Electrolyte containing xylitol and its preparation method and application
By adding xylitol to the electrolyte of zinc-ion batteries, the problems of dendrite growth and hydrogen generation on the surface of zinc anodes were solved, improving the cycle life and stability of zinc-ion batteries, simplifying the manufacturing process and reducing costs.
Patent Information
- Application Number
- CN202211209854.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-09-30
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2042-09-30
AI Technical Summary
Existing zinc-ion batteries have inherent stability issues during reversible charge-discharge processes, especially the growth of dendrites, hydrogen generation, and the formation of other byproducts on the zinc anode surface, which affect their cycle life and safety.
Adding xylitol to the electrolyte of a zinc-ion battery weakens electrostatic interactions by forming hydrogen bonds with water molecules in the zinc ion solvent sheath, thus constructing a shielding layer to inhibit dendrite growth and improve zinc ion transport efficiency.
The addition of xylitol to the electrolyte improved the cycle life and stability of zinc-ion batteries, simplified the manufacturing process, and reduced costs.
Smart Images
Figure CN115548473B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aqueous zinc-ion battery electrolyte technology, and particularly to an electrolyte containing xylitol, its preparation method, and its application. Background Technology
[0002] Xylitol is a sweetener extracted from related plant materials. It is widely distributed in nature and can be obtained in large quantities through low-cost processes. Furthermore, xylitol molecules have excellent water solubility and can form hydrogen bonds with water molecules through the polyhydroxy groups in their molecular chain, making it a green, environmentally friendly, and biodegradable natural resource. Therefore, exploring more applications of xylitol in cutting-edge scientific research fields has high research value.
[0003] Currently, energy shortages and environmental pollution are driving global attention to new technologies in energy storage. While the commercialization of lithium-ion batteries has brought immense convenience, issues such as high cost and low safety remain. In contrast, aqueous zinc-ion batteries offer higher capacity (5855 Ah / L for zinc anode and 2061 Ah / L for lithium anode), lower material assembly costs, and safer operating processes, making them an ideal alternative to lithium batteries. However, to achieve large-scale application of zinc-ion batteries, the inherent stability issues during reversible charge-discharge processes must be resolved.
[0004] To develop advanced zinc-ion batteries with long cycle life, the key lies in achieving stable electrochemical reactions at the zinc anode. This necessitates suppressing dendrite growth on the zinc anode surface and avoiding the generation of hydrogen ether (HER) and other associated byproducts (zinc hydroxide, basic zinc sulfate, etc.) during electroplating / stripping. Current solutions for maintaining stable zinc anode operation can be categorized into optimizing the electrolyte solvent sheath structure and modifying the electrode surface structure. Since the electrolyte plays a crucial role in bridging electrodes and guiding ion transport in zinc-based energy storage devices, developing a simple electrolyte preparation process is considered an ideal way to extend relevant scientific findings to practical applications. Summary of the Invention
[0005] The purpose of this invention is to provide a xylitol-containing electrolyte for stabilizing the negative electrode of a zinc-ion battery and its preparation method. By adding xylitol to the electrolyte, this invention enables zinc-ion batteries prepared using this electrolyte to exhibit excellent cycle life, long cycle stability, and specific capacity. Furthermore, the preparation process is simple, safe, environmentally friendly, and low-cost.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] One of the technical solutions of the present invention is to provide an application of an electrolyte containing xylitol in a zinc-ion battery, wherein the components of the electrolyte containing xylitol include zinc sulfate, xylitol and water.
[0008] Preferably, the concentration of xylitol in the electrolyte containing xylitol is 0.01-1 mol / L, and the concentration of zinc sulfate is 1-3 mol / L.
[0009] This invention adds xylitol to the ZnSO4 electrolyte. The xylitol molecules in the system preferentially interact with water molecules in the zinc ion solvent sheath by forming hydrogen bonds. On the one hand, this weakens the electrostatic interaction between zinc ions and sulfate ions, thereby increasing the zinc ion transfer number and the overpotential of HER. On the other hand, xylitol molecules can preferentially adsorb on the zinc anode surface to form a shielding layer, thereby preventing the two-dimensional diffusion of subsequently deposited zinc ions and inhibiting dendrite growth.
[0010] Preferably, the method for preparing the xylitol-containing electrolyte includes the following steps:
[0011] Zinc sulfate, xylitol, and water are mixed to obtain an electrolyte containing xylitol.
