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A kind of preparation method and application of circular porous tio2 nanosheet

A nano-sheet and circular technology, which is applied in the field of preparation of circular porous TiO2 nano-sheets, can solve the problems of no circular porous sheet-shaped TiO sodium ion battery negative electrode material preparation method, etc., to achieve good cycle stability, high purity, Increases the effect of penetration and contact

Inactive Publication Date: 2019-01-25
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Currently there is no circular porous TiO 2 Related patent reports on the preparation method of anode materials for sodium-ion batteries

Method used

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  • A kind of preparation method and application of circular porous tio2 nanosheet
  • A kind of preparation method and application of circular porous tio2 nanosheet
  • A kind of preparation method and application of circular porous tio2 nanosheet

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Effect test

Embodiment 1

[0014] Round Porous TiO 2 Preparation of nanosheets: Disperse 3.0 g of terephthalic acid (PTA) in a mixed solution of 8 mL of methanol (MeOH) and 55 mL of N,N-dimethylformamide (DMF) with magnetic stirring for 10 minutes, then drop Add 1.5 mL of butyl titanate and stir for 15 minutes, then add 2 mg of cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) Stir for 10 minutes, react at 170°C for 1 day, then centrifuge, wash and dry to obtain the product, and finally anneal at 400°C to obtain the final product.

[0015] Sodium-ion battery assembly: circular porous flake TiO by mass ratio 2 : Polyvinylidene fluoride: Acetylene black = 72:8:18 Mix and grind and apply evenly on 1.2 cm 2 The copper sheet is used as the positive electrode, the negative electrode is sodium metal, and the electrolyte is 1M NaClO 4 EC+DEC (EC / DEC=1 / 1 v / v) solution. Cell assembly was performed in a glove box under argon atmosphere (both oxygen and moisture content were below 1ppm).

[0016] It can be seen f...

Embodiment 2

[0018] Round Porous TiO 2 Preparation of nanosheets: Disperse 2.8 g of terephthalic acid (PTA) in a mixed solution of 5 mL of methanol (MeOH) and 52 mL of N,N-dimethylformamide (DMF) with magnetic stirring for 5 minutes, then drop Add 1.2 mL of butyl titanate and stir for 7 minutes, then add 1 mg of cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) Stir for 6 minutes, react at 150°C for 1 day, then centrifuge, wash and dry to obtain the product, and finally anneal at 390°C to obtain the final product.

[0019] Sodium-ion battery assembly: circular porous flake TiO by mass ratio 2 : polyvinylidene fluoride: acetylene black = 70:5:15 mixed and ground and evenly coated on 1.2 cm 2 The copper sheet is used as the positive electrode, the negative electrode is sodium metal, and the electrolyte is 1M NaClO 4 EC+DEC (EC / DEC=1 / 1 v / v) solution. Cell assembly was performed in a glove box under argon atmosphere (both oxygen and moisture content were below 1ppm).

Embodiment 3

[0021] Round Porous TiO 2 Preparation of nanosheets: Disperse 3.4 g of terephthalic acid (PTA) in a mixed solution of 10 mL of methanol (MeOH) and 61 mL of N,N-dimethylformamide (DMF) with magnetic stirring for 20 minutes, then drop Add 2 mL of butyl titanate and stir for 18 minutes, then add 4 mg of cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) Stir for 15 minutes, react at 180°C for 2 days, then centrifuge, wash and dry to obtain the product, and finally anneal at 450°C to obtain the final product.

[0022] Sodium-ion battery assembly: circular porous flake TiO by mass ratio 2 : polyvinylidene fluoride: acetylene black = 75: 10: 20 mixed and ground and evenly coated on 1.2 cm 2 The copper sheet is used as the positive electrode, the negative electrode is sodium metal, and the electrolyte is 1M NaClO 4 EC+DEC (EC / DEC=1 / 1 v / v) solution. Cell assembly was performed in a glove box under argon atmosphere (both oxygen and moisture content were below 1ppm).

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Abstract

The invention provides a preparation method of a circular porous TiO2 nanosheet and application thereof. The preparation method of the circular porous TiO2 nanosheet comprises the following steps: dispersing terephthalic acid in a mixed solution with methyl alcohol and N,N-dimethylformamide for magnetically stirring, then dropwise adding butyl titanate and stirring, then adding cobalt chloride hexahydrate and stirring, reacting for 1-2 days at the temperature of 150-180 DEG C, then centrifugally washing and drying, and finally annealing to obtain the circular porous TiO2 nanosheet. Through observation of a scanning electron microscope, the particle size of the circular porous TiO2 nanosheet is about 300-400nm and has a porous shape; when the circular porous TiO2 nanosheet is used as a sodium ion battery negative material, the result shows that the circular porous TiO2 nanosheet has higher specific capacity, excellent rate charging-discharging performance and high cycle stability; the current density still remains 220mAh / g<-1> after cycling for 50 times at a rate of 0.1A / g.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for sodium ion batteries, in particular to a circular porous TiO 2 Preparation methods of nanosheets and their applications. Background technique [0002] Lithium-ion batteries are widely used in mobile electronic devices, defense industry, electric vehicles and other fields due to their significant advantages such as high energy density, high voltage and long cycle life. However, with the large-scale manufacturing and application of lithium-ion batteries, the price of lithium (lithium carbonate) continues to rise, and the reserves of lithium resources in the earth are relatively small. The reserves of sodium on the earth are much more abundant than that of lithium, and metal sodium is widely available and cheap, so sodium-ion batteries have received extensive attention in recent years. At present, the lack of suitable anode materials for sodium-ion batteries restricts its application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M10/054C01G23/053B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G23/053H01M4/483H01M10/054Y02E60/10
Inventor 洪振生陈晓辉康美玲黄志高
Owner FUJIAN NORMAL UNIV
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