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Preparation method of Li0.5TiO2 powder material

A powder material and powder technology, applied in the field of functional materials, can solve the problems of limited application and low electrical conductivity, and achieve the effects of high specific capacity, low preparation temperature, and easy industrial production

Active Publication Date: 2017-10-13
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Li 4 Ti 5 o 12 The theoretical specific capacity is only 175mAh / g, and the conductivity at 20°C is very low, only 10 -9 s / cm, which limits its application

Method used

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  • Preparation method of Li0.5TiO2 powder material
  • Preparation method of Li0.5TiO2 powder material
  • Preparation method of Li0.5TiO2 powder material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] TiO 2 Powder and Li 2 CO 3 Weigh the corresponding masses according to the molar ratio of 1:1.05, and then fully grind and mix the two materials evenly. The mixed sample was placed in a corundum crucible, and kept at 650 ° C for 8 h in a tube furnace with high-purity argon to obtain Li 2 TiO 3 Powder material.

[0019] Will Li 2 TiO 3 Weigh two samples of corresponding mass according to the molar ratio of 2:1.05 with Mg, grind and mix thoroughly, put the fully mixed sample in a corundum crucible, and then put it into a tube furnace with high-purity argon gas at 600 ℃ insulation 6h for magnesia thermal reduction reaction. The product obtained after the reaction was put into dilute hydrochloric acid solution and stirred for 1 h, then the residue was repeatedly washed with alcohol and deionized water, centrifuged and dried to obtain Li 0.5 TiO 2 Powder material.

[0020] figure 1 (a) is Li 2 TiO 3 The X-ray diffraction spectrum of Li 2 TiO 3 The standard spe...

Embodiment 2

[0023] The prepared Li 2 TiO 3 Weigh the two samples of corresponding mass according to the molar ratio of 2:1.2 with Mg, grind and mix them thoroughly, put the fully mixed samples in a corundum crucible, and then put them into a tube furnace with high-purity argon gas at Incubate at 620°C for 4h for magnestic reduction reaction. The product obtained after the reaction was put into dilute hydrochloric acid solution and stirred for 1 h, then the residue was repeatedly washed with alcohol and deionized water, centrifuged and dried to obtain Li 0.5 TiO 2 Powder material.

[0024] image 3 (a) is the X-ray diffraction spectrum of the magnesium thermal reduction product, and LiTiO 2 The standard map (PDF#40-1053) is consistent. Inductively coupled plasma atomic emission spectrometry analysis shows that the atomic ratio of Li:Ti in the product is 0.5:1, so the product is Li 0.5 TiO 2 . image 3 (b) is its SEM photo, Li 0.5 TiO 2 The particle size of the powder is about 10...

Embodiment 3

[0026] The prepared Li 2 TiO 3 Weigh the two samples of corresponding mass according to the molar ratio of 2:1.4 with Mg, grind and mix them thoroughly, put the fully mixed samples in a corundum crucible, and then put them into a tube furnace with high-purity argon gas at Incubate at 640°C for 3h for magnestic reduction reaction. The product obtained after the reaction was put into dilute hydrochloric acid solution and stirred for 1 h, then the residue was repeatedly washed with alcohol and deionized water, centrifuged and dried to obtain Li 0.5 TiO 2 Powder material.

[0027] Figure 4 (a) is the X-ray diffraction spectrum of the magnesium thermal reduction product, and LiTiO 2 The standard map (PDF#40-1053) is consistent. Inductively coupled plasma atomic emission spectrometry analysis shows that the atomic ratio of Li:Ti in the product is 0.5:1, so the product is Li 0.5 TiO 2 . Figure 4 (b) is Li 0.5 TiO 2 Scanning electron microscope pictures of powder material...

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Abstract

The invention relates to a preparation method of a Li0.5TiO2 powder material. The method comprises the following steps: TiO2 and Li2CO3 which are used as reactants are sintered under an argon protection condition for 8 h to obtain the Li2TiO3 powder; and the Li2TiO3 powder is reduced by Mg powder used as a reducing agent in an argon protection atmosphere at a high temperature, and MgO and Li2O in the above obtained product are removed through diluted hydrochloric acid washing in order to obtain the Li0.5TiO2 powder material. The preparation method has the advantages of low preparation temperature, small energy consumption, simple preparation process, and easiness in industrial production.

Description

technical field [0001] The present invention relates to a kind of preparation method of lithium ion battery electrode material, particularly relate to negative electrode active material Li 0.5 TiO 2 Preparation method of powder material. The invention belongs to the field of functional materials. Background technique [0002] In recent years, with the rapid development of portable consumer electronics and new energy electric vehicles, people have put forward higher requirements for the capacity, cycle life and safety of lithium-ion batteries. At present, the negative electrode active materials of commercial lithium-ion batteries use various graphite-based carbon materials, but because the lithium-intercalation potential of graphite-based carbon materials is close to that of metal lithium, it is possible to precipitate lithium dendrites, penetrate the battery diaphragm, and cause combustion or explosion. Wait for an accident. In recent years, Li-Ti-O series compounds have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00
CPCC01G23/005C01P2004/03C01P2006/40C01P2004/62
Inventor 陈玉喜匡艳
Owner HUNAN UNIV
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