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Solid-state lithium ion conductor, preparation method and application thereof

A technology of ionic conductors and solid lithium, applied in the direction of non-metallic conductors, oxide conductors, chemical instruments and methods, etc., can solve the problems of low room temperature lithium ion conductivity, metal lithium deposition, large interface contact resistance, etc., to achieve improved cycle Performance, protection of lithium metal, and effect of reducing interface contact resistance

Active Publication Date: 2019-10-11
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention solves the problem that in the prior art, the room temperature lithium ion conductivity of the solid conductor is low, the interfacial contact resistance between the solid conductor and the electrode is large, and the high electronic conductivity will lead to the direct deposition of metal lithium inside the solid electrolyte. question

Method used

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  • Solid-state lithium ion conductor, preparation method and application thereof
  • Solid-state lithium ion conductor, preparation method and application thereof
  • Solid-state lithium ion conductor, preparation method and application thereof

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preparation example Construction

[0036] The preparation method of a kind of solid lithium ion conductor of the present invention comprises the following steps:

[0037] (1) dissolving an organolithium salt containing fluorine atoms in an ether organic solvent to obtain an electrolyte;

[0038] (2) adding the alkylaluminum solution to the electrolytic solution described in step (1) to obtain a solution; under an inert gas atmosphere, adding LiOH powder to the solution, after sufficient reaction, to obtain a solid lithium ion conductor, The solid lithium ion conductor contains LiAlO 2 and Li 3 AlO 3 polycrystalline composites.

[0039] The organolithium salt containing fluorine atoms described in step (1) is lithium bistrifluoromethanesulfonimide, lithium bisfluorosulfonimide or lithium hexafluorophosphate, and the ether organic solvent is diglyme solution or Tetraethylene glycol dimethyl ether, the concentration of the electrolyte is 0.5mol / L-5mol / L; the aluminum alkyl in step (2) is triethylaluminum or tr...

Embodiment 1

[0054] The preparation method of the solid-state lithium ion conductor is as follows: In this embodiment, a glove box is used as the atmosphere environment, and 2.87 g of bistrifluoromethanesulfonylimide lithium salt is dissolved in 10 mL of diethylene glycol dimethyl ether electrolyte, and stirred at room temperature for 12 h After that, get 1.0molL -1 of electrolyte. Then add 0.05-2 mL of triethylaluminum solution with a concentration of 1 mol / L to the above electrolytic solution and stir for 6 hours to obtain solution A. The concentration of alkylaluminum in solution A is 5-200 mmol / L, and weigh 3.6-144 mg Add LiOH powder into solution A and stir for 1 h to complete the reaction. After the reaction was complete, a white powder was obtained, which was rinsed three times with diethylene glycol dimethyl ether to remove residual triethylaluminum, and then placed in a glove box to dry naturally. Take 5-30 mg of the above powder and apply a pressure of 5-15 MPa to press it into...

Embodiment 2

[0062] Prepare a layer of 40-150um solid lithium ion conductor on the surface of lithium metal obtained in Example 1, and press two lithium sheets containing the solid lithium ion conductor face to face to assemble a lithium-lithium symmetric battery. In close contact with each other, 3 to 5 layers of foamed nickel are tightly pressed on one side of the lithium sheet.

[0063] After the battery is installed, let it stand for 6 hours, and conduct a charge and discharge test on the LAND-CT2001A tester, with a current density of 0.2mAcm -2 , capacity limit 0.4mAh cm -2 . After 70 cycles, the lithium metal surface is smooth without cracks, and no lithium dendrites appear, such as Figure 5 . Even after cycling for 1200h, the battery can still basically remain stable, and the polarization voltage is below 0.04V, such as Figure 6 .

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Abstract

The invention relates to a solid-state lithium ion conductor, a preparation method and application thereof, and belongs to the field of secondary batteries. LiOH reacts with alkyl aluminum to obtain the solid-state lithium ion conductor of a polycrystal compound containing LiAlO2 and Li3AlO3. Preferably, the reaction is performed in a liquid electrolyte, and the electrolyte is a solution obtainedby dissolving a lithium salt into an organic solvent. Preferably, LiOH is obtained by a lithium on-chip in-situ reaction or powdery LiOH. Electrodes of the solid-state lithium ion conductor prepared in the invention are high in ionic conductivity at room temperature and low in electronic conductivity, and the solid-state lithium ion conductor is tightly combined with lithium metal so that the interface contact resistance can be greatly reduced. The prepared solid-state lithium ion conductor is applied into metal lithium batteries, the problem of lithium dendrites can be improved effectively and obviously, and lithium metal is protected, so that the cycle performance of the metal lithium batteries is promoted comprehensively. The solid-state lithium ion conductor prepared by the method doesnot need heating, the preparation technology is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the field of secondary batteries, and more specifically relates to a solid lithium ion conductor and its preparation method and application. Background technique [0002] In recent years, new energy electric vehicles have developed vigorously, but the current commercial lithium-ion battery technology is difficult to meet the needs of electric vehicles with long cruising range. Therefore, the development of new battery technologies with high energy density and high output power has attracted extensive attention in the industry. [0003] Lithium metal batteries such as lithium-sulfur batteries and lithium-air batteries have high energy density and are expected to be used in electric vehicles and other energy storage systems in the future. Lithium metal has a high theoretical specific capacity (3860mAhg -1 ) and an extremely low electrochemical potential battery (-3.04 V versus a standard hydrogen electrode), but there are still...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525H01M12/08H01B1/08C01F7/04
CPCC01F7/043H01B1/08H01M10/0525H01M10/0562H01M12/08Y02E60/10
Inventor 沈越谢美兰黄云辉
Owner HUAZHONG UNIV OF SCI & TECH
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