Method for preparing nitrogen and phosphorus co-doped graphene gel electrochemical sodium storage electrode

A graphene gel and co-doping technology, which is applied in the fields of energy storage and electrochemistry, can solve the problems of poor performance of negative electrode materials, complex synthesis process, poor conductivity, etc., to improve structural stability and electrochemical performance, Simplify the synthesis process and improve the effect of mass specific capacity

Inactive Publication Date: 2018-06-29
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In view of the poor conductivity of the traditional graphene, the poor performance as a negative electrode material for sodium ion batteries, and the low content of nitrogen and phosphorus in the traditionally synthesized nitrogen-phosphorus graphene and the complex synthesis process, the present invention proposes nitrogen and phosphorus co-doped The preparation method of the heterographene gel electrochemical sodium storage electrode can improve the structural stability and electrochemical performance of the negative electrode material of the sodium ion battery, and improve the cycle performance and rate performance of the material in the charge and discharge process. In addition, the process of the method Simple, short reaction time, simplifies the synthesis process and reduces the preparation cost

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  • Method for preparing nitrogen and phosphorus co-doped graphene gel electrochemical sodium storage electrode
  • Method for preparing nitrogen and phosphorus co-doped graphene gel electrochemical sodium storage electrode

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Embodiment 1

[0036] A kind of preparation method of nitrogen, phosphorus co-doped graphene gel electrochemical sodium storage electrode, comprises the steps:

[0037] S1. Disperse graphene oxide in water, sonicate until the graphene is uniformly dispersed, and the concentration of graphene oxide is about 15 g / ml;

[0038] S2. Add melamine to the graphene liquid obtained in S1 for ultrasonic mixing, the mass ratio of melamine and graphene is 2:1 (NPG);

[0039]S3. The mixed dispersion system obtained in S2 was subjected to hydrothermal reaction, the hydrothermal temperature was 90°C, and heated for 10 h; then freeze-dried, the freeze-drying temperature was -50°C, and the time was 12 h to obtain nitrogen-containing graphene The hydrogel is placed in a tube furnace, the phosphating agent sodium hypophosphite is added, the mass ratio of the nitrogen-containing graphene hydrogel to the phosphating agent is 1:10, and annealing is carried out in a nitrogen or argon atmosphere, The annealing temp...

Embodiment 2

[0047] Obtain graphene aqueous solution by the method in above-mentioned embodiment 1, add melamine ultrasonic mixing, the mass ratio of melamine and graphene is 4:1 (NPG-4), the mixed dispersion system that obtains carries out hydrothermal reaction, and hydrothermal temperature is Heating at 60°C for 10 hours, and then freeze-drying, the freeze-drying temperature is -20°C, and the time is 48 hours to obtain nitrogen-containing graphene hydrogel, which is placed in a tube furnace, and the phosphating agent sodium hypophosphite is added , the mass ratio of nitrogen-containing graphene hydrogel to phosphating agent is 1:5, annealing is carried out in a nitrogen or argon atmosphere, the annealing temperature is 100 °C, the annealing time is 4 h, and the heating rate during the annealing process is 1 °C / min; Others are the same as embodiment 1, and the nitrogen-phosphorus co-doped graphene obtained is a black gel state, and when discharging with a constant current of 50 mA / g, fig...

Embodiment 3

[0049] Obtain graphene aqueous solution by the method in above-mentioned embodiment 1, add melamine ultrasonic mixing, the mass ratio of melamine and graphene is 1:1 (NPG-1), the mixed dispersion system that obtains carries out hydrothermal reaction, and hydrothermal temperature is Heating at 90°C for 20 hours, and then freeze-drying, the temperature of freeze-drying is -30°C, and the time is 24 hours to obtain nitrogen-containing graphene hydrogel, which is placed in a tube furnace, and the phosphating agent sodium hypophosphite is added , the mass ratio of nitrogen-containing graphene hydrogel to sodium hypophosphite was 1:10, annealing was carried out in nitrogen or argon atmosphere, the annealing temperature was 400 °C, the annealing time was 1 h, and the heating rate during the annealing process was 10 ℃ / min; Others are the same as embodiment 1, and the obtained nitrogen-phosphorus co-doped graphene is in a black gel state, and when discharged at a constant current of 50 m...

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Abstract

The invention discloses a method for preparing a nitrogen and phosphorus co-doped graphene gel electrochemical sodium storage electrode, and belongs to the field of energy storage and electrochemistry. The method comprises the following steps: S1: adding graphene oxide into water, and uniformly dispersing by ultrasonic waves; S2: adding an appropriate amount of nitrogen-containing organic compoundinto a dispersing system in S1, continuing ultrasonication, placing the resulting uniform liquid in a small glass bottle to perform a hydrothermal reaction, cooling, washing, drying, phosphating treatment, and preparing to obtain nitrogen and phosphorus co-doped graphene gel; S3: using the obtained nano material as an electrochemical sodium storage active substance to prepare an electrode. The method disclosed by the invention successfully prepares the nitrogen and phosphorus co-doped graphene sodium storage electrode by using the graphene oxide and the nitrogen-containing organic compound asraw materials by hydrothermal, freeze-drying phosphating treatment methods and the like. The method has the advantages of low cost and lower energy consumption, the prepared material structure is regular, and the graphene is thin in thickness and has good sodium ion properties.

Description

technical field [0001] The invention belongs to the field of energy storage and electrochemistry, and in particular relates to a preparation method of a nitrogen and phosphorus co-doped graphene gel electrochemical sodium storage electrode. Background technique [0002] With the development of energy storage power supply and electric vehicle power supply, sodium-ion battery has become a research hotspot in recent years due to its advantages of abundant resources, low price, good safety performance, and stable electrochemical performance. However, the commercialization of anode materials for sodium-ion batteries faces some problems. Because the radius of sodium ions is 42% larger than that of lithium ions, traditional commercial lithium-ion battery anode materials are not suitable for the insertion and extraction of sodium ions. Development of high-capacity, Anode materials with high cycle stability and good performance have become very important. [0003] Graphene is a new ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/36H01M4/587H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/133H01M4/1393H01M4/364H01M4/587H01M4/624H01M10/054Y02E60/10
Inventor 李川王亚平唐华栗欢欢付琪赵康佳刘威
Owner JIANGSU UNIV
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