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Sodium-based double ion battery and preparation method thereof

A dual-ion, sodium-ion technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of poor performance of sodium-based dual-ion batteries, and achieve the effect of being conducive to charge transfer and good specific capacity

Pending Publication Date: 2019-11-15
GUANGDONG UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to provide a sodium-based double-ion battery and its preparation method to solve the problem of poor performance of the existing sodium-based double-ion battery

Method used

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  • Sodium-based double ion battery and preparation method thereof

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preparation example Construction

[0055] The present invention also provides a method for preparing the sodium-based double-ion battery as described above, comprising the following steps:

[0056] Under the protection of an inert gas, the positive electrode, separator and negative electrode are stacked in sequence, and the electrolyte is added dropwise to completely infiltrate the separator;

[0057] The stacked positive electrode, separator and negative electrode are packaged into a battery casing to prepare a sodium-based double-ion battery.

[0058] In a preferred embodiment of the present invention, the preparation method of the sodium-based double-ion battery specifically includes the following steps:

[0059] 1) Preparation of negative electrode:

[0060] The conductive agent, the binder and the negative electrode active material are ground, then rolled into sheets and coated on a metal foam material of a required size, compacted and then vacuum-dried to obtain a negative electrode.

[0061] 2) Prepara...

Embodiment 1

[0073] In Example 1, a sodium-based double-ion battery was adopted, including a negative electrode, a separator, an electrolyte, and a positive electrode.

[0074] The specific material composition and preparation method of the sodium-based double-ion battery are as follows:

[0075] 1) Preparation of negative electrode: After fully grinding 1g of vanadium disulfide, 0.5g of conductive carbon black and 0.17g of polytetrafluoroethylene aqueous phase dispersion, roll it into a sheet, and then apply it on the nickel foam with a diameter of 12mm, and compact it And vacuum dried, as a negative electrode backup.

[0076] 2) Preparation of the separator: the glass fiber separator was cut into discs with a diameter of 19 mm, and was used as a separator after drying.

[0077] 3) Prepare the electrolyte: mix ethylene carbonate, dimethyl carbonate and dimethyl carbonate according to the volume ratio of 1:1:1, add sodium perchlorate and fluoroethylene carbonate, and control the concentra...

Embodiment 2

[0081] This embodiment provides a sodium-based dual-ion battery, wherein vanadium tetrasulfide is used as the negative electrode active material, and the others are the same as in embodiment 1.

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Abstract

The invention discloses a sodium-based double ion battery and a preparation method thereof. The sodium-based double ion battery comprises a positive electrode, a negative electrode, and a diaphragm and electrolyte solution between the positive electrode and the negative electrode. The negative electrode comprises a negative electrode active material for reversibly accommodating cations. The negative electrode active material is a two-dimensional material. The cations are sodium ions, and the electrolyte solution is solution containing sodium ions. The sodium-based double-ion battery provided by the invention uses a two-dimensional material as a negative electrode active material. The two-dimensional material provides a loosely stacked frame of which the distance between layers is far larger than the ion diameter of the sodium ions. The large open channels between layers provide potential sites for the intercalation and de-intercalation of alkali metals, and have metal properties conducive to the transfer of charges. Therefore, the sodium-based double ion battery provided by the invention has good specific capacity, energy density, power density and cycle life.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a sodium-based double-ion battery and a preparation method thereof. Background technique [0002] Dual-ion batteries (DIBs) have attracted increasing attention in the field of electrical energy storage devices. The electrical energy storage of such an electrical energy storage device is based on the storage of anions at the positive electrode and the storage of cations at the negative electrode, respectively. In addition to the positive and negative electrodes, the electrolyte is also an important part of the dual-ion battery. Among the large cation families, lithium is the lightest charge carrier in nonaqueous electrolyte systems. However, lithium reserves are limited globally. Therefore, sodium, which has similar physical and chemical properties to lithium and is abundant in reserves, has attracted more and more attention as an alternative. [0003] However, in the existi...

Claims

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Application Information

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IPC IPC(8): H01M10/054H01M10/058
CPCH01M10/054H01M10/058Y02E60/10Y02P70/50
Inventor 郑程陈耀武郭祝简邦权邓兴荣凌绍滔
Owner GUANGDONG UNIV OF TECH
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