Method for improving lithium dendrite at solid electrolyte interface with carbon fluoride

A technology of solid electrolyte and carbon fluoride, which is applied in the manufacture of composite electrolytes, non-aqueous electrolyte batteries, and electrolyte batteries, etc., achieving the effects of short time consumption, simple and reliable operation methods, and excellent efficiency improvement

Active Publication Date: 2019-12-20
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the high resistance of the solid-solid electrode-electrolyte interface and the penetration of lithium dendrites, and provides a method for improving lithium dendrites at the solid electrolyte interface by carbon fluoride

Method used

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  • Method for improving lithium dendrite at solid electrolyte interface with carbon fluoride
  • Method for improving lithium dendrite at solid electrolyte interface with carbon fluoride
  • Method for improving lithium dendrite at solid electrolyte interface with carbon fluoride

Examples

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Embodiment

[0026] Dissolve the positive electrode active material LFP, conductive agent SP, and binder PVDF in a mass ratio of 8:1:1 in NMP, homogenize them, and coat them on aluminum foil, then dry, roll, and cut into pieces to make positive sheets .

[0027] Using 1-10 mg of fluorocarbon, use a polisher or manually apply fluorocarbon to Li 6.5 La 3 Zr 1.8 Ta 0.2 o 12 Garnet-type electrolyte sheet surface.

[0028] A lithium sheet is used as the negative electrode, and the modified garnet-type electrolyte sheet, positive electrode sheet, and negative electrode are assembled into a full battery, and 0-20 μL of lithium-ion electrolyte is dropped on the interface between the positive electrode sheet and the electrolyte, and the electrolyte and the negative electrode.

[0029] Depend on figure 1 It can be seen that the modified carbon fluoride is in close contact with the electrolyte sheet. Depend on figure 2 It can be seen that the unmodified solid-state battery only cycles for ab...

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Abstract

The invention discloses a method for improving lithium dendrite at a solid electrolyte interface with carbon fluoride. The method comprises the following steps: step 1, polishing a garnet electrolytesheet with sandpaper; and step 2, modifying the carbon fluoride on the polished surface of the garnet electrolyte sheet so as to obtain the garnet electrolyte sheet modified with the carbon fluoride.The garnet electrolyte sheet modified with the carbon fluoride prepared by the method can be used for assembling an all-solid-state battery based on an inorganic solid electrolyte. Compared with the methods in the prior art, the method has the following advantages: (1) the operation method is simple and reliable and the time consumption is short without using high-end instruments; and (2) the improvement efficiency is excellent and large-scale production is feasible.

Description

technical field [0001] The invention belongs to the technical field of solid electrolytes, and relates to a method for improving the performance of a garnet type solid lithium ion battery by using carbon fluoride as an intermediate layer. Background technique [0002] All-solid-state batteries (ASSBs) based on inorganic solid electrolytes offer higher safety, higher energy density, longer cycle life, and lower cost than conventional lithium-ion batteries. In addition, lithium dendrites may be suppressed due to the high shear modulus of such electrolytes. Among various Li-ion-conducting materials, cubic garnet solid-state electrolytes exhibit excellent stability to Li metal and superior Li-ion conductivity close to 1 ms cm at ambient temperature. -1 , so it is particularly attractive. However, the high resistance of the solid-solid electrode-electrolyte interface and the penetration of lithium dendrites hinder their practical applications. Adding an intermediate layer at t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0562H01M10/0525
CPCH01M10/058H01M10/0562H01M10/0525H01M2300/0088Y02E60/10Y02P70/50
Inventor 范立双杨贵业张乃庆张宇郭志坤
Owner HARBIN INST OF TECH
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