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Electrolyte solution and double-ion battery

An electrolyte and dual-ion technology, applied in the field of electrochemistry, can solve the problem that the capacity and cycle performance of anion intercalated graphite electrodes have not been effectively improved, and achieve improved Coulombic efficiency and cycle performance, good anti-oxidation performance, excellent anti-oxidation performance. oxidative effect

Inactive Publication Date: 2017-08-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the capacity and cycle performance of anion-intercalated graphite electrodes based on organic solvents and lithium salts as electrolytes have not been effectively improved.

Method used

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  • Electrolyte solution and double-ion battery
  • Electrolyte solution and double-ion battery
  • Electrolyte solution and double-ion battery

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preparation example Construction

[0042] In the present invention, there is no special limitation on the preparation method of the double-ion battery, and the method for preparing the double-ion battery known to those skilled in the art can be used. The specific steps are preferably: disposing the above-mentioned electrolyte solution in a glove box, and assembling a graphite positive electrode, a negative electrode, a diaphragm and the electrolyte solution into a dual-ion battery.

[0043] Charge and discharge tests are performed on the dual-ion battery provided by the present invention to characterize the capacity and cycle performance of the dual-ion battery. Experimental results show that the dual-ion battery provided by the invention has a capacity of 3mAh / g-110mAh / g, and the capacity retention rate after 700 cycles is 95%.

Embodiment 1

[0047] Configure 1mol / L lithium hexafluorophosphate solution in the glove box, wherein the solvent of the solution is a mixed solvent of methyl isopropyl sulfone and ethyl methyl carbonate, and the volume content of methyl isopropyl sulfone is 20%, the above configuration The good solution was left in the glove box for one day. Using the above solution as the electrolyte, a dual-ion battery was fabricated in a glove box, wherein the positive electrode was graphite, the negative electrode was lithium sheet, and the separator was glass fiber.

Embodiment 2

[0049] Configure 1mol / L lithium hexafluorophosphate solution in the glove box, wherein the solvent of the solution is a mixed solvent of methyl isopropyl sulfone and ethyl methyl carbonate, and the volume content of methyl isopropyl sulfone is 40%, the above configuration The good solution was left in the glove box for one day. Using the above solution as the electrolyte, a dual-ion battery was fabricated in a glove box, wherein the positive electrode was graphite, the negative electrode was lithium sheet, and the separator was glass fiber.

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Abstract

The invention provides an electrolyte solution. The electrolyte solution comprises an electrolyte and an organic solvent. The organic solvent includes a mixture of a chained sulfone and a chained carbonate. The mixture of the chained sulfone and chained carbonate is used as the organic solvent of the electrolyte solution so that the chained sulfone has excellent oxidation resistance, oxidation resistance of the electrolyte solution is improved and coulombic efficiency and cycle performances of a double-ion battery are effectively improved. The chained carbonate has low viscosity, and can improve conductivity and cell high-rate performance of the electrolyte solution so that through cooperation, the prepared double-ion battery has a good cell capacity and the cycle performances.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, and more specifically relates to an electrolyte solution and a double-ion battery. Background technique [0002] Dual-ion battery is an energy storage device based on the reversible electrochemical reaction of anion and cation on the positive and negative electrodes respectively. It is a new type of secondary battery with anion-intercalated graphite as the positive electrode. With the development and utilization of new energy sources, dual-ion batteries with easy-to-obtain electrode materials, environmental friendliness, and large-scale energy storage have become the focus of research in recent years. The electrodes of dual-ion batteries are divided into carbon-based materials, metal compounds, small organic molecules, polymers, and the like. Among them, the dual-ion battery with graphite as the positive electrode has the advantages of stable electrode structure and high reversible pote...

Claims

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Application Information

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IPC IPC(8): H01M10/0569
CPCH01M10/0569H01M2300/0037Y02E60/10
Inventor 王宏宇樊慧
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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