T-Nb2O5/egg white carbon composite material used for lithium ion supercapacitor as well as preparation method thereof

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

Active Publication Date: 2019-05-17
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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-Nb2O5/egg white carbon composite material used for lithium ion supercapacitor as well as preparation method thereof
  • T-Nb2O5/egg white carbon composite material used for lithium ion supercapacitor as well as preparation method thereof
  • T-Nb2O5/egg white carbon composite material used for lithium ion supercapacitor as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

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

[0038] 2) 0.2 g ammonium niobate oxalate hydrate (C 4 h 4 NbO 9 ·xH 2 O; 99.99%) was added to 10 mL of deionized water, stirred and then 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 reaction kettle .

[0039] 3) Put the reactor into an oven, conduct a hydrothermal reaction at 180°C for 24 h, cool down to room temperature naturally, 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, raise the temperature to 700°C at a heating rate of 2°C / min, and keep the temperature constant for 2 hours to obtain a composite product.

[0041] 5) Wash with deionized water and absolute ethanol several times, dry and grind to ...

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Abstract

The invention discloses a T-Nb2O5 / egg white carbon composite material used for a lithium ion supercapacitor as well as a preparation method thereof. The preparation method comprises the following steps: adding ammonium niobate oxalate hydrate into water, stirring, then adding into egg white, dropwise adding diluted hydrochloric acid and then continuously stirring until solution becomes milk white,performing hydrothermal reaction, filtering and then performing freeze drying, then annealing in a nitrogen atmosphere, and finally performing cleaning, drying and grinding, so that the electrode material is obtained. The material can effectively alleviate stacking and agglomeration of Nb2O5 nanoparticles, so that effective specific surface area of the material is increased and utilization rate of an active material is improved; a carbon material generated after high temperature annealing is performed on the egg white rich in nitrogen and oxygen elements can improve wettability and conductivity of the composite material; and a porous structure is beneficial to promotion of rapid transmission and diffusion of ions inside an electrode, so that rate performance and cyclic stability of the electrode material are improved.

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 Applications(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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