Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 46, Pages 43146-43155Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b14346
Keywords
hyperbranched star polymer; nanoconfinement; 3D rigid framework; all-solid-state polymer electrolyte; lithium-ion battery
Funding
- National Natural Science Foundation of China [51073170]
- NSFC-Key Project of Shanxi Coal Based Low Carbon Joint Foundation [U1610222]
- Innovation Program of CAS Combination of Molecular Science and Education
Ask authors/readers for more resources
The original poly(ethylene oxide)-based polymer electrolytes normally show low ionic conductivity and inferior mechanical property, which greatly restrict their practical application in all-solid-state lithium-ion batteries (LIBs). In this work, a hyperbranched star polymer with poly(ethylene glycol) methyl ether methacrylate flexible chain segments is embedded into a three-dimensional (3D) interpenetrating cross-linking network created by the rapid one-step UV-derived photopolymerization of the cross-linker (ethoxylated trimethylolpropane triacrylate) in the presence of lithium salt. The rigid 3D network framework provides the polymer electrolyte with not only enhanced mechanical behavior, including film-forming and dendrite-inhibiting capabilities, but also nanoconfinement effects, which can speed up polymer chain segmental dynamics and reduce the crystallinity of the polymer. Depending on this unique rigid flexible coupling network, the prepared solid polymer electrolyte shows enhanced ionic conductivity (6.8 x 10(-5) S cm(-1) at 50 degrees C), widened electrochemical stability window (5.1 V vs Li/Li+), and enough mechanical stability to suppress the growth of uneven Li dendrite (the Li symmetrical cells can operate steadily at both current densities of 0.05 and 0.1 mA cm(-2) for 1000 h). Moreover, the assembled LiFePO4//Li cell also exhibited good cycle performance at 50 degrees C, making the hyperbranched star polymer electrolyte with a nanoconfined cross-linking structure to have potential application in high-safety and high-performance LIBs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available