[0012] This invention utilizes a novel electrolyte containing a small amount of xylitol, a natural product, as an additive to stabilize the negative electrode of a zinc-ion battery. The invention also constructs an electrode testing system and a zinc-ion battery energy storage system using this novel electrolyte.
[0013] Preferably, the electrolyte containing xylitol is used as the electrolyte for a symmetrical zinc battery, an asymmetrical copper-zinc battery, or a zinc-ion full battery.
[0014] Preferably, the symmetrical zinc battery comprises two parallel zinc foils, a glass fiber paper separator, and the aforementioned electrolyte containing xylitol.
[0015] Preferably, the asymmetric copper-zinc battery includes zinc foil, copper foil, glass fiber paper separator, and the above-mentioned electrolyte containing xylitol.
[0016] Preferably, the zinc-ion full battery includes NaV3O8, zinc foil, glass fiber paper separator, and the above-mentioned electrolyte containing xylitol.
[0017] This invention utilizes a glass fiber paper separator. The glass fiber paper separator in the system only needs to separate the positive and negative electrodes. Compared to solutions with different electrolytes for the positive and negative electrodes, the separator in this application allows the electrolyte to flow normally between the positive and negative electrodes, thereby effectively improving the positive and negative ion transport efficiency.
[0018] Preferably, a symmetrical zinc battery includes two parallel zinc foils, a glass fiber paper separator, and the aforementioned electrolyte containing xylitol.
[0019] Preferably, an asymmetric copper-zinc battery includes zinc foil, copper foil, a glass fiber paper separator, and the aforementioned electrolyte containing xylitol.
[0020] Preferably, a zinc-ion full battery includes NaV3O8, zinc foil, glass fiber paper separator, and the above-mentioned electrolyte containing xylitol.
[0021] This invention discloses the following electrochemical testing process:
[0022] The xylitol molecules in the electrolyte provided by this invention can directionally reconstruct the electrolyte hydrogen bond network and regulate zinc ion transport and deposition, significantly improving the electrochemical performance of zinc-ion batteries. This method offers advantages such as high reproducibility, simple synthesis process, inexpensive raw materials, and low battery manufacturing cost. This mixed electrolyte can significantly improve the electrochemical performance of zinc-ion batteries. Analysis of the zinc ion transfer number in the assembled Zn‖Zn symmetric battery using chronoamperometry and AC impedance spectroscopy reveals that xylitol helps weaken the electrostatic interaction between cations and anions, thereby improving zinc ion transport efficiency. At a current density of 1 mA / cm²... 2 With an areal capacity density of 1 mAh / cm³ 2 Studies of SEM images, XRD patterns, and cycle times of symmetric cells on Zn foil surfaces reveal that xylitol can significantly reduce dendrite growth, inhibit the formation of byproducts, and extend cycle life.
[0023] By using a current density of 1 mA / cm 2 The areal capacity density is 1 mAh / cm³. 2 By assembling Zn||Cu half-cells containing ZnSO4 electrolytes with different concentrations of xylitol and testing the coulombic efficiency of the half-cells, it can be found that xylitol can greatly improve the charge and discharge efficiency of the battery and improve battery performance.
[0024] By assembling full cells (Zn‖NaV3O8) with and without xylitol electrolyte at a current density of 0.5 A / g, it was found that adding xylitol to the electrolyte can significantly improve the specific capacity and long-term cycling stability.
[0025] Compared with existing conventional electrolytes, the beneficial technical effects of the present invention are as follows:
[0026] The electrolyte additive used in this invention is xylitol, a natural resource. The raw material is green, non-toxic, and inexpensive. Furthermore, it can increase the transfer number of zinc ions in the electrolyte, stabilize the negative electrode of the zinc-ion battery, prevent dendrite growth during electroplating / stripping, and avoid corrosion of zinc sheets and adverse side reactions such as HER.
[0027] The Zn||Zn symmetric cell constructed using xylitol electrolyte in this invention, by measuring chronoamperometry and AC impedance, yielded a zinc ion transfer number of 0.63, which is superior to the system using pure zinc sulfate electrolyte (0.30). This was achieved at a current density of 1 mA / cm². 2 With an areal capacity density of 1 mAh / cm³ 2 Under these conditions, the symmetrical battery exhibits excellent cycle stability, with a stable cycle time exceeding 1100 hours, while the battery using pure zinc sulfate electrolyte will short-circuit after about 200 hours of operation.
