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Porous iron selenide carbon-coated composite material and application thereof in potassium ion battery

A composite material, iron selenide technology, applied in porous iron selenide carbon-coated composite materials and its application in potassium ion batteries, can solve the problems of lithium resource consumption, lithium battery energy density can not be satisfied, etc., to achieve improvement Cycling performance, excellent cycle stability, effect of shortening the transfer path

Active Publication Date: 2021-10-19
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium metal is a scarce metal. With the massive increase in demand for lithium batteries, lithium resources are being consumed rapidly.
Moreover, the energy density of lithium batteries is gradually unable to meet the requirements of electric vehicles and large-scale energy storage grids

Method used

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  • Porous iron selenide carbon-coated composite material and application thereof in potassium ion battery
  • Porous iron selenide carbon-coated composite material and application thereof in potassium ion battery
  • Porous iron selenide carbon-coated composite material and application thereof in potassium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve 2g of ferric nitrate nonahydrate and 1.2g of benzenetricarboxylic acid in 25mL of deionized water respectively, after mixing, add 1mL of hydrofluoric acid, and stir for 30min. Transfer to a reaction kettle and keep at 150°C for 12h with a heating rate of 2°C / min. After cooling, wash and centrifuge. The sample was placed in a vacuum oven at 80°C for 12 hours, and after drying, the MIL-100(Fe) precursor was obtained.

[0027] Take 200 mg of MIL-100 (Fe) precursor and 300 mg of selenium powder, and use a ball mill at a speed of 200 r / min for 2 h for mixing. The mixture was placed in a tube furnace, and under the protection of an argon atmosphere, the temperature was raised at a rate of 5 °C / min, first kept at 260 °C for 5 h, and then kept at 720 °C for 4 h. After the reaction is finished, the black solid after the reaction is taken out to obtain a porous iron selenide carbon-coated composite material.

Embodiment 2

[0029] Dissolve 2g of ferric nitrate nonahydrate and 1.5g of benzenetricarboxylic acid in 25mL of deionized water respectively, after mixing, add 2mL of hydrofluoric acid, and stir for 30min. Transfer to a reaction kettle and keep at 160°C for 12h with a heating rate of 2°C / min. After cooling, wash and centrifuge. The sample was placed in a vacuum oven at 80°C for 12 hours, and after drying, the MIL-100(Fe) precursor was obtained.

[0030] Take 300 mg of MIL-100 (Fe) precursor and 300 mg of selenium powder, and use a ball mill at a speed of 400 r / min for 2 h for mixing. The mixture was placed in a tube furnace, and under the protection of an argon atmosphere, the temperature was raised at a rate of 5 °C / min, first kept at 280 °C for 3 h, and then kept at 720 °C for 4 h. After the reaction is finished, the black solid after the reaction is taken out to obtain a porous iron selenide carbon-coated composite material.

Embodiment 3

[0032] Dissolve 2g of ferric nitrate nonahydrate and 1.6g of benzenetricarboxylic acid in 25mL of deionized water respectively, after mixing, add 1mL of hydrofluoric acid, and stir for 30min. Transfer to a reaction kettle and keep at 170°C for 12h with a heating rate of 2°C / min. After cooling, wash and centrifuge. The sample was placed in a vacuum oven at 80°C for 12 hours, and after drying, the MIL-100(Fe) precursor was obtained.

[0033] Take 120 mg of MIL-100 (Fe) precursor and 200 mg of selenium powder, and use a ball mill at a speed of 200 r / min for 2 h for mixing. The mixture was placed in a tube furnace, and under the protection of an argon atmosphere, the temperature was raised at a rate of 5 °C / min, first kept at 260 °C for 2 h, and then kept at 720 °C for 4 h. After the reaction is finished, the black solid after the reaction is taken out to obtain a porous iron selenide carbon-coated composite material.

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Abstract

The invention discloses a porous iron selenide carbon-coated composite material and application thereof in a potassium ion battery, and relates to the technical field of battery electrode materials. The porous iron selenide carbon-coated composite material is formed by a high-temperature reaction of an MIL-100 (Fe) precursor and selenium powder. The composite material is applied as an electrode material of a potassium ion battery, and the unique carbon-coated structure and mesoporous channels of the composite material are beneficial to improving the cycle performance and rate capability of the potassium ion battery. By using the potassium ion battery prepared from the composite material, the problems of slow potassium ion reaction kinetics and volume expansion of an electrode material can be solved.

Description

Technical field: [0001] The invention relates to the technical field of battery electrode materials, in particular to a porous iron selenide carbon-coated composite material and its application in potassium ion batteries. Background technique: [0002] In the past two decades, lithium batteries have been widely used in people's daily life due to their high energy density, good cycle performance, green and non-polluting advantages: mobile phones, computers, electric vehicles, etc. However, as lithium metal is a scarce metal, lithium resources are rapidly consumed with the massive increase in demand for lithium batteries. Moreover, the energy density of lithium batteries is gradually unable to meet the requirements of electric vehicles and large-scale energy storage grids. Therefore, under the current situation, because potassium metal is more abundant and low-cost than lithium, potassium-ion batteries have emerged as the next energy storage battery that has the opportunity t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00C01B32/05H01M4/58H01M4/62H01M10/054
CPCC01B19/007C01B32/05H01M4/581H01M4/625H01M10/054C01P2002/72C01P2004/04C01P2006/40Y02E60/10
Inventor 刘伶俐孟祥贺胡磊余磊
Owner HEFEI UNIV
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