Diaphragm, preparation method thereof and secondary battery

By applying hydrophobically modified metal oxides to form a solid electrolyte layer on the separator body, the problem of excessive moisture content of the oxide solid electrolyte coating separator is solved, and the performance of the secondary battery is significantly improved.

CN119674423APending Publication Date: 2025-03-21NIO BATTERY TECH (ANHUI) CO LTD
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Patent Information

Application Number
CN202311230280.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-21
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

The existing oxide solid electrolyte-coated separators have excessive moisture content due to hydrophilic properties, which affects the cycling and safety performance of the battery.

Method used

By applying hydrophobically modified metal oxides to the separator body and forming a solid electrolyte layer, the moisture content value of the solid electrolyte coated separator is reduced. The modified metal oxide includes a metal oxide and a silane compound attached to the surface of the metal oxide.

Benefits of technology

It significantly reduces the moisture content of the diaphragm, alleviates the negative impact of moisture on battery performance, improves the Coulomb efficiency and circulation performance of the secondary battery, and improves the safety performance of the battery.

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Abstract

The invention relates to a diaphragm, a preparation method thereof, a secondary battery and a device. The diaphragm provided by the invention comprises a diaphragm body; the solid electrolyte layer is arranged on the diaphragm body, the solid electrolyte layer comprises a modified metal oxide, the modified metal oxide comprises a metal oxide and a silane compound connected to the surface of the metal oxide, and the silane compound is connected to the surface of the metal oxide. The metal oxide comprises at least one of lithium aluminum titanium phosphate, lithium lanthanum zirconium oxide, lithium lanthanum zirconium tantalum oxide, lithium lanthanum zirconium aluminum oxide, lithium lanthanum titanium oxide, lithium aluminum germanium phosphate and lithium lanthanum aluminum titanate. According to the invention, the hydrophobic modified metal oxide is coated on the diaphragm body and the solid electrolyte layer is formed, so that the moisture value of the solid electrolyte coated diaphragm is remarkably reduced, the negative influence of the moisture of the diaphragm on the battery performance is relieved, and the coulombic efficiency and the cycle performance of the secondary battery using the diaphragm are improved.
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