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Bismuth metal anode for sodium/potassium ion secondary battery and ether-based electrolyte

A secondary battery, potassium ion technology, applied in the field of electrochemistry, can solve the problems of inappropriate charging and discharging platform voltage, low Coulomb efficiency, fast decay, etc., to improve rate performance and cycle stability, improve ionic conductivity, and improve The effect of stability

Active Publication Date: 2017-02-22
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of small specific capacity, fast decay, inappropriate charging and discharging platform voltage, and low Coulombic efficiency of the existing negative electrode material bismuth, and to provide a bismuth negative electrode and ether electrolyte system for a sodium ion secondary battery. Capacity retention, coulombic efficiency and rate performance have all been effectively improved

Method used

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  • Bismuth metal anode for sodium/potassium ion secondary battery and ether-based electrolyte
  • Bismuth metal anode for sodium/potassium ion secondary battery and ether-based electrolyte
  • Bismuth metal anode for sodium/potassium ion secondary battery and ether-based electrolyte

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Embodiment 1

[0033] This embodiment provides a sodium-ion battery.

[0034] The composition of the negative electrode material of the sodium ion battery (based on the mass fraction of the negative electrode material as 100%): 80% of bismuth powder, 10% of conductive carbon black, and 10% of polyvinylidene fluoride.

[0035] The counter electrode of a sodium-ion battery is sodium metal.

[0036] The solvent of the electrolyte is: tetraethylene glycol dimethyl ether.

[0037] The electrolyte salt is: sodium trifluoromethanesulfonate, and the substance concentration in the electrolyte is 1 mol / L.

[0038] How to make the battery:

[0039] Negative electrode preparation: Weigh each raw material according to the above negative electrode formula, uniformly disperse it in N-methyl-2-pyrrolidone (NMP) solution, prepare a mixed slurry of negative electrode, and coat the slurry on the copper foil of the negative electrode current collector , dried in a vacuum drying oven at 110°C for 10 hours, an...

Embodiment 2

[0048] This embodiment provides a sodium-ion battery.

[0049] The composition of the negative electrode material of the sodium ion battery (based on the mass fraction of the negative electrode material as 100%): 80% of bismuth powder, 10% of conductive carbon black, and 10% of polyvinylidene fluoride.

[0050] The counter electrode of a sodium-ion battery is sodium metal.

[0051] The solvent of the electrolyte is: triethylene glycol dimethyl ether

[0052] The electrolyte salt is: sodium trifluoromethanesulfonate, and the substance concentration in the electrolyte is 1 mol / L.

[0053] How to make the battery:

[0054] Negative electrode preparation: Weigh each raw material according to the above negative electrode formula, uniformly disperse it in N-methyl-2-pyrrolidone (NMP) solution, prepare a negative electrode mixed slurry, and coat the slurry on the negative electrode current collector copper foil Then, it was dried in a vacuum drying oven at 110° C. for 10 hours, an...

Embodiment 3

[0061] This embodiment provides a sodium-ion battery.

[0062] The composition of the negative electrode material of the sodium ion battery (calculated based on the mass fraction of the negative electrode material as 100%): 80% of bismuth, 10% of conductive carbon black, and 10% of polyvinylidene fluoride.

[0063] The counter electrode of a sodium-ion battery is sodium metal.

[0064] The solvent of the electrolyte is: diethylene glycol dimethyl ether

[0065] The electrolyte salt is: sodium trifluoromethanesulfonate, and the substance concentration in the electrolyte is 1 mol / L.

[0066] How to make the battery:

[0067] Negative electrode preparation: Weigh each raw material according to the above negative electrode formula, uniformly disperse it in N-methyl-2-pyrrolidone (NMP) solution, prepare a negative electrode mixed slurry, and coat the slurry on the negative electrode current collector copper foil Then, it was dried in a vacuum drying oven at 110° C. for 10 hours,...

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Abstract

The invention discloses a bismuth metal anode for a sodium / potassium ion secondary battery and ether-based electrolyte. The problems of low capacity, low charge and discharge coulomb efficiency, poor cycling stability of bismuth metal in ester electrolyte and the like of a hard carbon anode of the conventional sodium / potassium ion battery are solved. The adopted ether-based electrolyte comprises an ether organic solvent and an electrolyte salt. With use of an anode material bismuth and ether electrolyte system, the coulomb efficiency and cycling stability of the bismuth metal anode of the sodium / potassium ion secondary battery can be greatly improved. In addition, in the system, the bismuth metal has high specific capacity (-385mAh / g) and high rate performance. Experimental results show that the capacity of a button battery assembled by the bismuth metal anode and ether electrolyte system is hardly attenuated and is still kept about 380mAh / g after 200 charge and discharge cycles under a current density of 400mA / g, and broad application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a bismuth negative electrode of a sodium / potassium ion secondary battery and an ether electrolyte system. Background technique [0002] Due to the abundant reserves of sodium in nature (the abundance of sodium in the earth's crust is 2.3%-2.8%), the similar positions of sodium and lithium in the periodic table, the similar physical and chemical properties, and the rapid rise in the price of lithium raw materials and other factors , develop and develop sodium-ion batteries with low price and stable cycle performance, and apply them to the field of large-scale energy storage technology of secondary batteries, which has great commercial value and potential for sustainable utilization. [0003] The currently developed anode materials for sodium-ion batteries mainly include carbon materials, organic materials, non-metallic elements, intercalated transition metal o...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M10/054H01M10/0568H01M10/0569
CPCH01M4/38H01M10/054H01M10/0568H01M10/0569H01M2300/0028H01M2300/0037Y02E60/10
Inventor 李福军王晨晨王刘彬袁月雷凯翔陈军
Owner NANKAI UNIV
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