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Two-step synthesis of core-shell Agtio2 complexes and their application as anodes for lithium-ion batteries

A technology for synthesizing nuclei and complexes, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of complex process, low yield, and high cost, and achieve simple process, high yield, and low cost Effect

Inactive Publication Date: 2016-03-30
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the shortcomings of the prior art, such as complicated process, long time-consuming, high cost, and low yield, the purpose of the present invention is to propose an alcohol-thermal method for synthesizing TiO with a spherical hollow core-shell structure. 2 , and then impregnated and calcined to make the doped Ag-coated core-shell TiO 2 surface, making TiO 2 Two-step synthesis of core-shell AgTiO with original morphology after Ag doping 2 composite method and make the product as AgTiO 2 Composite lithium-ion battery anode materials have the characteristics of high electrochemical specific capacity, good cycle stability, low cost, and easy industrial production

Method used

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  • Two-step synthesis of core-shell Agtio2 complexes and their application as anodes for lithium-ion batteries
  • Two-step synthesis of core-shell Agtio2 complexes and their application as anodes for lithium-ion batteries
  • Two-step synthesis of core-shell Agtio2 complexes and their application as anodes for lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] With Ti(OC 4 h 9 ) 4 (purity>99.0%), ethanol (purity>99.0%) glycerol (purity>99.0%), ether (purity>99.5%) as the initial raw materials, measure 3.4ml of Ti(OC 4 h 9 )4 , 23.4ml of ethanol, 11.7ml of glycerin, and 11.4ml of diethyl ether are fully mixed, and the mixed solution is transferred to a 100ml polytetrafluoroethylene reaction kettle, heated to 110°C in a muffle furnace, kept for 18 hours, and naturally cooled to room temperature. Wash several times with distilled water and ethanol, dry at 60°C for 12h, and roast the product at 450°C for 2h.

[0026] Add 4.3 mL of silver nitrate solution with a concentration of 0.1 mol / L to 0.4615 g of TiO 2 , stirred and impregnated for 2 h, followed by vacuum drying at 100 °C, the resulting powder was calcined at 450 °C for 1 h, cooled to room temperature, and the final product AgTiO 2 composite material.

[0027] Add 10wt% conductive agent acetylene black and 10wt% binder PVDF to the synthesized material to make a slurr...

Embodiment 2

[0029] With Ti(OC 4 h 9 ) 4 (purity>99.0%), ethanol (purity>99.0%) glycerol (purity>99.0%), ether (purity>99.5%) as the initial raw materials, measure 3.4ml of Ti(OC 4 h 9 ) 4 , 23.4ml of ethanol, 11.7ml of glycerin, and 11.4ml of diethyl ether are fully mixed, and the mixed solution is transferred to a 100ml polytetrafluoroethylene reaction kettle, heated to 110°C in a muffle furnace, kept for 24 hours, and naturally cooled to room temperature. Wash several times with distilled water and ethanol, dry at 60°C for 12h, and roast the product at 450°C for 4h.

[0030] Add 0.1 mol / L silver nitrate solution dropwise to the synthesized material, stir and impregnate for 2 h, then vacuum-dry at 100 °C, the obtained powder is calcined at 450 °C for 1 h, and cooled to room temperature to obtain the final AgTiO 2 composite material.

[0031] Add 10wt% conductive agent acetylene black and 10wt% binder PVDF to the synthesized material to make a slurry, evenly coat it on copper and p...

Embodiment 3

[0033] With Ti(OC 4 h 9 ) 4 (purity>99.0%), ethanol (purity>99.0%) glycerol (purity>99.0%), ether (purity>99.5%) as the initial raw materials, measure 3.4ml of Ti(OC 4 h 9 ) 4 , 23.4ml of ethanol, 11.7ml of glycerin, and 11.4ml of ether were mixed thoroughly, and the mixed solution was transferred to a 100ml polytetrafluoroethylene reaction kettle, heated to 110°C in a muffle furnace, kept for 48 hours, and naturally cooled to room temperature. Wash several times with distilled water and ethanol, dry at 60°C for 12h, and roast the product at 450°C for 6h.

[0034] Add 0.1 mol / L silver nitrate solution dropwise to the synthesized material, stir and impregnate for 2 h, then vacuum-dry at 100 °C, the obtained powder is calcined at 450 °C for 1 h, and cooled to room temperature to obtain the final AgTiO 2 composite material.

[0035] Add 10wt% conductive agent acetylene black and 10wt% binder PVDF to the synthesized material to make a slurry, evenly coat it on copper and pl...

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Abstract

The invention provides a two-step synthesis method for a core-shell Ag-coated TiO2 compound and application of the compound as a negative electrode of a lithium ion battery, belonging to the field of negative electrode materials of lithium ion batteries. According to the invention, Ti(OC4H9)4 is used as a titanium source, ethanol, glycerin and ether are used as solvents, spherical hollow core-shell-structured TiO2 is subjected to alcoholysis at a certain temperature, then dipping and roasting are carried out to allow the surface of TiO2 to be coated by doping Ag, so Ag-coated TiO2 is synthesized in two steps. The Ag-coated TiO2 compound synthesized by using a preferable method is a core-shell-structured sphere which has a diameter of about 2 mu m and is composed of nanorods with a diameter of 20 to 30 nm, and the compound has a high degree of crystallization and a great specific surface area. As a negative electrode material of a lithium ion battery, the Ag-coated TiO2 compound has reversible capacity as high as 217 mAh / g, quintic discharge capacity maintained to be 190 mAh / g, discharge capacity maintained to be 170 mAh / g after 200 cycles and a capacity retention ratio of 89.5%. The preparation method provided by the invention is of critical significance to application of Ti-based materials in lithium ion batteries.

Description

technical field [0001] The invention belongs to the material used for the negative electrode of lithium ion battery, particularly relates to AgTiO 2 Complex. Background technique [0002] With the continuous development of information technology and the continuous improvement of people's awareness of environmental protection, the development of high-capacity, recyclable, and pollution-free green materials has become an urgent problem to be solved. Among energy storage materials, there is less space for the development of cathode materials for lithium-ion batteries, so anode materials have become an important research object for improving battery energy and cycle life. The actual capacity of commercialized carbon anode materials is close to its theoretical value, and there is little potential to further improve the lithium intercalation capacity of this material. At the same time, the lithium intercalation potential of the graphite-based negative electrode is close to that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/48H01M4/62H01M4/13
CPCY02E60/10
Inventor 郭洪王微刘丽香郭园园杨项军
Owner YUNNAN UNIV