only be charged and discharged under a small current, which has become a barrier to the practical use of this material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of fluorine-doped and yttrium-doped lithium iron silicate precursor

[0020] The reactant is weighed lithium acetate, ferrous oxalate, yttrium oxide, silicic acid, ammonium fluoride according to the molar ratio of lithium ion: ferrous ion: yttrium ion: silicon ion: fluoride ion is 1.85: 0.975: 0.05: 0.75: 0.05 Mix hot water with silicic acid temperature of 70-95°C, add lithium acetate compound, stir and mix, and then mix in all other reactants. The amount of hot water is 2 times the total volume of the reactant solids. The rotating speed of the ball mill was mixed for 15 hours, and the temperature was dried in a vacuum at a temperature of 100° C. to prepare a dry powder to obtain a fluorine- and yttrium-doped lithium iron silicate precursor.

[0021] Preparation of Porous Graphene

[0022] Put the porous magnesia / silicon composite material with a uniform molar ratio of 2:1 as a template into the chemical vapor deposition reaction chamber, and completely dri...

Embodiment 2

[0026] Preparation of fluorine and yttrium doped lithium iron silicate precursor

[0027] The reactant is weighed lithium acetate, ferrous oxalate, yttrium oxide, silicic acid, ammonium fluoride according to the molar ratio of lithium ion: ferrous ion: yttrium ion: silicon ion: fluoride ion is 1.95: 0.95: 0.02: 0.70: 0.1 ; Silicic acid temperature 95 ℃ hot water mixing, add lithium acetate compound, stir and mix, and then mix in all other reactants, the amount of hot water is 5 times the total volume of the reactant solid volume, with a rotating speed of 800rpm Ball milling and mixing for 12 hours, drying in a vacuum at a temperature of 120° C. to prepare a dry powder, and obtain a fluorine- and yttrium-doped lithium iron silicate precursor.

[0028] Preparation of Porous Graphene

[0029] Put the porous magnesia / silicon composite material with a uniform molar ratio of 2:1 as a template into the chemical vapor deposition reaction chamber, and completely drive out the air in t...

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Abstract

The invention discloses a preparation method of a fluorine and yttrium-doped lithium ferrous silicate composite material for a lithium-ion battery. The method comprises the following steps of (1) preparing a fluorine and yttrium-doped lithium iron silicate precursor; (2) preparing porous graphene; and (3) mechanically mixing the porous graphene with the precursor, mixing evenly in a ball milling manner and then burning in a tube furnace in helium atmosphere to obtain porous graphene-coated fluorine-doped lithium ferrous silicate. According to the prepared lithium ferrous silicate composite material for the lithium-ion battery, lithium ferrous silicate is modified by adopting fluorine and a rare-earth material yttrium, so that the cycling stability of the material is improved; and sinteringcoating is also carried out on the fluorine and yttrium-doped lithium ferrous silicate by adopting the porous graphene, so that the conductivity of the material is further improved. Therefore, when the composite material is applied to the lithium-ion battery, the lithium-ion battery has high specific capacity and relatively long service life.

Description

Technical field [0001] The invention relates to a preparation method of a fluorine and yttrium doped lithium ferrous silicate composite material for a lithium ion battery. Background technique [0002] Lithium-ion batteries have become the most popular choice for mobile communications, notebook computers and cameras (cameras) due to their high operating voltage (more than 3 volts relative to metal lithium), high specific energy, low self-discharge rate, no memory effect and excellent cycle stability. The preferred power supply for small electronic devices such as Lithium cobaltate (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMn 2 o 4 ) and lithium iron phosphate (LiFePO 4 ) are used as cathode materials for lithium-ion batteries. Among them, LiCoO 2 High cost, expensive, poor resources, high toxicity; LiNiO 2 Difficult to prepare. Poor thermal stability and poor safety; LiMn 2 o 4 Although the safety performance is good, its capacity decay is obv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/5825H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 蒋玛丽
Owner 宁波高新区锦众信息科技有限公司
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