A kind of electrolyte and its application in electrochemical energy storage device

Abstract

The invention discloses an electrolytic solution, which comprises a solvent and an electrolyte; wherein, the solvent is a mixture of an organic solvent and water, wherein the mass ratio of the organic solvent to water is 1 / 10-1 / 1; The electrolyte is a soluble salt of alkali metal and / or zinc. The electrolyte has good high-voltage and low-temperature resistance, has a high-voltage window and a wide operating temperature range, and can be preferably used in supercapacitors or hybrid capacitors. The invention also discloses the application of the electrolyte.

Description

technical field

[0001] The invention relates to the field of electrochemical energy storage. More specifically, it relates to an electrolyte and its application in electrochemical energy storage devices. Background technique

[0002] Supercapacitors play an indispensable role in the field of electrochemical energy storage due to their ultra-high power density and ultra-long life. However, supercapacitors also have the disadvantage of low energy density, so how to obtain supercapacitors with high energy storage density is also one of the main research contents of relevant researchers.

[0003] Improving the energy storage density of supercapacitors by increasing their working voltage is one of the existing research directions. The electrolyte used in existing supercapacitors is usually an aqueous electrolyte or an organic electrolyte. Although the water-based electrolyte is cheap, the traditional water-based electrolyte is limited by the low decomposition voltage of water ...

Examples

Embodiment 1

[0033] The specific composition of the mixed electrolyte of this example is solvent (water and acetonitrile), the functional solute of confined water molecules is sucrose, and the electrolyte is sodium nitrate. Put 1g of deionized water and 0.3g of acetonitrile in a glass sample bottle, seal it, put it in a blast drying oven at 90°C and heat it for 20 minutes until fully dissolved, and then obtain the mixed electrolyte of this example after cooling. Among them, the mass fraction of sucrose in the electrolyte is 51.7%. The electrochemical window test of the mixed electrolyte prepared in this example was carried out by linear voltammetry (saturated calomel electrode as reference electrode, platinum disk electrode as working electrode, and platinum sheet electrode as counter electrode). The results show that the electrochemical stability window of the mixed electrolyte is 2.5V.

[0034] The mixed electrolyte solution of this example is used in the assembly of aqueous sodium ion ...

Embodiment 2

[0036] The specific composition of the mixed electrolyte of this example is solvent (water and acetonitrile), the functional solute of confined water molecules is maltose, and the electrolyte is sodium nitrate. The preparation method is as follows: Weigh 1g of maltose and 0.1g of sodium nitrate into Put deionized water and 0.3g of acetonitrile in a glass sample bottle, seal it, put it in a blast drying oven at 90°C and heat it for 20 minutes until it is fully dissolved. After cooling, the mixed electrolyte of this example is obtained. Among them, the mass fraction of maltose in the electrolyte is 41.7%. The electrochemical window test of the mixed electrolyte prepared in this example was carried out by linear voltammetry (saturated calomel electrode as reference electrode, platinum disk electrode as working electrode, and platinum sheet electrode as counter electrode). The results show that the electrochemical stability window of the mixed electrolyte is 2.4V.

[0037] The mi...

Embodiment 3

[0039] The specific composition of the mixed electrolyte of this example is a solvent (water and acetonitrile), the functional solute of confined water molecules is fructose, and the electrolyte is sodium nitrate. Put 1g of deionized water and 0.3g of acetonitrile in a glass sample bottle, seal it, put it in a blast drying oven at 90°C and heat it for 20 minutes until fully dissolved, and then obtain the mixed electrolyte of this example after cooling. Among them, the mass fraction of fructose in the electrolyte is 51.7%. The electrochemical window test of the mixed electrolyte prepared in this example was carried out by linear voltammetry (saturated calomel electrode as reference electrode, platinum disk electrode as working electrode, and platinum sheet electrode as counter electrode). The results show that the electrochemical stability window of the mixed electrolyte is 2.3V.

[0040] The mixed electrolyte solution of this example is used in the assembly of aqueous sodium ...

technical field

[0001] The invention relates to the field of electrochemical energy storage. More specifically, it relates to an electrolyte and its application in electrochemical energy storage devices. Background technique

[0002] Supercapacitors play an indispensable role in the field of electrochemical energy storage due to their ultra-high power density and ultra-long life. However, supercapacitors also have the disadvantage of low energy density, so how to obtain supercapacitors with high energy storage density is also one of the main research contents of relevant researchers.

[0003] Improving the energy storage density of supercapacitors by increasing their working voltage is one of the existing research directions. The electrolyte used in existing supercapacitors is usually an aqueous electrolyte or an organic electrolyte. Although the water-based electrolyte is cheap, the traditional water-based electrolyte is limited by the low decomposition voltage of water ...

Examples

Embodiment 1

[0033] The specific composition of the mixed electrolyte of this example is solvent (water and acetonitrile), the functional solute of confined water molecules is sucrose, and the electrolyte is sodium nitrate. Put 1g of deionized water and 0.3g of acetonitrile in a glass sample bottle, seal it, put it in a blast drying oven at 90°C and heat it for 20 minutes until fully dissolved, and then obtain the mixed electrolyte of this example after cooling. Among them, the mass fraction of sucrose in the electrolyte is 51.7%. The electrochemical window test of the mixed electrolyte prepared in this example was carried out by linear voltammetry (saturated calomel electrode as reference electrode, platinum disk electrode as working electrode, and platinum sheet electrode as counter electrode). The results show that the electrochemical stability window of the mixed electrolyte is 2.5V.

[0034] The mixed electrolyte solution of this example is used in the assembly of aqueous sodium ion ...

Embodiment 2

[0036] The specific composition of the mixed electrolyte of this example is solvent (water and acetonitrile), the functional solute of confined water molecules is maltose, and the electrolyte is sodium nitrate. The preparation method is as follows: Weigh 1g of maltose and 0.1g of sodium nitrate into Put deionized water and 0.3g of acetonitrile in a glass sample bottle, seal it, put it in a blast drying oven at 90°C and heat it for 20 minutes until it is fully dissolved. After cooling, the mixed electrolyte of this example is obtained. Among them, the mass fraction of maltose in the electrolyte is 41.7%. The electrochemical window test of the mixed electrolyte prepared in this example was carried out by linear voltammetry (saturated calomel electrode as reference electrode, platinum disk electrode as working electrode, and platinum sheet electrode as counter electrode). The results show that the electrochemical stability window of the mixed electrolyte is 2.4V.

[0037] The mi...

Embodiment 3

[0039] The specific composition of the mixed electrolyte of this example is a solvent (water and acetonitrile), the functional solute of confined water molecules is fructose, and the electrolyte is sodium nitrate. Put 1g of deionized water and 0.3g of acetonitrile in a glass sample bottle, seal it, put it in a blast drying oven at 90°C and heat it for 20 minutes until fully dissolved, and then obtain the mixed electrolyte of this example after cooling. Among them, the mass fraction of fructose in the electrolyte is 51.7%. The electrochemical window test of the mixed electrolyte prepared in this example was carried out by linear voltammetry (saturated calomel electrode as reference electrode, platinum disk electrode as working electrode, and platinum sheet electrode as counter electrode). The results show that the electrochemical stability window of the mixed electrolyte is 2.3V.

[0040] The mixed electrolyte solution of this example is used in the assembly of aqueous sodium ...

Images