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Lithium metal interface modification method for room-temperature solid-state battery

A solid-state battery and interface modification technology, applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, sustainable manufacturing/processing, etc., to achieve the effect of reducing interface impedance, reducing interface impedance, and easy mass production

Inactive Publication Date: 2020-05-26
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of existing solid-state batteries, the present invention provides a feasible process method of solid-state batteries at room temperature, the process is simple and the cost is low

Method used

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  • Lithium metal interface modification method for room-temperature solid-state battery
  • Lithium metal interface modification method for room-temperature solid-state battery
  • Lithium metal interface modification method for room-temperature solid-state battery

Examples

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Effect test

Embodiment 1

[0032] This embodiment provides a method for modifying the lithium metal interface of a room temperature solid-state battery, which specifically includes the following steps:

[0033] PEO:LiClO 4 : LLZTO (the molecular weight of PEO is: 10000) is added 9mL of acetonitrile solution according to the weight ratio of 0.4:0.2:0.6, stirred at 500rpm in argon atmosphere to make it uniformly dispersed, according to figure 1 Assemble the battery, add 5uL of 10mol L between the negative electrode and the composite electrolyte -1 Lithium metal modified with LITFSI / AN solution and dried at 40°C. Its electrochemical performance was tested at 30 °C.

[0034] figure 1 A schematic diagram of a solid-state battery (button battery), using lithium iron phosphate (LFP) as the positive electrode, using a very small amount (5 μL) of 10M LiTFSI:AN to wet the surface of lithium metal, and then using the modified lithium metal as the negative electrode of the solid-state battery, assemble Into LFP...

Embodiment 2

[0039] This embodiment provides a method for modifying the lithium metal interface of a room temperature solid-state battery, which specifically includes the following steps:

[0040] Add 9 mL of chloroform solution to PEO:LiTFSI:LLZTO (the molecular weight of PEO is: 50000) according to the weight ratio of 0.4:0.3:0.6, and stir at 300 rpm in a hydrogen-argon atmosphere to make it uniformly dispersed. figure 1 Assemble the battery, add 15uL of 12mol L between the negative electrode and the composite electrolyte -1 Lithium metal modified with LITFSI / AN solution and dried at 50°C. Its electrochemical performance was tested at 30 °C.

Embodiment 3

[0042] This embodiment provides a method for modifying the lithium metal interface of a room temperature solid-state battery, which specifically includes the following steps:

[0043] PEO:LiTPF 6 : LLZTO (the molecular weight of PEO is: 100000) is added 9mL of dichloroethane solution according to the weight ratio of 0.4:0.25:0.6, and the helium atmosphere is ultrasonically dispersed to make it uniformly dispersed. figure 1 Assemble the battery, add 7.5uL of 12mol L between the negative electrode and the composite electrolyte -1 Lithium metal modified with LITFSI / AN solution and dried at 60°C. Its electrochemical performance was tested at 30 °C.

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Abstract

The invention relates to a lithium metal interface modification method for a room-temperature solid-state battery, which comprises the steps of S1, adding PEO, LLZTO and a lithium salt into an organicsolvent in an oxygen-free atmosphere to assemble a battery with a negative electrode and a composite electrolyte; and S2, adding an LITFSI / AN solution between the negative electrode of the battery and the composite electrolyte, modifying lithium by using LITFSI, and drying. By adopting the method provided by the invention, the lithium metal interface modification method for the solid-state battery can be provided, lithium dendrites can be inhibited according to the method, the interface impedance can be effectively reduced, and the solid-state battery can work at room temperature. The methodhas the beneficial details that solid-state battery configuration design is performed on a solid-state battery which is high in interface impedance and cannot work at room temperature, so that the electrochemical performance of the solid-state battery is effectively improved.

Description

technical field [0001] The invention relates to a method for modifying the lithium metal interface of a room-temperature solid-state battery, and belongs to the technical field of battery manufacturing. Background technique [0002] With the extensive use and depletion of fossil fuels, the development and effective use of green renewable energy and environmental protection have become issues of common concern worldwide. The development of secondary batteries that can realize efficient energy storage and conversion is not only related to national economic development and strategic security, but also closely related to people's lives, so it has received extensive attention at home and abroad. Lithium-ion secondary batteries are widely used in consumer electronics due to their high energy density, long cycle life, small self-discharge, no memory effect, wide operating temperature, and low cost. In the context of the rapid development of energy storage, higher expectations are ...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 谭迎宾李铮铮刘俊亮
Owner BAOSHAN IRON & STEEL CO LTD
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