[0028] The semi-symmetric cell constructed using xylitol electrolyte in this invention can be measured using a Zn‖Cu asymmetric cell at a current density of 1 mA / cm². 2 and area capacity of 1mAh / cm 2 Under these conditions, the battery can stably cycle for more than 100 times while maintaining an ultra-high coulombic efficiency of 99.53%.
[0029] The full cell (Zn‖NaV3O8) constructed using xylitol electrolyte in this invention exhibits higher specific capacity, rate performance, and cycle stability than the full cell constructed using pure zinc sulfate electrolyte.
[0030] This invention's method of constructing a zinc-ion battery using xylitol electrolyte simplifies battery assembly compared to methods using different electrolytes for the positive and negative electrodes, and eliminates the need for separation of the positive and negative electrode electrolytes. The electrolyte in this invention can effectively act on both electrodes of the battery. Xylitol exhibits excellent cycle stability in Zn||Zn symmetric cells, effectively suppressing dendrite growth and the HER reaction. Furthermore, compared to methods using glucose as an additive, the relatively small polyhydroxyl molecular chain of xylitol provides multiple hydrogen bonding sites while reducing solution viscosity, effectively increasing the zinc ion transfer number. Attached Figure Description
[0031] Figure 1 The XRD patterns of the Zn negative electrode in the Zn‖Zn symmetrical cell in Example 1 before and after cycling are shown to verify the effect.
[0032] Figure 2 HER diagram of the Zn‖Zn symmetric cell assembled with the electrolytes prepared in Example 1 and Comparative Example 1 to verify the effect.
[0033] Figure 3The images show SEM images of the Zn negative electrode of the Zn‖Zn symmetric battery in Example 1 after cycling, to verify the effectiveness. In the images, a is a 10-cycle image of the electrolyte prepared in Example 1, b is a 100-cycle image of the electrolyte prepared in Example 1, c is a 10-cycle image of the electrolyte prepared in Comparative Example 1, and d is a 100-cycle image of the electrolyte prepared in Comparative Example 1.
[0034] Figure 4 The NMR spectrum of the electrolyte in the Zn‖Zn symmetric battery in Example 1 is used to verify the effect.
[0035] Figure 5 The Raman spectra of the electrolyte in the Zn‖Zn symmetric cell assembled using the electrolytes prepared in Examples 1-3 and Comparative Example 1 are shown in Example 1 to verify the effectiveness.
[0036] Figure 6 In-situ digital images of dendrite growth on the surface of the Zn anode sheet in the Zn||Zn symmetric cell in Example 1 are used to verify the effect. Among them, a is an in-situ digital image of the Zn||Zn symmetric cell assembled with the electrolyte prepared in Comparative Example 1, and b is an in-situ digital image of the Zn||Zn symmetric cell assembled with the electrolyte prepared in Example 1.
[0037] Figure 7 The cycling performance diagram of the Zn‖Zn symmetric battery assembled with the electrolytes prepared in Example 1 and Comparative Example 1 is shown in Example 1 to verify the effect.
[0038] Figure 8 The coulombic efficiency diagram of the Zn‖Cu asymmetric battery assembled with the electrolytes prepared in Example 1 and Comparative Example 1 is shown in Example 1 to verify the effect.
[0039] Figure 9 Long-cycle diagram of the Zn‖NaV3O8 full cell assembled with the electrolytes prepared in Example 1 and Comparative Example 1 to verify the effect.
[0040] Figure 10 The rate performance of the Zn‖NaV3O8 full cell assembled with the electrolytes prepared in Example 1 and Comparative Example 1 is shown in Example 1 to verify the effect.
[0041] Figure 11 The diagram shows the zinc ion transfer numbers of the Zn||Zn symmetric battery in Example 1 to verify the effectiveness. In the diagram, a represents the zinc ion transfer number of the Zn||Zn symmetric battery assembled with the electrolyte prepared in Example 1, b represents the zinc ion transfer number of the Zn||Zn symmetric battery assembled with the electrolyte prepared in Comparative Example 4, and c represents the zinc ion transfer number of the Zn||Zn symmetric battery assembled with the electrolyte prepared in Comparative Example 1.
[0042] Figure 12The cycling performance of the Zn||Zn symmetric cell in Example 1 is shown to verify the effect. Among them, a is the cycling performance of the Zn||Zn symmetric cell assembled with the electrolyte prepared in Comparative Example 2, and b is the cycling performance of the Zn||Zn symmetric cell assembled with the electrolyte prepared in Comparative Example 3. Detailed Implementation
[0043] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention. It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the present invention.
