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Binder‐Free Nanoparticulate Coating of a Polyethylene Separator via a Reactive Atmospheric Pressure Plasma for Lithium‐Ion Batteries with Improved Performances
Author(s) -
Qin Sicheng,
Wang Ming,
Wang Chaoliang,
Jin Yichao,
Yuan Nana,
Wu Zhuangchun,
Zhang Jing
Publication year - 2018
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201800579
Subject(s) - materials science , polyolefin , coating , separator (oil production) , electrolyte , chemical engineering , atmospheric pressure plasma , wetting , lithium ion battery , polyethylene , composite material , atmospheric pressure , surface modification , thermal stability , ion , ionic conductivity , lithium (medication) , plasma , battery (electricity) , electrode , layer (electronics) , organic chemistry , chemistry , oceanography , engineering , power (physics) , quantum mechanics , physics , endocrinology , medicine , thermodynamics , geology
A reactive atmospheric pressure plasma containing Ar/O 2 /hexamethyldisiloxane is applied to coat polyethylene (PE) separators for lithium‐ion batteries. The PE separator moves through the plasma region roll‐to‐roll, and its top and internal fiber surface is coated with a thin SiO x C y H z film composed of nanoparticulates with an average size of ≈100 nm. The nanoparticulate film has relatively high heat resistance, which provides a PE separator capable of structural support with improved thermal stability. Meanwhile, the polar functional groups on the PE surface improve its crucial properties such as wettability, electrolyte uptake, and ionic conductivity. A mere 3 min of coating endows the lithium‐ion battery with a lower interface resistance and improved C‐rate and cycling performances. Most importantly, the binder‐free coating method provides a new, eco‐efficient way to improve the performances of polyolefin separators for lithium‐ion batteries.