FeTiO3-TiO2 heterostructure loaded porous carbon nanofiber membrane material and application thereof in sodium-selenium battery

A technology of nanofiber membrane and heterogeneous structure, applied in structural parts, battery electrodes, circuits, etc., can solve the problems of no relevant reports, avoid experimental operations, inhibit dissolution-shuttle problems, and improve cycle stability.

Pending Publication Date: 2022-05-17
深圳市新锦峰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still no relevant report on how to prepare a substrate material combining polar adsorption materials and ferroelectric phase materials by a simple method.

Method used

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  • FeTiO3-TiO2 heterostructure loaded porous carbon nanofiber membrane material and application thereof in sodium-selenium battery
  • FeTiO3-TiO2 heterostructure loaded porous carbon nanofiber membrane material and application thereof in sodium-selenium battery
  • FeTiO3-TiO2 heterostructure loaded porous carbon nanofiber membrane material and application thereof in sodium-selenium battery

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preparation example Construction

[0042] see Figure 1-Figure 7 , a FeTiO 3 -TiO 2 The synthesis method and basic electrochemical performance of the porous carbon nanofiber membrane material supported by the heterogeneous structure, the preparation method includes the preparation process of the spinning solution, the obtaining process of the polymer fiber, and the 3 -TiO 2 The obtaining process of the porous carbon nanofiber membrane material supported by the heterogeneous structure, the obtaining process of the self-supporting Se / porous carbon nanofiber membrane positive electrode material, the FeTiO 3 -TiO 2 The preparation process of the porous carbon nanofiber membrane supported by the heterogeneous structure includes the operation steps of electrospinning the spinning solution:

[0043] 1) Preparation of spinning precursor solution: PAN, Pluronic F127, PS, TiO 2 and FeCl 3 Disperse in DMF solvent and stir continuously for 12 hours to prepare a uniform spinning precursor; the PAN, Pluronic F127, PS, ...

Embodiment 1

[0061] a FeTiO 3 -TiO 2 A method for synthesizing a porous carbon nanofiber membrane material supported by a heterogeneous structure, the preparation method sequentially comprising the following processes;

[0062] Preparation of spinning solution: PAN, Pluronic F127, PS, TiO 2 and FeCl 3 Disperse in DMF solvent and stir continuously for 12 hours to obtain a uniform spinning solution; the PAN, Pluronic F127, PS, TiO2, FeCl 3 The ratio to DMF is 1.05 g: 0.037 g: 0.15 g: 0.125 g: 0.125 g: 11.25 g;

[0063] Obtaining of polymer fibers: the above spinning solution was placed in a syringe, and the tip of the syringe was equipped with a 20-gauge spinning needle. The syringe was placed in the spinning machine, and the parameters such as the spinning voltage, the distance between the syringe needle and the spinning fiber receiving end, and the liquid injection speed were adjusted to obtain polymer fibers; the spinning voltage was 24 kV, and the syringe needle and the spinning fibe...

Embodiment 2

[0067] Basic content is with embodiment 1, and difference is in the preparation of spinning solution: FeCl 3 The amount is 0 g.

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Abstract

The invention relates to the field of battery materials, in particular to a preparation method of a FeTiO3-TiO2 heterostructure loaded porous carbon nanofiber membrane material and application of the FeTiO3-TiO2 heterostructure loaded porous carbon nanofiber membrane material in a sodium-selenium battery. The preparation method sequentially comprises a preparation process of a spinning solution, an acquisition process of polymer fibers, an acquisition process of a FeTiO3-TiO2 heterostructure loaded porous carbon nanofiber membrane material (FeTiO3-TiO2/CNFs), an acquisition process of a self-supporting Se/porous carbon nanofiber membrane (Se-coated FeTiO3-TiO2/CNFs) positive electrode material, and a preparation process of the self-supporting Se/porous carbon nanofiber membrane (Se-coated FeTiO3-TiO2/CNFs) positive electrode material. The problem of dissolution-shuttling is relieved through the chemical adsorption effect of TiO2 on an intermediate product polyselenide in the Na-Se battery charging and discharging process, and the problem of dissolution-shuttling is further relieved by adsorbing the polyselenide through a built-in electric field of the ferroelectric phase material FeTiO3. The built-in electric field of the ferroelectric phase material FeTiO3 can accelerate transmission of electrons on an interface and separation of charges, so that the rate capability of the Na-Se battery is improved.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a FeTiO 3 -TiO 2 Preparation method of heterostructure-supported porous carbon nanofiber membrane material and its application in sodium-selenium batteries. Background technique [0002] Na-ion battery has become a very potential energy storage object due to its low manufacturing cost and abundant sodium resources. Among many sodium-ion battery systems, sodium-selenium (Na-Se) batteries have a very high theoretical volumetric energy density (3253mAh cm -3 ), has received extensive attention from researchers in recent years. However, the practical application of Na-Se batteries faces many challenges, such as the low electronic conductivity of elemental Se (1*10 -3 S m -1 ), the dissolution-shuttle effect of the intermediate product polyselenide in the electrolyte during the charging and discharging process of Na-Se battery. [0003] Combining elemental Se with porous carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M4/62
CPCH01M4/625H01M4/485H01M4/525Y02E60/10
Inventor 许新安曾林超朱建辉
Owner 深圳市新锦峰科技有限公司
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