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Resin‐silica composite nanoparticle grafted polyethylene membranes for lithium ion batteries
Author(s) -
Gu QianQian,
Fu CuiLiu,
Sun ZhaoYan
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50713
Subject(s) - polyolefin , materials science , faraday efficiency , chemical engineering , separator (oil production) , composite number , polyethylene , surface modification , membrane , ceramic , contact angle , electrolyte , wetting , nanoparticle , composite material , layer (electronics) , chemistry , nanotechnology , electrode , biochemistry , physics , engineering , thermodynamics
Abstract To avoid the peeling‐off of ceramic nanoparticles (NPs) from polyolefin membranes usually occurred in commercially available ceramic NPs coated polyolefin separators for lithium batteries, we propose a simple one‐pot in‐situ reaction method to modify commercial polyethylene (PE) separators by surface grafting 3‐Aminophenol/formaldehyde (AF)/silica (SiO 2 ) composite NPs. The AF/SiO 2 composite NPs form self‐supporting connected pores on the modified layer of the separator surface, which ensures the transportation of Li + . Moreover, the PE@AF/SiO 2 separators has higher electrolyte wettability and compatibility than neat PE separators attributed to the plentiful polar functional groups in the AF/SiO 2 layer and AF/SiO 2 composite NPs, resulting in higher lithium ion transference number ( t Li + = 0.62) and ionic conductivity (σ = 0.722 mS cm −1 ). More importantly, the discharge capacity, capacity retention rate and coulombic efficiency (136.2 mA h g −1 , 87.9% and 99%, respectively) after 200 cycles of Li|NMC half batteries with PE@AF/SiO 2 separators, are all more excellent than that with the pure PE separator (125 mA h g −1 , 83.1% and 85%, respectively). Our results show that the PE@AF/SiO 2 separators obtained by this modification method have higher electrochemical stability in the lithium battery system.