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Preparation method of modified separator for lithium ion battery

A lithium-ion battery and separator technology, applied in battery pack parts, separators/films/diaphragms/spacers, circuits, etc., can solve the problems of large pores, poor thermal stability, low surface energy and hydrophobicity, etc. Achieve the effect of wide electrochemical window, high ionic conductivity, and improved wettability

Active Publication Date: 2019-01-01
SHANDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the unfavorable factors of commercial polyolefin separators mainly include: polyolefin separators, especially those prepared by dry stretching method, have large pores, which are not conducive to the storage of electrolyte; due to the low surface energy and hydrophobicity of polyolefin materials, , so that it has poor wettability to the electrolyte and poor thermal stability, which affects the safety performance of the battery

Method used

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  • Preparation method of modified separator for lithium ion battery
  • Preparation method of modified separator for lithium ion battery
  • Preparation method of modified separator for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of garnet-type solid electrolyte LLZO

[0036] 7.24g LiNO 3 , 19.48g La(NO 3 ) 3 , 6.94g ZrO(NO 3 ) 2 Dissolve in 300ml deionized water and mechanically stir at 100°C to completely dissolve the solid. After the solid was fully dissolved, 37.83g of citric acid and 0.36mol of ethylene glycol were added, the temperature was raised to 120°C, and mechanical stirring was continued to carry out the evaporation reaction for 12 hours. When the reaction solution was about 80ml, the reaction was stopped to obtain a precursor gel. Transfer the obtained precursor gel to a crucible, put it into a muffle furnace for calcination, and calcine at 400°C and 800°C for 5h respectively; after calcination, grind it into a powdery solid; put the powdery solid at 1050°C After sintering for 12 hours, the garnet-type solid electrolyte LLZO was obtained.

[0037] (2) Preparation of coating material

[0038] Take 0.153g garnet-type solid electrolyte LLZO as a filler, 0.153g PVD...

Embodiment 2

[0044] (1) Preparation of garnet-type solid electrolyte LLZO

[0045] 9.31g LiNO 3 , 19.48g La(NO 3 ) 3 , 6.94g ZrO(NO 3 ) 2 Dissolve in 300ml deionized water and mechanically stir at 100°C to completely dissolve the solid. After the solid was fully dissolved, 37.83g of citric acid and 0.36mol of ethylene glycol were added, the temperature was raised to 110°C, and mechanical stirring was continued for evaporating reaction for 14 hours. When the reaction solution was about 80ml, the reaction was stopped to obtain a precursor gel. Transfer the obtained precursor gel to a crucible, put it into a muffle furnace for calcination, and calcine at 350°C and 750°C for 6h respectively; after calcination, grind it into a powdery solid; put the powdery solid at 1000°C After sintering for 14 hours, the garnet-type solid electrolyte LLZO was obtained.

[0046] (2) Preparation of coating material

[0047] Take 0.32g garnet-type solid electrolyte LLZO as a filler, 0.16g PVDF as a binder...

Embodiment 3

[0051] (1) Preparation of garnet-type solid electrolyte LLZO

[0052] 9.31g LiNO 3 , 19.48g La(NO 3 ) 3 , 6.94g ZrO(NO 3 ) 2 Dissolve in 300ml deionized water and mechanically stir at 100°C to completely dissolve the solid. After the solid was fully dissolved, 37.83g of citric acid and 0.42mol of ethylene glycol were added, the temperature was raised to 130°C, and mechanical stirring was continued for 10 hours of evaporation reaction. When the reaction solution was about 80ml, the reaction was stopped to obtain a precursor gel. The resulting precursor gel was transferred to a crucible, put into a muffle furnace for calcination, and calcined at 450°C and 850°C for 4 hours respectively; after calcining, it was ground to form a powdery solid; the powdery solid was then heated at 1100°C After sintering for 10 hours, the garnet-type solid electrolyte LLZO was obtained.

[0053] (2) Preparation of coating material

[0054] Take 0.3g garnet-type solid electrolyte LLZO as a fil...

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Abstract

The invention belongs to the technical field of lithium ion battery separators, in particular to a preparation method of a modified separator for a lithium ion battery, and the method comprises the following steps: dissolving LiNO3, La (NO3)3 and ZrO(NO3)2 in deionized water, adding citric acid and ethylene glycol, evaporating to generate precursor gel, calcining to generate garnet powder, and sintering to obtain a garnet-type solid electrolyte LLZO; adding garnet-type solid electrolyte LLZO to a solvent, adding a binder and stirring to prepare a coating material; coating the coating materialon the surface of the separator, and drying at room temperature, thereby obtaining the lithium ion battery modified separator. The garnet-type solid electrolyte LLZO is coated on the separator as a coating layer, the pores of the separator are reduced in size, and the smaller pores can absorb more electrolyte under the capillary action; and the heat resistance of the separator is improved, the hydrophobicity of the separator is reduced, and the wettability of the separator to the electrolyte is better.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and in particular relates to a preparation method of a lithium-ion battery modified diaphragm. Background technique [0002] Lithium-ion batteries have high energy density and long cycle life, and are widely used in the field of electronic equipment. As a key part of the lithium battery, the lithium-ion battery separator mainly plays the role of isolating the positive and negative electrodes, preventing the battery from short circuiting, retaining the electrolyte, and allowing lithium ions to pass through. At present, commercial lithium battery separators are mainly polyolefin porous membranes, such as polyethylene (PE) and polypropylene (PP). Although such separators have the advantages of good chemical inertness, easy processing, and low cost, polyolefin materials cannot To meet people's needs, the low surface energy and hydrophobicity and the stretching pore-forming pro...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/40H01M50/403H01M50/497
CPCH01M50/403H01M50/409Y02E60/10
Inventor 穆洁尘韩开茹张丽鹏张铁柱葛文庆张小杰张君楠
Owner SHANDONG UNIV OF TECH
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