Chargeable and dischargeable seawater battery negative electrode material

Abstract

The invention discloses a seawater battery negative electrode capable of being charged and discharged. According to the invention, one or more of tungsten trioxide and titanium disulfide materials are used as negative electrode active materials, energy storage is carried out in an ion intercalation / deintercalation mode, and the negative electrode material has the advantages of high specific capacity, good rate capability, small voltage polarization, good environmental friendliness and the like, can be used as a novel negative electrode material of a chargeable and dischargeable seawater battery, and can be used as a negative electrode material of the chargeable and dischargeable seawater battery. And the method has important significance for developing a green and sustainable electrochemical energy storage technology.

Description

Technical Field

[0001] The invention belongs to the field of electrochemical energy storage technology and new material applications, and specifically relates to a rechargeable and dischargeable seawater battery negative electrode material and a battery. Background Art

[0002] Seawater is the most ideal battery electrolyte, with the advantages of zero cost, safety and sustainability. The current seawater batteries are mainly primary batteries, which cannot be repeatedly charged and discharged. Due to the intermittent characteristics of large-scale renewable energy such as wind power and solar energy, advanced energy storage devices are required for coordinated use. Large-scale energy storage devices need to have the characteristics of low cost, long cycle life and good safety. There are very few types of negative electrode materials for rechargeable seawater batteries (i.e., secondary seawater batteries) that have been developed, mainly including lattice-expanded titanium dioxide (Adv. Mater., 2024, 2312343), etc., but the preparation method is still relatively complicated. It is of great significance to develop high-capacity and easy-to-prepare negative electrode materials that can be used for rechargeable and dischargeable seawater batteries. Tungsten trioxide and titanium disulfide materials have potential application prospects in the fields of photocatalysis, lithium-ion batteries, zinc-ion batteries, etc. However, to date, there have been no reports of tungsten trioxide and titanium disulfide being used to make negative electrode materials for rechargeable and dischargeable seawater batteries.

[0003] The present invention develops and designs tungsten trioxide and titanium disulfide as negative electrode materials for rechargeable and dischargeable seawater batteries, which have the advantages of high specific capacity, good rate performance, small voltage polarization, and good environmental friendliness. They are expected to be applied to large-scale storage of renewable energy and marine equipment. Summary of the invention

[0004] The present invention is applicable to the field of rechargeable and dischargeable seawater batteries, and uses tungsten trioxide and titanium disulfide as negative electrode materials of rechargeable and dischargeable seawater batteries, including such materials after modification or in non-stoichiometric ratio. The present invention is the first to apply tungsten trioxide and titanium disulfide materials in the field of negative electrodes of rechargeable and dischargeable seawater batteries.

[0005] The invention provides a negative electrode material for a rechargeable and dischargeable seawater battery, which uses one or more of tungsten trioxide and titanium disulfide as negative electrode active materials.

[0006] Furthermore, in the negative electrode material, either tungsten trioxide or titanium disulfide is the only negative electrode active ingredient.

[0007] The present invention also provides a rechargeable and dischargeable seawater battery, which adopts the negative electrode material as described in any one of the above items.

[0008] In addition, the present invention also provides a new use of tungsten trioxide as a negative electrode material for a rechargeable and dischargeable seawater battery.

[0009] In addition, the present invention also provides a new use of titanium disulfide as a negative electrode material for a rechargeable and dischargeable seawater battery.

[0010] Furthermore, the tungsten trioxide includes defect-free tungsten trioxide, tungsten trioxide containing crystal defects or modified tungsten trioxide, and the modification is doped with other elements or compounded with other materials; the titanium disulfide includes defect-free titanium disulfide, titanium disulfide containing crystal defects or modified titanium disulfide, and the modification is doped with other elements or compounded with other materials.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1) These materials do not require unique preparation methods and are compatible with commercial materials / existing large-scale preparation methods, which can reduce manufacturing costs;

[0013] 2) Tungsten trioxide and titanium disulfide store energy through ion embedding / de-embedding, and have the advantages of good rate performance, small voltage polarization, good environmental friendliness, and high specific capacity. For example, the discharge specific capacity of titanium disulfide can reach 135mAh / g (current density 7.5A / g). BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a scanning electron microscope photograph of the tungsten trioxide material of Example 1 of the present invention;

