Barium-based double-ion battery and preparation method thereof

Abstract

The invention discloses a barium-based double-ion battery and a preparation method thereof, and relates to the field of electrochemical energy storage devices. The barium-based double-ion battery includes a negative electrode, a positive electrode, a diaphragm between the positive and negative electrodes, and an electrolyte; the active material of the negative electrode is a layered material that can reversibly intercalate and release barium ions; the active material of the positive electrode is a layer that can reversibly intercalate A layered material that intercalates and deintercalates anions in the electrolyte; the electrolyte includes barium salts and non-aqueous solvents. The invention alleviates the disadvantages of limited lithium resource reserves and high cost of the existing lithium ion battery, and the problems of limited electrode materials and unsatisfactory electrochemical performance of the existing lithium ion battery. The invention is a new battery system. The storage and release of charges in the system are realized through the migration of barium cations and corresponding anions. The positive and negative electrode materials are simple, easy to obtain, environmentally friendly and safe, so that the production process of the battery is simple and the cost is low. Low, the electrochemical performance of the barium-based dual-ion system battery is relatively excellent.

Description

technical field

[0001] The invention relates to the technical field of electrochemical energy storage devices, in particular to a barium-based double-ion battery and a preparation method thereof. Background technique

[0002] Lithium-ion battery is currently a high-efficiency, rechargeable and rechargeable secondary battery that can be used multiple times. It is widely used in every industry. At the same time, lithium-ion batteries also face the disadvantages of reduced lithium content due to the use of lithium resources, limited reserves, and high costs, resulting in rising costs during use.

[0003] In order to solve this problem, other ion batteries are increasingly being studied as energy storage technologies to potentially replace lithium-ion batteries, such as sodium-ion batteries, potassium-ion batteries, etc. The research on these ions has just started, and the capacity and cycle performance of batteries have not yet Reached a better level, and the preparation proc...

Examples

Embodiment approach

[0143] As a preferred embodiment, the preparation method of barium-based double ion battery comprises the following steps:

[0144] a) Prepare the negative electrode: mix the active material of the negative electrode material, the conductive agent, the binder and the solvent to make a slurry; then evenly coat the negative electrode material slurry on the surface of the negative electrode current collector, and cut it into pieces after drying to obtain the required size. negative electrode;

[0145] b) Preparation of electrolyte solution: dissolving the barium salt electrolyte in the corresponding non-aqueous solvent, and fully mixing to obtain the electrolyte solution;

[0146] c) Prepare the diaphragm: cut the diaphragm into the required size and dry it;

[0147] d) Prepare the positive electrode: mix the active material of the positive electrode material, the conductive agent, the binder, and the solvent to form a slurry; then evenly coat the positive electrode material slu...

Embodiment 1

[0155] A barium-based double-ion battery includes a negative electrode, a diaphragm, an electrolyte and a positive electrode.

[0156] Preparation of negative electrode: Add 0.8g of expanded graphite, 0.1g of carbon black, and 0.1g of polyvinylidene fluoride into 2mL of nitrogen-methylpyrrolidone solution, grind thoroughly to obtain a uniform slurry; then evenly coat the slurry on the surface of aluminum foil (negative electrode assembly fluid) and vacuum dried. The electrode sheets obtained by drying were cut into discs with a diameter of 12 mm, which were compacted and used as battery negative electrodes for future use.

[0157] Preparation of the separator: the glass fiber film was cut into discs with a diameter of 16 mm and used as a separator for later use.

[0158] Preparation of electrolyte solution: Weigh 3g of barium trifluoromethanesulfonate and add it to 5mL of a mixed solvent of ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate (v:v:v=4:3:2), stir ...

