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A kind of negative electrode material for potassium ion battery and its preparation method and electrolyte

A negative electrode material, potassium ion technology, applied in the field of electrochemistry, can solve problems such as specific capacity to be improved, poor cycle performance, large volume expansion, etc., to achieve the effect of improving electrochemical performance, excellent rate performance, and low viscosity

Active Publication Date: 2021-03-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, reports on anode materials for potassium-ion batteries mostly focus on traditional carbon-based materials. However, due to the K + larger size It will cause a large volume expansion during the deintercalation process, resulting in poor cycle performance; in addition, its specific capacity needs to be improved

Method used

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  • A kind of negative electrode material for potassium ion battery and its preparation method and electrolyte
  • A kind of negative electrode material for potassium ion battery and its preparation method and electrolyte
  • A kind of negative electrode material for potassium ion battery and its preparation method and electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh polyvinylpyrrolidone powder and ferric nitrate nonahydrate according to the mass ratio of 1:1.5, dissolve ferric nitrate nonahydrate and polyvinylpyrrolidone nonahydrate respectively in deionized water to make a mixed solution and stir it ultrasonically for 10 minutes, then place the mixed solution in air-dried Keep warm at 80°C in the box until it is completely dry, then grind the dried product into powder and transfer the powder to a crucible, which is placed in a tube furnace under N 2 Heated to 700°C at a heating rate of 5°C / min in the atmosphere, and held for 1 hour. After the tube furnace cooled, the black foamy product was collected to obtain a three-dimensional porous nitrogen-doped graphene composite material decorated with iron carbide nanoparticles. Take an appropriate amount of three-dimensional porous nitrogen-doped graphene composite powder modified by iron carbide nanoparticles in a crucible, and then place the crucible at the downstream position of ...

Embodiment 2

[0031] Mix the three-dimensional porous nitrogen-doped graphene composite material modified with iron carbide nanoparticles, the conductive agent Ketjen black and the binder polyvinylidene fluoride (PVDF) at a mass ratio of 7:2:1, grind evenly and add an appropriate amount of N- Methylpyrrolidone (NMP) is made into a slurry, which is uniformly coated on the copper foil. After vacuum drying at 100°C for 10 h, it was cut into electrode sheets with a diameter of 10 mm by a microtome for use. With metal potassium sheet as counter electrode, glass fiber as diaphragm, 1mol / L KPF 6 / EC / DEC is the electrolyte, and it is assembled into a CR2032 button cell in an argon-protected glove box. After the battery is assembled, let it stand for 12 hours, and use the LAND CT2001A battery test system to conduct a constant current charge and discharge test with a test voltage of 0.01-2.5V.

[0032] Figure 5 It is the charge-discharge curve of the prepared three-dimensional porous nitrogen-dop...

Embodiment 3

[0034] Mix the three-dimensional porous nitrogen-doped graphene composite material modified with iron carbide nanoparticles, the conductive agent Ketjen black and the binder polyvinylidene fluoride (PVDF) at a mass ratio of 6:3:1, grind evenly and add an appropriate amount of N- Methylpyrrolidone (NMP) is made into a slurry, which is uniformly coated on the copper foil. After vacuum drying at 100°C for 10 h, it was cut into electrode sheets with a diameter of 10 mm by a microtome for use. With metal potassium sheet as counter electrode, glass fiber as diaphragm, 1mol / L KPF 6 / EC / DEC is the electrolyte, and it is assembled into a CR2032 button cell in an argon-protected glove box. After the battery is assembled, let it stand for 12 hours, and use the LAND CT2001A battery test system to conduct a constant current charge and discharge test with a test voltage of 0.01-2.5V.

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Abstract

The invention discloses a negative electrode material for a potassium ion battery, a preparation method and an electrolytic solution, and belongs to the field of chemical power sources. The material composition of the negative electrode material is: 60%-95% iron-based compound modified three-dimensional porous nitrogen-doped graphene composite material, 2%-30% conductive agent, 3%-10% polyvinylidene fluoride (PVDF) adhesive A binder; the iron-based compound modified three-dimensional porous nitrogen-doped graphene composite material is a three-dimensional porous nitrogen-doped graphene composite material modified by iron carbide nanoparticles, a three-dimensional porous nitrogen-doped graphene modified by ferric oxide nanoparticles Any one of composite materials and three-dimensional porous nitrogen-doped graphene composite materials modified by iron disulfide nanoparticles. The anode material of the potassium ion battery prepared by the present invention has a stable framework structure, a large specific surface area, and nano-particle modification, and has excellent electrochemical performance; moreover, the raw material is abundant, the preparation cost is low, and it is easy for large-scale production, and has a very important industrial application prospect .

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a three-dimensional porous nitrogen-doped graphene negative electrode material modified with an iron-based compound for a potassium ion battery, a preparation method and an electrolyte, especially improving the electrochemical performance of the electrode material by optimizing the electrolyte . Background technique [0002] With the increasingly prominent energy and environmental issues and the rising cost of lithium-ion batteries, it is urgent to develop new energy storage technologies. Potassium-ion batteries hold great promise due to their many advantages. First, potassium resources are abundant and low cost; second, compared with other alkali metal ions, the weaker Lewis acidity makes K + It has a large transfer number and mobility in the electrolyte and the interface between the electrolyte and the electrode; finally, K + / K standard electrode potential ratio ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/58H01M4/587H01M4/62H01M10/054H01M10/0568H01M10/0569B82Y30/00
CPCB82Y30/00H01M4/364H01M4/523H01M4/58H01M4/5815H01M4/587H01M4/625H01M4/628H01M10/054H01M10/0568H01M10/0569H01M2300/0037Y02E60/10
Inventor 李平韩坤王伟刘志伟刘颖赵汪安富强曲选辉
Owner UNIV OF SCI & TECH BEIJING
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