A kind of novel negative electrode material of potassium ion battery and preparation method thereof

Abstract

The invention belongs to the technical field of potassium ion batteries, and in particular relates to a novel negative electrode material for potassium ion batteries and a preparation method thereof. The novel negative electrode material of the potassium ion battery is NiFeS compound. First, Fe-MIL88A nanorods were synthesized as a precursor; then a layer of nickel nanosheets was grown on the surface of the precursor Fe-MIL88A nanorods by hydrothermal method; finally, NiFeS compounds were obtained through high-temperature sulfidation. The new negative electrode material overcomes the volume expansion defect of the existing potassium ion battery negative electrode material during charging and discharging, and effectively improves the cycle performance of the battery. capacity and stability.

Description

technical field

[0001] The invention belongs to the technical field of potassium ion batteries, and in particular relates to a novel negative electrode material for potassium ion batteries and a preparation method thereof. Background technique

[0002] In recent years, lithium-ion batteries have been widely used in portable energy storage devices, electric vehicles and power grids. However, the high price of lithium sources limits the further development of lithium-ion batteries. Therefore, researchers have begun to study and explore alternative lithium-ion battery storage In these energy storage systems, potassium ions have the same electrochemical working principle as lithium-ion batteries, and are inexpensive and environmentally friendly, which has attracted attention; in addition, potassium has a standard hydrogen potential (- 2.93V), which means that potassium has a high operating voltage and high energy density. However, due to the severe volume expansion during the c...

Examples

Embodiment 1

[0025] The novel negative electrode material of the potassium ion battery is a NiFeS compound. The NiFeS compound has a hollow nanorod structure, and a sheet structure is formed on the surface of the nanorod.

[0026] The preparation method of the novel negative electrode material of the potassium ion battery comprises the following steps:

[0027] (1) Preparation of iron-based metal framework precursor Fe-MIL-88A: first measure 8mL DMF and place it in a round bottom flask, then add 0.16g Fe(NO 3 ) 3 ﹒ 9H 2 O and 0.042g fumaric acid were stirred for 30min, and then transferred to an oil bath at 110°C for reaction for 1h after stirring evenly; after the reaction was completed, DMF and methanol were used to wash 3 times, dried in an oven at 70°C, and set aside;

[0028] (2) Preparation of FeNi@LDH compound: Firstly, the precursor Fe-MIL-88A prepared in step (1) and 0.1g nickel nitrate were dispersed in 100mL water by ultrasonic dispersion; then 0.3g urea and 0.05g ammonium f...

Embodiment 2

[0033] The preparation method of the novel negative electrode material of the potassium ion battery comprises the following steps:

[0034] (1) Preparation of iron-based metal framework precursor Fe-MIL-88A: first measure 8mL DMF and place it in a round bottom flask, then add 0.16g Fe(NO 3 ) 3 ﹒ 9H 2 O and 0.042g fumaric acid were stirred for 30min, and then transferred to an oil bath at 110°C for reaction for 1h after stirring evenly; after the reaction was completed, DMF and methanol were used to wash 3 times, dried in an oven at 70°C, and set aside;

[0035] (2) Preparation of FeNi@LDH compound: Firstly, the precursor Fe-MIL-88A prepared in step (1) and 0.1g nickel nitrate were dispersed in 100mL water by ultrasonic dispersion; then 0.3g urea and 0.05g ammonium fluoride were added Stir until completely dissolved, stir evenly, transfer to an oven at 110°C for 10 hours of reaction; after the reaction, wash with water and ethanol three times, and dry in an oven at 70°C to o...

Embodiment 3

[0039] The preparation method of the novel negative electrode material of the potassium ion battery comprises the following steps:

[0040](1) Preparation of iron-based metal framework precursor Fe-MIL-88A: first measure 8mL DMF and place it in a round bottom flask, then add 0.16g Fe(NO 3 ) 3 ﹒ 9H 2 O and 0.042g fumaric acid were stirred for 30min, and then transferred to an oil bath at 110°C for reaction for 1h after stirring evenly; after the reaction was completed, DMF and methanol were used to wash 3 times, dried in an oven at 70°C, and set aside;

