.png){kind=icon}
Return
Functional Composite Separators with Cation-Trapping Abilities
.png){kind=icon}
PRE
AI
DOI：10.1021/acsaem.4c00094.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Separators in Li-ion batteries are crucial components that have a great impact on battery safety and lifespan. The design of multifunctional separators is desired to tackle problems, such as thermal runaway or electrode degradation. However, addressing both of these challenges is hardly achievable. Here, we propose a versatile process to form hybrid separators with a tunable architecture and surface chemistry. Combining electrospinning with sol-gel chemistry, homogeneous nanofibers made of poly(vinylidene fluoride-co-hexafluoropropylene) and up to 37 wt % of silica were obtained, showing high mechanical properties and outstanding thermal stability. Multilayer separators were designed to achieve shutdown properties: outer layers of hybrid fibers maintained the dimensional stability of the separator, while an inner layer of polymer fibers melted to raise the ionic resistance. Notably, in the battery cell configuration, we demonstrate the advantages of incorporating hybrid fibers, which help maintain the dimensional stability of the separator. The hybrid nanofibers were also functionalized with amine or lithium sulfonate groups to trap hydrofluoric acid (HF) or metallic cations. XPS analyses revealed the protonation of amine functions on separator fibers after cycling in LiNiO2||graphite coin cells, which evidenced the scavenging of acidic species such as HF. In addition, we observed a correlation between the amount of Ni cations deposited on the graphite after cycling and the capacity loss attributed to the graphite electrode. The functional separator incorporating terpyridine molecules allowed for a reduced nickel crossover from LiNiO2 to graphite and better capacity retention compared with the other separators.
Keywords:
Li-ion batteries
functionalseparators
nanofibers
thermal runaway
cation crossover
sol-gel
LiNiO2
Journal
IF:
5.5
Papers:
1.1W
Citations:
4.5W
Organization
Cited Papers
First-Principles Modeling of Mn(II) Migration above and Dissolution from LixMn2O4 (001) Surfaces
OAAI
OAAIShareSaveThree-in-one strategy: Heat regulation and conversion enhancement of a multifunctional separator for safer lithium-sulfur batteries.png)
CARBON ENERGY
OAAI
CARBON ENERGYIF24.2
OAAIShareSaveBinder-Free, Thin-Film Ceramic-Coated Separators for Improved Safety of Lithium-Ion BatteriesACS OMEGAOAAI
ACS OMEGAIF4.3
OAAIShareSaveShareSaveShareSaveShareSave
View more