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Acidification reaction modification method for surface of solid electrolyte

A solid electrolyte and reaction technology, used in non-aqueous electrolyte batteries, circuits, electrical components, etc., can solve the problems of limited interface impedance reduction, high equipment requirements, and complex preparation processes.

Inactive Publication Date: 2020-07-07
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have improved some problems to a certain extent, but there are also problems such as complex preparation process, high equipment requirements, limited interface impedance reduction, and poor battery cycle performance.

Method used

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  • Acidification reaction modification method for surface of solid electrolyte
  • Acidification reaction modification method for surface of solid electrolyte
  • Acidification reaction modification method for surface of solid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) The newly sintered Garnet-type solid electrolyte Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 Ceramic discs (discs with a diameter of 1.4 cm) were left in air for 24 h. Add 10 μL of the prepared aqueous solution with a phosphoric acid content of 30% to the surface of the ceramic sheet (converted to a unit area addition of 6.5 μL / cm 2 ), after 10 minutes, wash with ethanol and dry in an oven at 60°C;

[0045] (2) Move the solid electrolyte obtained in step (1) into a glove box, attach a lithium sheet to the surface of the acid-treated ceramic sheet, heat the temperature to 200 ° C, and let the lithium melt and cool naturally after good contact;

[0046] (3) Steps (1) and (2) are performed on both sides of the solid electrolyte, and then a 2025-type button battery is assembled to obtain an all-solid lithium symmetric battery.

[0047] The solid electrolyte before and after acid treatment was characterized by SEM and ATR-FTIR, as shown in Figure 1a and 1b As shown, it can be...

Embodiment 2

[0049] (1) The newly sintered Garnet-type solid electrolyte Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 Ceramic discs (discs with a diameter of 1.4 cm) were left in air for 24 h. Add 10 μL of the prepared aqueous solution with a phosphoric acid content of 30% to the surface of the ceramic sheet (converted to a unit area addition of 6.5 μL / cm 2 ), after 30min, wash with ethanol and dry in a 60°C oven;

[0050] Step (2) and step (3) are the same as step (2) and step (3) of embodiment 1.

[0051] Battery performance evaluation:

[0052] Electrochemical AC impedance spectroscopy test was carried out on the lithium symmetrical battery at 25°C, using the constant potential method, the frequency was from 0.1Hz to 1Mhz, the results were as follows figure 2 shown. It can be seen from the figure that the interface impedance of the battery is less than 20Ohm / cm 2 .

Embodiment 3

[0054] (1) The newly sintered Garnet-type solid electrolyte Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 Ceramic discs (discs with a diameter of 1.4 cm) were left in air for 24 h. Add 10 μL of the prepared aqueous solution with a phosphoric acid content of 50% to the surface of the ceramic sheet (converted to a unit area addition of 6.5 μL / cm 2 ), after 10 minutes, wash with ethanol and dry in an oven at 60°C;

[0055] Step (2) and step (3) are the same as step (2) and step (3) of embodiment 1.

[0056] Battery performance evaluation:

[0057] Perform electrochemical AC impedance spectroscopy test on lithium symmetric batteries at 25°C, constant potential method, frequency from 0.1Hz to 1Mhz, the results show that the interface impedance is less than 20Ohm / cm 2 . Carry out constant current test on the battery at 25°C, the current density is 0.1mA / cm 2 , the single charge and discharge time is 30min, and then repeated cycles under the same conditions. The results are attached ima...

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Abstract

The invention relates to an acidification reaction modification method for the surface of a solid electrolyte. The method comprises the steps of performing surface pre-passivation on the solid electrolyte in air to form a pre-passivation layer, wherein the solid electrolyte is an inorganic crystalline oxide solid electrolyte and is preferably selected from at least one of a garnet type solid electrolyte, a LISICON type solid electrolyte, a NASICON type solid electrolyte and a perovskite type solid electrolyte; and distributing an acid solution on the surface of the pre-passivation layer of thesolid electrolyte, and carrying out a quasi-solid-phase neutralization reaction to generate a solid electrolyte modification layer on the surface of the solid electrolyte.

Description

technical field [0001] The invention belongs to the field of solid-state lithium metal batteries, and in particular relates to a method for modifying the surface of a solid electrolyte by an acidification reaction, a solid electrolyte prepared by the method, and an application of the solid electrolyte in a solid-state lithium metal battery. Background technique [0002] Lithium-ion batteries have been widely used as an energy storage device in various fields, especially in portable electronics and electric transportation. However, commercial lithium-ion batteries mostly use graphite as the negative electrode, and the capacity and energy density are relatively limited, which seriously hinders the further development of batteries. In order to overcome this limitation, lithium metal batteries with lithium metal as the negative electrode stand out, because lithium metal has high theoretical specific capacity (3860mAh / g) and low reduction potential (-3.04V) (X.B.Cheng, et.al.Chem...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/052
CPCH01M4/505H01M4/525H01M10/052Y02E60/10
Inventor 温兆银阮亚东卢洋靳俊
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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