t-nb for lithium-ion supercapacitors 2 o 5 Egg white carbon composite material and preparation method thereof

A carbon composite material, t-nb2o5 technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of harsh experimental synthesis conditions, low efficiency utilization of Nb source precursors, etc., and achieve ease of stacking Agglomeration, increasing effective specific surface area, and enhancing the effect of environmental friendliness

Active Publication Date: 2020-09-15
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these synthesis methods have the following problems: harsh experimental synthesis conditions, inefficient utilization of Nb source precursors, and special auxiliary equipment
Therefore, looking for an efficient and simple method to synthesize nanostructured Nb 2 o 5 and Nb 2 o 5 Composites still face many challenges

Method used

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  • t-nb for lithium-ion supercapacitors <sub>2</sub> o <sub>5</sub> Egg white carbon composite material and preparation method thereof
  • t-nb for lithium-ion supercapacitors <sub>2</sub> o <sub>5</sub> Egg white carbon composite material and preparation method thereof
  • t-nb for lithium-ion supercapacitors <sub>2</sub> o <sub>5</sub> Egg white carbon composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] 1) Egg white pretreatment: remove the egg yolk and retain the egg white, stir well and set aside.

[0038] 2) 0.2 g ammonium niobate oxalate hydrate (C 4 H 4 NNbO 9 ·xH 2 O; 99.99%) was added to 10 mL of deionized water, stirred and added to 60 mL of egg white, 0.5 mL of 2 mol / L HCl was added dropwise, and the solution was stirred for 30 min until milky white, and the mixed emulsion was transferred into a 100 mL hydrothermal reactor .

[0039] 3) Put the reaction kettle into an oven, hydrothermally react at 180 °C for 24 h, naturally cool to room temperature, filter and freeze-dry the brown precipitate to obtain a mixture.

[0040] 4) Put the mixture into a crucible, move it into a tube furnace under a nitrogen atmosphere, heat it up to 700°C at a heating rate of 2°C / min, and keep it at a constant temperature for 2 hours to obtain a composite product.

[0041] 5) Washed with deionized water and absolute ethanol for several times, dried and ground to obtain porous l...

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Abstract

The invention discloses a lithium-ion supercapacitor T -Nb 2 O 5 / Egg white carbon composite material and its preparation method, adding ammonium niobate oxalate hydrate into water, stirring and adding to egg white, adding dilute hydrochloric acid and continuing to stir the solution to milky white, hydrothermal reaction, filtering and freeze drying, Then annealing is carried out in a nitrogen atmosphere, and finally the electrode material is obtained by washing, drying and grinding. The material can effectively relieve Nb 2 O 5 The stacking and agglomeration of nanoparticles can increase the effective specific surface area of ​​the material and the utilization rate of the active material; the carbon material generated after high-temperature annealing of egg white rich in nitrogen and oxygen elements can improve the wettability and conductivity of the composite material; the porous structure has It is beneficial to promote the rapid transport and diffusion of ions inside the electrode, thereby improving the rate performance and cycle stability of the electrode material.

Description

technical field [0001] The invention relates to the technical field of electrode materials for lithium ion supercapacitors, in particular to a porous electrode material for lithium ion supercapacitors T -Nb 2 o 5 / Egg white carbon composite electrode material and preparation method. Background technique [0002] Due to the urgent need for renewable clean energy, electrochemical energy storage devices have attracted much attention and been extensively studied. Among all electrochemical energy storage devices, supercapacitors and lithium-ion batteries are two favored energy storage systems. Supercapacitors (electric double layer capacitors) have high power density through rapid and stable charge adsorption / desorption on the electrode surface, but their energy density is usually low due to the limited specific surface area of ​​the electrode material. For lithium-ion batteries, because lithium ions can be intercalated into the electrode material to generate high energy dens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/44H01G11/50H01G11/30H01G11/46H01G11/86
Inventor 赵静徐宗颖王大为张淮浩
Owner YANGZHOU UNIV
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