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Sodium ion battery negative electrode material and preparation method thereof

A sodium ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of poor conductivity, large volume expansion, cycle stability and rate of molybdenum disulfide materials Poor performance and other problems, to achieve the effect of improving cycle rate performance, low cost, and high specific surface area

Active Publication Date: 2021-11-09
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molybdenum disulfide material has poor conductivity and its volume expansion is too large during the charge and discharge process, resulting in poor cycle stability and rate performance.

Method used

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  • Sodium ion battery negative electrode material and preparation method thereof
  • Sodium ion battery negative electrode material and preparation method thereof
  • Sodium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Put 0.1g of copper tartrate in a quartz boat, pave it evenly, then place it in a tube furnace, feed nitrogen, raise the temperature to 280°C under the protection of nitrogen, then stop feeding nitrogen, and feed acetylene gas, and keep it warm for 1 h, then stop feeding acetylene gas, feed nitrogen gas, cool to room temperature under the protection of nitrogen gas, take out the sample, and obtain helical carbon nanofibers.

[0035] (2) Place the helical carbon nanofibers obtained in step (1) in a tube furnace, and raise the temperature to 700°C under the protection of nitrogen, and then keep warm for 2 hours to obtain carbonized helical carbon nanofibers, namely N-CNF.

[0036] (3) Acidify the carbonized helical nanocarbon fiber obtained in step (2) with concentrated nitric acid (the concentrated nitric acid completely submerges the carbonized helical nanocarbon fiber). After acidifying for 2 hours, filter it with a sand core funnel and wash it repeatedly with distil...

Embodiment 2

[0040] Accurately weigh 1g of CNF, 2g of ammonium molybdate and 10g of thiourea obtained in step (3) of Example 1, add them into a beaker in turn, stir for 1h, then place in a reaction kettle, heat to 280°C and keep for 18h. After cooling, use a centrifuge to centrifuge 6 times until the solution is neutral, then dry it in a freeze dryer, and finally place it in a tube furnace, raise the temperature to 500°C under the protection of nitrogen, and keep it warm for 3 hours to obtain the negative electrode of the sodium ion battery Material, denoted as 1:2-CNF / MoS 2 .

[0041] N-CNF, CNF, 1:1.5-CNF / MoS 2 、1:2-CNF / MoS 2 The cycle performance graph at 100mA / g current density is as follows image 3 shown by image 3 It can be seen that the specific capacity of the helical carbon fiber can be significantly improved by acidification treatment, and the grafted MoS 2 , electrode materials with high specific capacity and high cycle stability can be obtained. 1:1.5-CNF / MoS 2 It has ...

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Abstract

The invention discloses a sodium ion battery negative electrode material and a preparation method thereof. The preparation method comprises the steps that spiral nanometer carbon fibers are prepared at low temperature through a chemical vapor deposition method, then the spiral nanometer carbon fibers are carbonized and acidified in sequence, finally, a molybdenum source, a sulfur source and the acidified spiral nanometer carbon fibers are mixed, and then the mixture is put into a reaction kettle for hydrothermal reaction, and then is subjected to centrifuging, freeze-drying and annealing to obtain the sodium ion battery negative electrode material. The sodium ion battery negative electrode material prepared by the method has good conductivity and cycling stability.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a negative electrode material of a sodium ion battery and a preparation method thereof. Background technique [0002] Due to the increasing shortage of non-renewable energy sources such as oil, and the tail gas produced by burning oil is becoming more and more serious to the environment. Researchers from all over the world are looking for clean energy and new energy devices that use energy more efficiently. As a high specific energy battery system, lithium-ion batteries have developed rapidly in the fields of portable electronic products, power tools and electric vehicles. However, limited by lithium resources, it may not be able to support the development of large-scale energy storage power sources. Therefore, the development of an advanced battery system with abundant resources and low cost is an inevitable way out for large-scale power storage applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/127D06M11/53H01M4/58H01M4/62H01M10/054B82Y40/00B82Y30/00D06M11/64D06M101/40
CPCD01F9/1275D06M11/53H01M4/625H01M4/5815H01M10/054B82Y30/00B82Y40/00D06M2101/40Y02E60/10
Inventor 陈建卿龙李瑞岳晨曦唐利平
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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