Embodiment 2-10

[0162] The preparation process of the barium-based double-ion battery of Example 2-10 is different from that of Example 1 except that the active material used in the preparation of the positive electrode is different, and all other steps and materials used are the same, while the barium-ion battery of Example 2-10 The energy storage performance was tested and compared with the performance of Example 1. Battery testing includes energy density and specific capacity, and the specific test methods are as follows:

[0163] Cycle charge and discharge: cycle charge and discharge are carried out on CT2001C-001 blue electric battery cycle test system, and the standard capacity of the electrode is tested by charging and discharging at a rate of 100mA / g, the specific capacity of the material = current * time / sample mass, the energy density of the material =specific capacity of the material*plateau voltage of the battery, the charging and discharging conditions depend on the needs of th...

technical field

[0001] The invention relates to the technical field of electrochemical energy storage devices, in particular to a barium-based double-ion battery and a preparation method thereof. Background technique

[0002] Lithium-ion battery is currently a high-efficiency, rechargeable and rechargeable secondary battery that can be used multiple times. It is widely used in every industry. At the same time, lithium-ion batteries also face the disadvantages of reduced lithium content due to the use of lithium resources, limited reserves, and high costs, resulting in rising costs during use.

[0003] In order to solve this problem, other ion batteries are increasingly being studied as energy storage technologies to potentially replace lithium-ion batteries, such as sodium-ion batteries, potassium-ion batteries, etc. The research on these ions has just started, and the capacity and cycle performance of batteries have not yet Reached a better level, and the preparation proc...

Examples

Embodiment approach

[0143] As a preferred embodiment, the preparation method of barium-based double ion battery comprises the following steps:

[0144] a) Prepare the negative electrode: mix the active material of the negative electrode material, the conductive agent, the binder and the solvent to make a slurry; then evenly coat the negative electrode material slurry on the surface of the negative electrode current collector, and cut it into pieces after drying to obtain the required size. negative electrode;

[0145] b) Preparation of electrolyte solution: dissolving the barium salt electrolyte in the corresponding non-aqueous solvent, and fully mixing to obtain the electrolyte solution;

[0146] c) Prepare the diaphragm: cut the diaphragm into the required size and dry it;

[0147] d) Prepare the positive electrode: mix the active material of the positive electrode material, the conductive agent, the binder, and the solvent to form a slurry; then evenly coat the positive electrode material slu...

Embodiment 1

[0155] A barium-based double-ion battery includes a negative electrode, a diaphragm, an electrolyte and a positive electrode.

[0156] Preparation of negative electrode: Add 0.8g of expanded graphite, 0.1g of carbon black, and 0.1g of polyvinylidene fluoride into 2mL of nitrogen-methylpyrrolidone solution, grind thoroughly to obtain a uniform slurry; then evenly coat the slurry on the surface of aluminum foil (negative electrode assembly fluid) and vacuum dried. The electrode sheets obtained by drying were cut into discs with a diameter of 12 mm, which were compacted and used as battery negative electrodes for future use.

[0157] Preparation of the separator: the glass fiber film was cut into discs with a diameter of 16 mm and used as a separator for later use.

[0158] Preparation of electrolyte solution: Weigh 3g of barium trifluoromethanesulfonate and add it to 5mL of a mixed solvent of ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate (v:v:v=4:3:2), stir ...

Embodiment 2-10

[0162] The preparation process of the barium-based double-ion battery of Example 2-10 is different from that of Example 1 except that the active material used in the preparation of the positive electrode is different, and all other steps and materials used are the same, while the barium-ion battery of Example 2-10 The energy storage performance was tested and compared with the performance of Example 1. Battery testing includes energy density and specific capacity, and the specific test methods are as follows:

[0163] Cycle charge and discharge: cycle charge and discharge are carried out on CT2001C-001 blue electric battery cycle test system, and the standard capacity of the electrode is tested by charging and discharging at a rate of 100mA / g, the specific capacity of the material = current * time / sample mass, the energy density of the material =specific capacity of the material*plateau voltage of the battery, the charging and discharging conditions depend on the needs of th...

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