[0041] (2) Preparation of FeNi@LDH compound: Firstly, the precursor Fe-MIL-88A prepared in step (1) and 0.2g nickel nitrate were dispersed in 100mL water by ultrasonic dispersion; then 0.3g urea and 0.1g ammonium fluoride were added Stir until completely dissolved, stir evenly, transfer to an oven at 110°C for 5 hours of reaction; after the reaction, wash with water and ethanol three times, and dry in an oven at 70°C to obta...

technical field

[0001] The invention belongs to the technical field of potassium ion batteries, and in particular relates to a novel negative electrode material for potassium ion batteries and a preparation method thereof. Background technique

[0002] In recent years, lithium-ion batteries have been widely used in portable energy storage devices, electric vehicles and power grids. However, the high price of lithium sources limits the further development of lithium-ion batteries. Therefore, researchers have begun to study and explore alternative lithium-ion battery storage In these energy storage systems, potassium ions have the same electrochemical working principle as lithium-ion batteries, and are inexpensive and environmentally friendly, which has attracted attention; in addition, potassium has a standard hydrogen potential (- 2.93V), which means that potassium has a high operating voltage and high energy density. However, due to the severe volume expansion during the c...

Examples

Embodiment 1

[0025] The novel negative electrode material of the potassium ion battery is a NiFeS compound. The NiFeS compound has a hollow nanorod structure, and a sheet structure is formed on the surface of the nanorod.

[0026] The preparation method of the novel negative electrode material of the potassium ion battery comprises the following steps:

[0027] (1) Preparation of iron-based metal framework precursor Fe-MIL-88A: first measure 8mL DMF and place it in a round bottom flask, then add 0.16g Fe(NO 3 ) 3 ﹒ 9H 2 O and 0.042g fumaric acid were stirred for 30min, and then transferred to an oil bath at 110°C for reaction for 1h after stirring evenly; after the reaction was completed, DMF and methanol were used to wash 3 times, dried in an oven at 70°C, and set aside;

[0028] (2) Preparation of FeNi@LDH compound: Firstly, the precursor Fe-MIL-88A prepared in step (1) and 0.1g nickel nitrate were dispersed in 100mL water by ultrasonic dispersion; then 0.3g urea and 0.05g ammonium f...

Embodiment 2

[0033] The preparation method of the novel negative electrode material of the potassium ion battery comprises the following steps:

[0034] (1) Preparation of iron-based metal framework precursor Fe-MIL-88A: first measure 8mL DMF and place it in a round bottom flask, then add 0.16g Fe(NO 3 ) 3 ﹒ 9H 2 O and 0.042g fumaric acid were stirred for 30min, and then transferred to an oil bath at 110°C for reaction for 1h after stirring evenly; after the reaction was completed, DMF and methanol were used to wash 3 times, dried in an oven at 70°C, and set aside;

[0035] (2) Preparation of FeNi@LDH compound: Firstly, the precursor Fe-MIL-88A prepared in step (1) and 0.1g nickel nitrate were dispersed in 100mL water by ultrasonic dispersion; then 0.3g urea and 0.05g ammonium fluoride were added Stir until completely dissolved, stir evenly, transfer to an oven at 110°C for 10 hours of reaction; after the reaction, wash with water and ethanol three times, and dry in an oven at 70°C to o...

Embodiment 3

[0039] The preparation method of the novel negative electrode material of the potassium ion battery comprises the following steps:

[0040](1) Preparation of iron-based metal framework precursor Fe-MIL-88A: first measure 8mL DMF and place it in a round bottom flask, then add 0.16g Fe(NO 3 ) 3 ﹒ 9H 2 O and 0.042g fumaric acid were stirred for 30min, and then transferred to an oil bath at 110°C for reaction for 1h after stirring evenly; after the reaction was completed, DMF and methanol were used to wash 3 times, dried in an oven at 70°C, and set aside;

[0041] (2) Preparation of FeNi@LDH compound: Firstly, the precursor Fe-MIL-88A prepared in step (1) and 0.2g nickel nitrate were dispersed in 100mL water by ultrasonic dispersion; then 0.3g urea and 0.1g ammonium fluoride were added Stir until completely dissolved, stir evenly, transfer to an oven at 110°C for 5 hours of reaction; after the reaction, wash with water and ethanol three times, and dry in an oven at 70°C to obta...

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