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Biomass graded porous carbon-loaded nano-structure sodium titanate, and preparation method thereof

A structural sodium titanate, hierarchically porous technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor cycle stability and poor rate performance, and avoid thermodynamic stability. Low conductivity, improved conductivity, and reduced ion diffusion paths

Active Publication Date: 2018-10-09
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to solve the problem of existing micron Na 2 Ti 3 o 7 Problems of poor rate performance, poor cycle stability, and avoiding some problems existing in the use of nano-scale electrode materials, the first aspect of the present invention provides a biomass hierarchical porous carbon-supported nanostructured sodium titanate, the present invention The second aspect provides a preparation method of biomass hierarchical porous carbon-supported nanostructured sodium titanate

Method used

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  • Biomass graded porous carbon-loaded nano-structure sodium titanate, and preparation method thereof
  • Biomass graded porous carbon-loaded nano-structure sodium titanate, and preparation method thereof
  • Biomass graded porous carbon-loaded nano-structure sodium titanate, and preparation method thereof

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Embodiment 1

[0025]A preparation method of biomass graded porous carbon-supported nanostructure sodium titanate, comprising the following steps:

[0026] (1) Wash 10 g of cotton stalks with deionized water and ethanol, dry them, cut them into pieces and soak them in 150 mL of 6M KOH aqueous solution for 8 hours, then separate the cotton stalk fragments from the lye by suction filtration, and directly Dry in a blast oven at 80°C for 12h, then calcinate at 800°C for 2h under an argon atmosphere, then wash with 2M aqueous hydrochloric acid and deionized water until the pH of the filtrate is close to 7, and finally in a blast oven at 80°C Dry for 12 hours to obtain biomass graded porous carbon;

[0027] (2) Weigh 0.06g of the biomass graded porous carbon obtained in step (1) and disperse it in 15g of ethanol. After ultrasonically dispersing for 30 minutes, slowly add 0.678g of tetraisopropyl titanate under stirring conditions, and then place it in a 50°C oil bath Ethanol was evaporated to dry...

Embodiment 2

[0039] The preparation method of biomass graded porous carbon-loaded nanostructure sodium titanate comprises the following steps:

[0040] (1) The preparation method of biomass graded porous carbon is the same as the step (1) of embodiment 1;

[0041] (2) Weigh 0.06g of the biomass graded porous carbon obtained in step (1) and disperse it in 3g of isopropanol. After ultrasonically dispersing for 30 minutes, slowly add 0.3g of tetrabutyl titanate under stirring conditions, and then in 100°C oil Evaporate isopropanol to dryness under bath conditions;

[0042] (3) Disperse the powder obtained in step (2) in 60mL of 1M aqueous sodium hydroxide solution, and conduct a hydrothermal reaction at 120°C for 24h;

[0043] (4) Wash the precipitate obtained in step (3) with deionized water and ethanol, dry it in a blast drying oven at 120°C for 6h, and finally heat-treat it at 300°C for 8h under an argon atmosphere to obtain a biomass graded porous carbon / nano Structure Na 2 Ti 3 o 7 ...

Embodiment 3

[0045] The preparation method of biomass graded porous carbon-supported nanostructure sodium titanate comprises the following steps:

[0046] (1) Wash 10 g of cotton stalks with deionized water and ethanol, dry them, cut them into pieces and soak them in 1L of 1M KOH aqueous solution for 8 hours, then separate the cotton stalk fragments from the lye by suction filtration, and directly Dry in a blast oven at 120°C for 6h, then calcinate at 700°C for 8h in an argon atmosphere, then wash with 2M aqueous hydrochloric acid and deionized water until the pH of the filtrate is close to 7, and finally in a blast oven at 120°C Dry for 6h to obtain biomass graded porous carbon;

[0047] (2) Weigh 0.06g of the biomass graded porous carbon obtained in step (1) and disperse it in 15g of chloroform. After ultrasonic dispersion for 30 minutes, slowly add 0.678g of tetraethyl titanate under stirring conditions, and then in 50 ℃ oil bath condition The chloroform was evaporated to dryness;

[...

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Abstract

The invention discloses a preparation method of biomass graded porous carbon-loaded nano-structure sodium titanate. The preparation method comprises the following steps: dispersing biomass graded porous carbon into an organic solvent, adding titanate, and evaporating the organic solvent under an oil bath; dispersing the obtained powder into a sodium hydroxide solution to perform a hydrothermal reaction; and washing and drying the obtained precipitate, and performing a heat treatment under an inert gas atmosphere. The biomass graded porous carbon can provide large specific surface area to loadNa2Ti3O7; in the nano-structure Na2Ti3O7, the electron transmission distance and the ion diffusion path are greatly reduced, and the structural stress in a sodium storage process can be alleviated atthe same time; the biomass graded porous carbon has relatively higher electrical conductivity, which is conducive to improving the overall electrical conductivity of the composite material; and the biomass graded porous carbon is on the micron scale as a whole, and the composite material constructed by using the biomass graded porous carbon as the matrix can effectively avoid the defects of low thermodynamic stability, and easy agglomeration, membrane penetration and biotoxicity of a nanometer electrode material.

Description

technical field [0001] The invention relates to electrode material sodium titanate, in particular to biomass graded porous carbon-loaded nanostructure sodium titanate and a preparation method thereof. Background technique [0002] Sodium-ion hybrid capacitors are a new type of electrochemical energy storage technology developed in recent years that combines the advantages of sodium-ion batteries and supercapacitors. The two electrodes of the sodium-ion hybrid capacitor use the electrode materials of sodium-ion batteries and supercapacitors respectively. It integrates low cost, high specific energy, large specific power and long service life. It is suitable for occasions that require fast charging and high power output. Examples include electric vehicles, smart grids, drones, cranes, and mobile laser weapons. Based on the "short plate effect", the specific power and service life of sodium-ion hybrid capacitors are limited by the electrode materials of the battery type. Ther...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/44H01G11/46H01G11/06B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/06H01G11/24H01G11/30H01G11/44H01G11/46Y02E60/13
Inventor 陈继章昝智华
Owner NANJING FORESTRY UNIV
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