[0015] Figure 2 The X-ray diffraction pattern of the tungsten trioxide material of Example 1 of the present invention;

[0016] Figure 3 This is the constant current charge and discharge curve of the tungsten trioxide negative electrode material of Example 1 of the present invention;

[0017] Figure 4 is the X-ray diffraction pattern of the titanium disulfide material of Example 2 of the present invention;

[0018] Figure 5 This is the constant current charge and discharge curve of the titanium disulfide negative electrode material of Example 2 of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose and technical solution of the present invention clearer and easier to understand, the present invention is described in detail below in conjunction with embodiments. It is worth noting that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of protection of the present invention. The technician can make some simple deductions, improvements or replacements based on the concept of the present invention. These deductions, improvements or replacement schemes also belong to the scope of the claims of the present invention.

[0020] Example 1

[0021] Purchase commercial tungsten trioxide, the scanning electron microscope photo of which is as follows Figure 1 As shown, the powder particles are micrometer-sized; Figure 2 The X-ray diffraction pattern of the material proves that it is tungsten trioxide. The tungsten trioxide material is used as the negative electrode active material, mixed evenly with the conductive agent and the binder in a mass ratio of 7:2:1, and coated on the current collector to obtain a working electrode; its energy storage performance is tested in a three-electrode system, the electrolyte is natural seawater (taken from the South China Sea), the reference electrode is a silver / silver chloride electrode, and the counter electrode is a Pt sheet. The charge and discharge curves of the two cycles are shown in Figure 2. Figure 3 As shown, the discharge capacity at a current density of 6.12 A / g is as high as 85 mAh / g, and it has the characteristics of repeated charge and discharge, and can be used as a high-performance negative electrode material for secondary seawater batteries.

[0022] Example 2

[0023] Buy commercial titanium disulfide, Figure 4 The X-ray diffraction pattern of the titanium disulfide material proves that it is a titanium disulfide material. The titanium disulfide material is used as the negative electrode active material, mixed evenly with the conductive agent and the adhesive in a mass ratio of 7:2:1, and coated on the current collector to obtain a working electrode; its energy storage performance is tested in a three-electrode system, the electrolyte is natural seawater (taken from the South China Sea), the reference electrode is a silver / silver chloride electrode, and the counter electrode is a Pt sheet. The charge and discharge curves of the two cycles are shown in Figure 2. Figure 5 As shown, the discharge capacity at a current density of 7.5A / g is as high as 135mAh / g, and it has the ability to be repeatedly charged and discharged, and can be used as a high-performance negative electrode material for secondary seawater batteries.

[0024] The present invention illustrates the detailed method of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed method, that is, it does not mean that the present invention must rely on the above-mentioned detailed method to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, and the selection of specific methods and conditions, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A negative electrode material for a rechargeable seawater battery, characterized in that: One or more of tungsten trioxide and titanium disulfide are used as negative electrode active materials.

2. The negative electrode material for a rechargeable and dischargeable seawater battery according to claim 1, characterized in that: The negative electrode material uses either tungsten trioxide or titanium disulfide as the only negative electrode active component.

3. The negative electrode material for a rechargeable and dischargeable seawater battery according to claim 1, characterized in that: The tungsten trioxide includes defect-free tungsten trioxide, tungsten trioxide containing crystal defects or modified tungsten trioxide, and the titanium disulfide includes defect-free titanium disulfide, titanium disulfide containing crystal defects or modified titanium disulfide.

4. A rechargeable seawater battery, characterized in that: The negative electrode material according to any one of claims 1 to 3 is used.

5. New use of tungsten trioxide as negative electrode material for rechargeable and dischargeable seawater batteries.

6. The new use according to claim 5, characterized in that: The tungsten trioxide is defect-free tungsten trioxide, tungsten trioxide containing crystal defects or modified tungsten trioxide.

7. New use of titanium disulfide as negative electrode material for rechargeable and dischargeable seawater batteries.

8. The new use according to claim 7, characterized in that: The titanium disulfide includes defect-free titanium disulfide, titanium disulfide containing crystal defects or modified titanium disulfide.

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