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Preparation method of hydroxyapatite-coated lithium titanate

A technology of hydroxyapatite and coating lithium titanate, applied in active material electrodes, electrical components, battery electrodes, etc., can solve the problem that the speed of energy release is not fast enough, the precipitation of lithium dendrites is a safety hazard, and the charging and discharging platform is low, etc. problem, to achieve excellent electrochemical performance, low price, and the effect of inhibiting growth

Active Publication Date: 2015-12-23
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0002] Traditional anode materials are mainly carbon materials. Carbon materials have the advantages of good cycle stability and low charge-discharge platform, but there are also some disadvantages, such as the potential safety hazard of lithium dendrite precipitation, and the speed of energy release is not fast enough, so it is not suitable for Equipment requiring instantaneous high current, etc.

Method used

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  • Preparation method of hydroxyapatite-coated lithium titanate

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method for hydroxyapatite-coated lithium titanate, comprising the following steps:

[0021] (1) Using isopropanol as a solvent, prepare a concentration of 0.1mol / L lithium hydroxide solution and a concentration of 0.1mol / L tetrabutyl titanate solution respectively;

[0022] (2) Ultrasonic disperse 0.0735g of hydroxyapatite with a mass fraction of 1% in isopropanol, add 0.0735g of ethylenediaminetetraacetic acid with a mass fraction of 1%, and slowly add 40mL of the solution under constant magnetic stirring. 1mol / L lithium hydroxide solution, 50mL 0.1mol / L tetrabutyl titanate solution, in which the molar ratio of lithium ions to titanium ions is 4:5; stir in a water bath at 40°C for 1 hour to obtain a gel, and place the gel in Vacuum drying at 60°C, grinding and crushing to obtain the precursor;

[0023] (3) The precursor was placed in a muffle furnace, and calcined at 650° C. for 5 hours in an air atmosphere to obtain a hydroxyapatite-coated lithium titan...

Embodiment 2

[0026] A preparation method for hydroxyapatite-coated lithium titanate, comprising the following steps:

[0027] (1) Using absolute ethanol as a solvent, prepare a concentration of 0.5mol / L lithium acetate solution respectively, and a concentration of 0.6mol / L tetraethyl titanate;

[0028] (2) Ultrasonic disperse 1.1020 g of hydroxyapatite with a mass fraction of 3% in absolute ethanol, add 1.1020 g of oxalic acid with a mass fraction of 3%, and slowly add 60 mL of 0.5 mol / L lithium acetate under constant magnetic stirring Solution, 62.5mL0.6mol / L tetraethyl titanate, in which the molar ratio of lithium ions to titanium ions is 4:5; stir in a water bath at 50°C for 3h to obtain a gel, and dry the gel in vacuum at 70°C , grinding and pulverizing to obtain the precursor;

[0029] (3) The precursor was placed in a muffle furnace and calcined at 750° C. for 6 hours in an air atmosphere to obtain a lithium titanate negative electrode material coated with hydroxyapatite.

[0030] ...

Embodiment 3

[0032] A preparation method for hydroxyapatite-coated lithium titanate, comprising the following steps:

[0033] (1) taking diethanolamine as solvent, preparing concentration respectively is 1mol / L lithium nitrate solution, and concentration is 1.1mol / L tetraisopropyl titanate solution;

[0034] (2) Ultrasonic dispersion of 1.8366g of hydroxyapatite with a mass fraction of 5% in diethanolamine, adding 3.6732g of citric acid with a mass fraction of 10%, and slowly adding 40mL of 1mol / L lithium nitrate solution under constant magnetic stirring, 45.5 mL of 1.1 mol / L tetraisopropyl titanate solution, in which the molar ratio of lithium ions to titanium ions is 4:5; stir in a water bath at 60°C for 5 hours to obtain a gel, and vacuum-dry the gel at 70°C , grinding and pulverizing to obtain the precursor.

[0035] (3) The precursor was placed in a muffle furnace and calcined at 800° C. for 8 hours in an air atmosphere to obtain a hydroxyapatite-coated lithium titanate negative elec...

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Abstract

The invention discloses a preparation method of hydroxyapatite-coated lithium titanate. The method comprises the following steps: respectively preparing a lithium source solution of a certain concentration and a titanium source solution of a certain concentration; adding the lithium source solution and the titanium source solution to sol with a certain ratio of hydroxyapatite, and carrying out water bath and magnetic stirring to form gel; drying the gel to prepare a precursor; and grinding, crushing and calcining the precursor to obtain a hydroxyapatite-coated lithium titanate anode material. According to the preparation method of the hydroxyapatite-coated lithium titanate, the hydroxyapatite can effectively coat the surface of the lithium titanate, inhibits growth of particles, and shows relatively high electrochemical activity. The pH value of the material can be lowered; and the hygroscopic property of the material is inhibited. According to the preparation method, the required raw materials are low in price; the operation is simple and feasible; and the prepared lithium titanate anode material has excellent electrochemical properties.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a preparation method for coating lithium titanate with hydroxyapatite, belonging to the fields of new materials and energy. Background technique [0002] Traditional anode materials are mainly carbon materials. Carbon materials have the advantages of good cycle stability and low charge-discharge platform, but there are also some disadvantages, such as the potential safety hazard of lithium dendrite precipitation, and the speed of energy release is not fast enough, so it is not suitable for Equipment that requires instantaneous high current, etc. Compared with carbon materials, lithium titanate (Li 4 Ti 5 o 12 ) has obvious advantages, such as almost "zero volume change" during charging and discharging, good cycle performance, high Coulombic efficiency, and no reaction with electrolyte, etc., and has become a hot research topic at home and abroad in recent ye...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/62H01M4/1391
CPCH01M4/1391H01M4/362H01M4/485H01M4/62H01M2004/027Y02E60/10
Inventor 刘兴亮杨茂萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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