[0044] Furthermore, regarding the numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, are also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.
[0045] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar to or equivalent to those described herein may be used in the implementation or testing of this invention.
[0046] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.
[0047] The X-ray diffractometer used in this embodiment of the invention is a Bruker D8 X-ray diffractometer (USA), and the scanning electron microscope is a Zeiss GeminiSEM 300 field emission scanning electron microscope (FE-SEM) (Germany). The nuclear magnetic resonance spectrometer is an Agilent 600M. The Raman spectrometer is a Renishaw inVia Reflex (UK).
[0048] Unless otherwise specified, the medicines, reagents, etc. used in the following examples can be obtained through commercial channels.
[0049] The following examples further illustrate the method for preparing zinc sulfate electrolyte containing xylitol in this invention.
[0050] Example 1
[0051] A xylitol-containing electrolyte for stabilizing the negative electrode of a zinc-ion battery is prepared by the following steps:
[0052] (1) Take 5.751g of zinc sulfate, disperse it in deionized water and make up to 10 mL of solution. Then, use magnetic stirring and ultrasonic dispersion at room temperature to accelerate dissolution and obtain a 2mol / L zinc sulfate solution.
[0053] (2) Take 0.152g of xylitol and add it to a 2mol / L zinc sulfate solution. Stir magnetically and disperse ultrasonically at room temperature to accelerate dissolution. Remove insoluble impurities with a microporous filter membrane to obtain a zinc sulfate electrolyte containing 0.1mol / L xylitol.
[0054] Example 2
[0055] Compared with Example 1, the difference is that the mass of xylitol added is 0.0152g, and a zinc sulfate electrolyte containing 0.01mol / L xylitol is prepared.
[0056] Example 3
[0057] Compared with Example 1, the difference is that the mass of xylitol added is 1.52g, and a zinc sulfate electrolyte containing 1mol / L xylitol is prepared.
[0058] Comparative Example 1
[0059] Compared with Example 1, the difference is that the mass of xylitol added is 0g, and a zinc sulfate electrolyte without xylitol is prepared.
[0060] Comparative Example 2
[0061] Compared with Example 1, the difference is that the added mass of zinc sulfate is 8.626 g, and a zinc sulfate electrolyte containing 3 mol / L zinc sulfate and 0.1 mol / L xylitol is prepared.
[0062] Comparative Example 3
[0063] Compared with Example 1, the difference is that the added mass of zinc sulfate is 2.875g, and a zinc sulfate electrolyte containing 1mol / L zinc sulfate and 0.1mol / L xylitol is prepared.
[0064] Comparative Example 4
[0065] Compared with Example 1, the difference is that xylitol is replaced with glucose of equal molar concentration to prepare a zinc sulfate electrolyte containing 3 mol / L zinc sulfate and 0.1 mol / L glucose additive.
[0066] Example 1 of effect verification
[0067] (1) Construct Zn‖Zn symmetric cells using the electrolytes prepared in each embodiment and test their performance.
[0068] Using the electrolytes prepared in Examples 1-3 or Comparative Example 1, a Zn||Zn symmetric cell consisting of two symmetrical zinc foil electrodes, a glass fiber paper separator, and an electrolyte was prepared, and the Zn||Zn symmetric cell was tested at a current density of 1 mA / cm². 2 With an areal capacity density of 1 mAh / cm³ 2 The SEM image, XRD pattern, NMR pattern, Raman pattern, in-situ digital photograph, and cycle performance diagram of the Zn anode sheet are shown.
[0069] Figure 1 The XRD patterns of each zinc anode in a Zn‖Zn symmetrical cell after 100 cycles are shown. The x-axis represents the diffraction angle (2θ), and the y-axis represents the relative diffraction intensity. Figure 1 It can be seen that the XRD pattern of the battery composed only of 2M ZnSO4 electrolyte shows a clear peak of the byproduct (Zn(OH)2)3(ZnSO4)-(H2O)5. However, after adding 0.1 mol / L xylitol, no byproduct peak was observed in the XRD pattern, proving that xylitol can effectively inhibit the formation of byproducts.
[0070] Figure 2 The HER diagrams for the electrolyte in a Zn||Zn symmetric cell before and after the addition of xylitol are shown. Figure 2 It can be clearly observed that the symmetric cell assembled with only 2M ZnSO4 electrolyte exhibits a hydrogen evolution potential of -0.077V. However, after adding 0.1mol / L xylitol, the Zn||Zn symmetric cell exhibits a hydrogen evolution potential of -0.558V. This indicates that the addition of xylitol helps to increase the HER overpotential and prevents the decomposition of water molecules at the zinc anode interface.
