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Preparation method and application of three-dimensional self-supporting nitrogen-doped carbon sodium ion negative electrode material

A nitrogen-doped carbon and negative electrode material technology, applied in the field of electrochemical power supply, can solve the problems of high cost, poor safety of carbon materials, and poor cycle stability

Active Publication Date: 2021-04-30
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem solved by the present invention is to overcome the defects of existing carbon materials such as poor safety, poor cycle stability, high cost and unsuitable preparation process for industrialized production

Method used

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  • Preparation method and application of three-dimensional self-supporting nitrogen-doped carbon sodium ion negative electrode material
  • Preparation method and application of three-dimensional self-supporting nitrogen-doped carbon sodium ion negative electrode material
  • Preparation method and application of three-dimensional self-supporting nitrogen-doped carbon sodium ion negative electrode material

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Embodiment 1

[0036] (1) Preparation of three-dimensional carbon anode materials

[0037] A method for preparing a three-dimensional self-supporting nitrogen-doped carbon-sodium ion negative electrode material, comprising the following steps:

[0038] (1) Preparation of ZIF-8: Take a certain amount of Zn(NO 3 ) 2 ·6H 2O was dissolved in 100ml of methanol to obtain solution A; a certain amount of composite ligand was dissolved in 100ml of methanol to obtain solution B, wherein the composite ligand was composed of a rigid ligand and a flexible ligand in a molar ratio of 1:1. The combination of rigid ligand (2,2-bipyridyl) and flexible ligand (1,2-dipyridylethane) can not only ensure the strength, prevent the collapse of holes, but also improve the flexibility of the material; take a certain amount Poly N-isopropylacrylamide was dissolved in 100ml methanol to obtain solution C; wherein, Zn(NO 3 ) 2 ·6H 2 O, the molar ratio of complex ligand and poly-N-isopropylacrylamide is 1:4:1, the so...

Embodiment 2

[0051] This embodiment is basically the same as Embodiment 1, the difference is:

[0052] A method for preparing a three-dimensional self-supporting nitrogen-doped carbon-sodium ion negative electrode material, comprising the following steps:

[0053] (1) Preparation of ZIF-8: Take a certain amount of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 100ml of methanol to obtain solution A; a certain amount of composite ligand was dissolved in 100ml of methanol to obtain solution B, wherein the composite ligand was composed of a rigid ligand and a flexible ligand in a molar ratio of 1:1. The combination of rigid ligand (2,2-bipyridyl) and flexible ligand (1,2-dipyridylethane) can not only ensure the strength, prevent the collapse of holes, but also improve the flexibility of the material; take a certain amount Poly N-isopropylacrylamide was dissolved in 100ml methanol to obtain solution C; wherein, Zn(NO 3 ) 2 ·6H 2 O, the molar ratio of composite ligand and poly-N-isopropylacrylamide...

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Abstract

The invention discloses a preparation method and application of a three-dimensional self-supporting nitrogen-doped carbon-sodium ion negative electrode material. The preparation method comprises: (1) preparation of ZIF-8; (2) preparation of electrospinning; (3) annealing and carbonization. The present invention can realize reversible intercalation and deintercalation of sodium, presents ramp-type voltage behavior, solves the secondary battery anode material prepared by the existing method, improves battery safety, improves low specific capacity, poor stability, poor cycle performance, graphite cannot intercalate sodium and other problems . The negative electrode material is a nitrogen-doped three-dimensional self-supporting carbon material, can be directly used as an electrode, has no binder, low cost, simple method, is suitable for large-scale production, and has application potential.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and in particular relates to a preparation method and application of a three-dimensional self-supporting nitrogen-doped carbon-sodium ion negative electrode material. Background technique [0002] Due to its high energy density and good cycle stability, lithium-ion batteries have attracted much attention since they were proposed in 1970. In 1991, SONY Corporation industrialized them and became even more famous. However, the application of lithium has encountered a bottleneck due to the scarcity of crustal resources. Lithium is a limited resource, which, like oil, is unevenly distributed around the world. At this time, sodium, which is in the same main group as it, has attracted attention. In contrast, they have similar chemical properties, with a crustal abundance of up to 2.75% for sodium, much higher than 0.0065% for lithium, greatly reducing the cost. Compared with lithium resour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525H01M10/054
CPCH01M4/587H01M4/62H01M10/0525H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 郑自建苏琪王正帮曾思远
Owner HUBEI UNIV
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