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Nanofiber framework-based sodium-ion battery positive electrode material and preparation method and application thereof

A technology for sodium ion batteries and positive electrode materials, which is applied in the manufacture of electrodes, battery electrodes, secondary batteries, etc. It can solve the problems of poor sodium ion diffusion kinetics, poor structural stability of carrier materials, and poor electrochemical cycle performance. Achieve reliable cycle performance, good discharge specific capacity, and increase the effect of contact area

Inactive Publication Date: 2020-08-25
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a sodium-ion battery positive electrode material based on a nanofiber skeleton and a preparation method thereof in view of the deficiencies in the above-mentioned prior art, so as to solve the problem of poor sodium ion diffusion kinetics in the sodium-ion battery positive electrode material. Key issues such as poor electrochemical cycle performance and poor structural stability of carrier materials

Method used

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  • Nanofiber framework-based sodium-ion battery positive electrode material and preparation method and application thereof
  • Nanofiber framework-based sodium-ion battery positive electrode material and preparation method and application thereof
  • Nanofiber framework-based sodium-ion battery positive electrode material and preparation method and application thereof

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preparation example Construction

[0035] See also shown in the figure, a kind of sodium ion battery cathode material and preparation method thereof based on nanofibrous skeleton of the present invention, comprises the following steps:

[0036] S1, the Na 2 CO 3 and Mn 2 o 3 As a raw material, use a certain molar ratio of Na / Mn, use alcohol as a ball milling medium, ball mill and mix evenly on a planetary ball mill, and dry and grind at a certain temperature to obtain a powder precursor; then calcined in a muffle furnace to decompose carbonate , then calcined at high temperature and cooled to room temperature to obtain Na 0.44 MnO 2 single crystal;

[0037] Sodium and manganese salts are Na 2 CO 3 , Mn2 o 3 , and grind according to n(Na) / n(Mn)=0.4~0.5 molar ratio.

[0038] The amount of alcohol in the ball milling medium is 5% to 10% of the total amount of sodium salt and manganese salt. During ball milling, the dry grinding temperature is 40 to 50°C, the grinding time is 4 to 6 hours, and the muffle f...

Embodiment 1

[0045] Weigh Na with n(Na) / n(Mn)=0.4 2 CO 3 and Mn 2 o 3 Put it into a ball mill, add 5wt% alcohol as a ball milling medium and a dispersant, dry and grind at 40° C. for 4 hours, and obtain a powdery precursor.

[0046] Calcined at 200°C for 7h in a muffle furnace to decompose carbonate, and then calcined at a high temperature of 700°C for 8h. get Na 0.44 MnO 2 single crystal material.

[0047] Configure Na with a mass fraction of 20% 0.44 MnO 2 solution, and then add 0.3g PVP to the solution to obtain an electrospinning solution, then transfer the above solution to a syringe, and prepare Na by electrospinning device 0.44 MnO 2 fiber.

[0048] The setting conditions of the electrospinning machine are electrode distance 20cm, voltage 30KV, syringe needle diameter 0.03cm, spinning dope injection speed 1ml / h. get Na 0.44 MnO 2 fiber material.

[0049] Na 0.44 MnO 2 Mix the nanofibrous material and CNTs evenly, and use a ball mill to mill for 4 hours to obtain Na ...

Embodiment 2

[0053] Weigh Na with n(Na) / n(Mn)=0.46 2 CO 3 and Mn 2 o 3 Put it into a ball mill, add 8wt% alcohol as a ball milling medium and a dispersant, and dry and grind at 45°C for 5 hours to obtain a powdery precursor;

[0054] Calcined in a muffle furnace at 300°C for 8h to decompose carbonate, and then calcined at a high temperature of 800°C for 9h to obtain Na 0.44 MnO 2 single crystal material;

[0055] Configure Na with a mass fraction of 23% 0.44 MnO 2 solution, and then add 0.4g PVP to the solution to obtain an electrospinning solution, then transfer the above solution to a syringe, and prepare Na by electrospinning device 0.44 MnO 2 fiber;

[0056] The setting conditions of the electrospinning machine are electrode distance 23cm, voltage 35KV, syringe needle diameter 0.04cm, spinning dope injection speed 1.20ml / h. get Na 0.44 MnO 2 fiber material;

[0057] Na 0.44 MnO 2 Mix the rice fiber material and CNTs evenly, and use a ball mill to mill for 4 hours to obta...

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Abstract

The invention discloses a nanofiber framework-based sodium-ion battery positive electrode material as well as a preparation method and application thereof. The method comprises the following steps: ball-milling and mixing a sodium salt, a manganese salt and alcohol, and drying and grinding to obtain a powder precursor; calcining and then cooling to room temperature to obtain a Na0.44MnO2 single crystal; preparing an electrostatic spinning solution from the Na0.44MnO2 single crystal, PVP and distilled water and preparing a Na0.44MnO2 nanofiber material by adopting an electrostatic spinning method; and forming the carbon material-coated Na0.44MnO2 sodium-ion battery positive electrode material through carbonization treatment by adopting a grinding process. The electrostatic spinning technology is adopted; experimental conditions such as temperature, atmosphere and time are regulated and controlled; the preparation process flow of a novel Na0.44MnO2@CNTs / C nanofiber composite material electrode material is explored by selecting electrostatic spinning process parameters, and the Na0.44MnO2 material prepared by the method has good specific discharge capacity and reliable cycle performance.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a sodium ion battery positive electrode material based on a nanofiber skeleton and a preparation method and application thereof. Background technique [0002] Energy and environmental issues are the most concerned issues in the world today. The excessive consumption of fossil energy and the environmental pollution caused by their combustion have become increasingly prominent, which greatly restricts the efficient and sustainable development of the future society. How to realize the modern society The efficient and pollution-free storage and conversion of energy has become an important problem to be solved in the field of scientific research. [0003] New energy storage technologies and equipment with low cost, long life, high safety and high energy density have become an important solution to replace traditional fossil energy; therefore, exploring new bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/04H01M4/131H01M10/04H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/0402H01M4/131H01M4/505H01M4/625H01M4/628H01M10/0427H01M10/054H01M2004/028Y02E60/10Y02P70/50
Inventor 王亮亮齐宁王娟杨垒王萌黄会星杨乃兴邓七九
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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