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Eutectic solvent electrolyte, preparation method and lithium metal battery

A low eutectic solvent and electrolyte technology, applied in non-aqueous electrolyte batteries, lithium batteries, secondary batteries, etc., can solve problems such as lithium dendrite growth and electrolyte flammability, and achieve a large electrochemical window and low cost. , the effect of high safety

Active Publication Date: 2021-01-19
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above deficiencies in the prior art, the object of the present invention is to provide a deep eutectic solvent electrolyte and its preparation method and lithium metal battery, aiming to solve the problems of flammability and lithium dendrite growth in the existing electrolyte

Method used

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  • Eutectic solvent electrolyte, preparation method and lithium metal battery
  • Eutectic solvent electrolyte, preparation method and lithium metal battery
  • Eutectic solvent electrolyte, preparation method and lithium metal battery

Examples

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Effect test

Embodiment 1

[0050] Stir lithium bistrifluorosulfonylimide and N-methylacetamide at 60°C in a molar ratio of 1:4 until clear and transparent, then add 10%wt fluoroethylene carbonate to prepare a deep eutectic solvent electrolysis liquid.

[0051] The anti-oxidation potential of the deep eutectic solvent electrolyte prepared in this example can reach 4.9V.

[0052] The prepared deep eutectic solvent electrolyte is used as the electrolyte of the lithium metal battery, the lithium metal is used as the negative electrode of the lithium metal battery, and the lithium iron phosphate is used as the positive electrode of the lithium metal battery to build the lithium metal battery.

[0053] A full battery test was carried out on the built lithium metal battery. After testing, it was found that the Coulombic efficiency of the lithium metal battery can reach 99.9%, and the cycle life can reach 2000 cycles.

[0054] figure 1 It is the linear sweep voltammogram of the electrolyte solution of this em...

Embodiment 2

[0056] Stir lithium bistrifluorosulfonyl imide and butyrolactam at a molar ratio of 1:3 at 60°C until clear and transparent, and then add 5%wt fluoroethylene carbonate to prepare a deep eutectic solvent electrolyte.

[0057] The anti-oxidation potential of the deep eutectic solvent electrolyte prepared in this example can reach 4.8V.

[0058] The prepared deep eutectic solvent electrolyte is used as the electrolyte of the lithium metal battery, the metal lithium is used as the negative electrode, and the lithium manganate is used as the positive electrode of the lithium metal battery to construct the lithium metal battery.

[0059] A full-battery test was carried out on the built lithium metal battery. After testing, it was found that the Coulombic efficiency of the lithium metal battery can reach 99%, and the cycle life can reach 400 cycles.

[0060] Figure 5 It is the linear sweep voltammogram of the electrolyte solution of this embodiment. Image 6 It is the lithium depo...

Embodiment 3

[0062] Lithium bisfluorosulfonyl imide and acetamide were stirred at 60°C at a molar ratio of 1:5 until clear and transparent, and then 5%wt fluoroethylene carbonate was added to prepare a deep eutectic solvent electrolyte.

[0063] The anti-oxidation potential of the deep eutectic solvent electrolyte prepared in this example can reach 4.9V.

[0064] The prepared deep eutectic solvent electrolyte is used as the electrolyte of the lithium metal battery, the lithium metal is used as the negative electrode of the lithium metal battery, and the lithium nickel manganese oxide is used as the positive electrode of the lithium metal battery to build the lithium metal battery.

[0065] A full-battery test was carried out on the built lithium metal battery. After testing, it was found that the Coulombic efficiency of the lithium metal battery can reach 99%, and the cycle life can reach 300 cycles.

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Abstract

The invention discloses a eutectic solvent electrolyte, a preparation method and a lithium metal battery. The eutectic solvent electrolyte comprises a lithium salt, an amide compound and an additive,wherein the molar ratio of the lithium salt to the amide compound is 1: 1-1: 10; and the additive comprises a cyclic carbonate compound. According to the invention, the lithium salt and the amide compound in a predetermined molar ratio are blended to form the eutectic solvent electrolyte. The eutectic solvent electrolyte has the advantages of incombustibility, high conductivity, large electrochemical window and the like; when the electrolyte is applied to the lithium metal battery, rapid migration and spherical deposition of lithium ions in the electrolyte can be realized, lithium dendrites donot grow, the cycle life is long, and meanwhile, the eutectic solvent electrolyte is relatively low in cost and high in safety, and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a deep eutectic solvent electrolyte, a preparation method and a lithium metal battery. Background technique [0002] The rapid development of new energy electric vehicles and energy storage systems requires high-energy batteries with ultra-high theoretical specific energy capacity (3860mAh g -1 ) and the lowest electrochemical potential [−3.04 V versus the standard hydrogen electrode], Li metal anodes are considered promising materials for next-generation high-energy batteries. However, the uneven deposition of lithium metal batteries during the lithium electroplating process will lead to the growth of lithium dendrites and reduce the Coulombic efficiency (CE). In order to solve the safety problems caused by lithium dendrites, researchers have proposed a variety of solutions: promote the rapid transmission and uniform deposition of lithium ions by changing the electrolyte form...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0568H01M10/0569H01M10/0567H01M10/42H01M10/052
CPCH01M10/052H01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/4235H01M2300/0025Y02E60/10
Inventor 吴万宝张嘉恒李明雨王密喻文
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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