[0071] Figure 3 SEM images of each zinc anode after 100 cycles of a Zn‖Zn symmetric cell are shown. In the images, a is a 10-cycle image of the electrolyte prepared in Example 1, b is a 100-cycle image of the electrolyte prepared in Example 1, c is a 10-cycle image of the electrolyte prepared in Comparative Example 1, and d is a 100-cycle image of the electrolyte prepared in Comparative Example 1. Figure 3 As can be observed in ab, the addition of xylitol makes the zinc deposition layer smoother; from Figure 3 The results show that when only pure zinc sulfate is used as the electrolyte, severe dendrite growth occurs on the surface of the Zn negative electrode, while the addition of 0.1 mol / L xylitol can significantly reduce dendrite growth.
[0072] Figure 4 The NMR spectra of the electrolyte before and after the addition of xylitol are shown, where the x-axis represents the chemical shift and the y-axis represents the relative diffraction intensity. Figure 4It can be observed that the addition of zinc sulfate shifts the peak value to a lower field, while the addition of xylitol shifts the peak value to a higher field, indicating that xylitol can combine with water molecules to form hydrogen bonds, thereby inhibiting the activity of free water.
[0073] Figure 5 SO42-containing xylitol solutions of different concentrations were added to a 2M ZnSO4 solution. 2– Raman spectra, where the x-axis represents chemical shift and the y-axis represents relative diffraction intensity. Figure 5 It can be seen that as the xylitol content increases, the content of solvent-separated ion pairs continuously increases, indicating that xylitol helps to weaken the electrostatic interaction between cations and anions and increase the zinc ion transfer number.
[0074] Figure 6 These are in-situ digital photographs of Zn||Zn symmetric cells. Specifically, a is an in-situ digital photograph of a Zn||Zn symmetric cell assembled using the electrolyte prepared in Comparative Example 1, and b is an in-situ digital photograph of a Zn||Zn symmetric cell assembled using the electrolyte prepared in Example 1. Figure 6 It can be seen that with the increase of charging and discharging time, especially at 40-60 min, severe dendrite growth will occur on the surface of the Zn negative electrode of the battery using only pure zinc sulfate electrolyte, while the addition of 0.1 mol / L xylitol can significantly reduce dendrite growth.
[0075] Figure 7 A Zn‖Zn symmetric cell at a current density of 1 mA / cm² 2 With an areal capacity density of 1 mAh / cm³ 2 The following is a graph showing the cycle performance. From... Figure 7 It can be clearly observed that the symmetric cell assembled with only 2M ZnSO4 electrolyte experienced a short circuit after 200 hours of cycling. However, after adding 0.1 mol / L xylitol, the Zn||Zn symmetric cell could operate stably for over 1100 hours. This clearly demonstrates that xylitol promotes uniform zinc ion deposition, thereby extending the cycle life.
[0076] Figure 11 The diagram shows the zinc ion transfer numbers of the Zn||Zn symmetric battery in Example 1 to verify the effect. In the diagram, a represents the zinc ion transfer number of the Zn||Zn symmetric battery assembled with the electrolyte prepared in Example 1; b represents the zinc ion transfer number of the Zn||Zn symmetric battery assembled with the electrolyte prepared in Comparative Example 4; and c represents the zinc ion transfer number of the Zn||Zn symmetric battery assembled with the electrolyte prepared in Comparative Example 1. Figure 11It can be seen that the addition of xylitol molecules can increase the zinc ion transfer number from 0.30 in pure ZnSO4 solution to 0.63; while replacing xylitol with an equal proportion of glucose, the zinc ion transfer number in the electrolyte drops to 0.35. Therefore, in this scheme, glucose, compared to xylitol, is more likely to delay zinc ion transfer.
[0077] Figure 12 The cycling performance diagrams for the Zn||Zn symmetric cells in Example 1 are shown to verify the effectiveness. In the diagram, a represents the cycling performance of the Zn||Zn symmetric cell assembled using the electrolyte prepared in Comparative Example 2, and b represents the cycling performance of the Zn||Zn symmetric cell assembled using the electrolyte prepared in Comparative Example 3. Figure 12 It can be seen that when the ZnSO4 concentration is 1M and 3M, the stable operating time of the Zn‖Zn symmetric cell is 453h and 412h, respectively. Furthermore, comparing these two results with the cycle performance graph of Example 1, it can be found that the electrolyte with a ZnSO4 concentration of 2M exhibits better cycle stability, indicating that the electrolyte ratio in Example 1 can more effectively stabilize the electrochemical reaction at the zinc anode.
[0078] (2) Using the electrolytes prepared in each embodiment, a Zn||Cu asymmetric cell consisting of a zinc foil electrode, a copper foil electrode, a glass fiber paper separator, and an electrolyte was prepared, and the Zn||Cu asymmetric cell was tested at a current density of 1 mA / cm². 2 With an areal capacity density of 1 mAh / cm³ 2 Coulomb efficiency under [the specified conditions].
[0079] Figure 8 The obtained Zn‖Cu asymmetric cell was tested at a current density of 1 mA / cm². 2 With an areal capacity density of 1 mAh / cm³ 2 Lower Coulomb efficiency diagram. From Figure 8 It can be clearly observed that the coulombic efficiency of the asymmetric battery assembled with 2M ZnSO4 electrolyte significantly decreased after 69 cycles. However, after adding 0.1 mol / L xylitol, the asymmetric battery could stably cycle for more than 100 cycles with a coulombic efficiency of 99.53%. This shows that xylitol can stably and uniformly deposit zinc ions on the copper foil substrate, effectively avoiding dendrite growth and HER.
[0080] (3) Using the electrolytes prepared in each embodiment, a Zn‖NaVO3 full cell consisting of a zinc foil electrode, a NaVO3 active electrode, a glass fiber paper separator, and an electrolyte was prepared, and the specific capacity and long-cycle qualitative properties of the Zn‖NaVO3 full cell at a current density of 0.5 A / g were tested.
[0081] Figure 9The long-cycle graph shows the charge-discharge performance of the obtained Zn‖NaVO3 full cell at a current density of 0.5 A / g. From... Figure 9 It can be clearly observed that the full battery containing xylitol has a higher specific capacity and no significant capacity decay after 200 cycles. Therefore, the full battery containing xylitol has a significantly better specific capacity and longer cycle stability than the battery without xylitol.
[0082] Figure 10 To verify the effectiveness, the rate performance diagram of the Zn‖NaV3O8 full cell assembled with the electrolytes prepared in Example 1 and Comparative Example 1 is shown. Figure 10 It can be seen that when the current density is increased by 10 times, the addition of xylitol can make the full battery retain 72.9% of its capacity, which is significantly better than the electrolyte without xylitol (45.8%), indicating that xylitol can effectively improve the rate performance of zinc-ion batteries.
[0083] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims
1. Use of an electrolyte containing xylitol in a zinc-ion battery, characterized in that, The components of the electrolyte containing xylitol include zinc sulfate, xylitol and water.
2. Use according to claim 1, characterized in that, The concentration of xylitol in the electrolyte containing xylitol is 0.01-1 mol / L, and the concentration of zinc sulfate is 1-3 mol / L.
3. Use according to claim 1, characterized in that, The preparation method of the electrolyte containing xylitol includes the following steps: Mixing zinc sulfate, xylitol and water to obtain the electrolyte containing xylitol.
4. Use according to claim 1, characterized in that, The electrolyte containing xylitol is used as the electrolyte of a symmetric zinc battery, an asymmetric copper-zinc battery or a zinc ion full battery.
5. Use according to claim 4, characterized in that, The symmetric zinc battery includes two parallel zinc foils, a glass fiber paper separator and the electrolyte containing xylitol of claim 1. The asymmetric copper-zinc battery includes a zinc foil, a copper foil, a glass fiber paper separator and the electrolyte containing xylitol of claim 1. The zinc ion full battery includes NaV3O8, a zinc foil, a glass fiber paper separator and the electrolyte containing xylitol of claim 1.
6. A symmetric zinc battery, characterized in that, The electrolyte containing xylitol of claim 1 is used in the application including two parallel zinc foils, a glass fiber paper separator.
7. An asymmetric copper-zinc battery, characterized by, The electrolyte containing xylitol of claim 1 is used in the application including a zinc foil, a copper foil and a glass fiber paper separator.
8. A zinc-ion all-solid battery, characterized by, The electrolyte containing xylitol of claim 1 is used in the application including NaV3O8, a zinc foil and a glass fiber paper separator.