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A kind of flame retardant electrolyte and dual-ion battery

An electrolyte and flame-retardant technology, which is applied in the field of electrochemistry, can solve the problems of lithium-ion battery capacity decline and other problems, and achieve the effects of excellent oxidation resistance, increased solubility, and delayed flammability

Active Publication Date: 2021-05-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In conventional lithium-ion battery systems, when flame retardants are added to organic solvents to retard flame retardancy, the capacity of lithium-ion batteries usually decreases to a certain extent; however, organic solvents have not been used in dual-ion battery systems. Literature Report on Adding Flame Retardant to Solvent as Electrolyte

Method used

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  • A kind of flame retardant electrolyte and dual-ion battery
  • A kind of flame retardant electrolyte and dual-ion battery
  • A kind of flame retardant electrolyte and dual-ion battery

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preparation example Construction

[0047] 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 flame-retardant electrolyte in a glove box, and assembling the graphite positive electrode, negative electrode, diaphragm and the flame-retardant electrolyte into a dual-ion battery.

[0048] 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 result shows, the dual-ion battery capacity of the flame-retardant electrolyte of lithium hexafluorophosphate electrolyte provided by the invention is 50mAh g -1 ~100mAh g -1 , after 100 cycles, the Coulombic efficiency is greater than 95%, and the capacity retention rate is above 95%. The capacity and cycle performance of the...

Embodiment 1

[0054] A 1 mol / L (M) lithium hexafluorophosphate solution was prepared in a glove box, wherein the solvent of the solution was ethyl methyl carbonate, and the prepared solution was allowed to stand for 12 hours. With above-mentioned solution as electrolyte, make dual-ion battery in glove box, wherein, positive electrode is graphite, negative electrode is lithium sheet, diaphragm is glass fiber; Get described electrolyte 1mL, drip on 55mg round medical cotton, in air Ignite it with the most common commercially available lighter, and use a stopwatch to record the time from the beginning of burning to the natural extinguishment of medical cotton, which is referred to as the burning self-extinguishing time here.

Embodiment 2

[0056] Configure 1mol / L lithium hexafluorophosphate solution in the glove box, wherein the solvent of the solution is a mixed solvent of ethyl methyl carbonate and trimethyl phosphate, and the volume content of ethyl methyl carbonate is 80%. Leave for 12 hours. With above-mentioned solution as electrolyte, make dual-ion battery in glove box, wherein, positive electrode is graphite, negative electrode is lithium sheet, diaphragm is glass fiber; Get described electrolyte 1mL, drip on 55mg round medical cotton, in air Light it with the most common commercially available lighter, and record the burning self-extinguishing time with a stopwatch.

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Abstract

The invention relates to the technical field of electrochemistry, and relates to a flame-retardant electrolyte and a double-ion battery. The flame-retardant electrolyte solution of the present invention includes an electrolyte and an organic solvent; the organic solvent includes methyl propionate and trimethyl phosphate, or a mixture of carbonate and trimethyl phosphate. In the flame-retardant electrolyte, increasing the concentration of the electrolyte can simultaneously maintain the strength of the anion intercalation and reduce the flammability, ultimately without sacrificing the capacity of the dual-ion battery and delaying the flammability, improving the use of the dual-ion battery safety. The experimental results show that reducing the proportion of methyl propionate or carbonate in the organic solvent provided by the invention in the electrolyte improves the electrolyte concentration in the electrolyte provided by the invention, and the performance of the double ion battery provided by the invention is the same as that without adding flame retardant The performance and capacity of the dual-ion battery of the agent are basically the same (±5mAh g ‑1 Within), the flammability of the electrolyte provided by the present invention is delayed compared with conventional electrolytes without adding flame retardants.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, and more specifically relates to a flame-retardant electrolyte and a double-ion battery. Background technique [0002] A dual-ion battery is an energy storage device based on the reversible electrochemical reaction of anion and cation at the interface between the positive and negative electrodes and the electrolyte. It is a new type of rechargeable battery that uses anion-intercalated graphite as the positive electrode. With the adjustment of social energy structure and the development and utilization of various new energy sources, dual-ion batteries have become the focus of research because of their advantages of easy availability of electrode materials, environmental friendliness and large-scale energy storage. The electrodes of dual-ion batteries can be divided into metal compounds, carbon materials, polymers, etc. At this stage, graphite is the most common cathode material for dual-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/054H01M10/058H01M10/42
CPCH01M10/054H01M10/0567H01M10/0569H01M10/058H01M10/4235H01M2300/0037Y02E60/10Y02P70/50
Inventor 王宏宇张磊
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI