Enhancement of thermal stability and cycling performance in lithium-ion cells through the use of ceramic-coated separators

Nano SiO2 particle formation and deposition on polypropylene separators for lithium-ion batteries

“…In addition, all the species have much smaller radius (Li + of 0.09-0.109 nm, PF 6 − of 0.16 nm, EC molecular of 0.25 nm, and DEC molecular of 0.30 nm) as compared to the pore size of the separator on a micron meter scale. This enhanced transport of species in the electrolyte suggests a reduction of ion/molecule transport impedance as reported by others [24,26]. This reduced impedance could then facilitate the kinetics of charge/discharge reactions, resulting in an improved rate performance particularly at higher rates.…”

“…This clearly shows a much improved rate capability of batteries using SiO 2 coated separators. An improved rate capability after Al 2 O 3 coating was reported by Choi et al [24]. The improved rate performance was ascribed to the favourable interfacial charge transport between the electrodes and the electrolytes in the cell, because the coating layer on both sides of the separator was able to assist in the adhering of separator to the electrodes after soaking in the electrolyte solution.…”

“…Another recent approach was the coating of polyolefin based separators using inorganic particles due to the excellent thermal stability and wettability of inorganic particles with organic electrolytes. This approach significantly improves the thermal shrinkage and electrochemical performance of the separators [19][20][21][22][23][24][25][26]. However, in these studies, commercially available inorganic powders (such as clay, SiO 2 , Al 2 O 3 , etc.)…”

Smart Electrochemical Energy Storage Devices with Self‐Protection and Self‐Adaptation Abilities

“…[67][68][69][70] Two types of techniques have been developed to address the thermal runaway problem. One method is to inhibit heat generation by adopting alternative electrolytes, e.g., polymer gel electrolytes and solid-state electrolytes with low ionic conductivities.…”

“…[71][72][73][74] The other route is to release or absorb the heat before overheating, e.g., employing safety vents, extinguishing agents, or a thermal fuse. [70,[75][76][77][78] Although these related studies showed some effects in thermal protection, they are limited by the passive strategies with significant sacrifices of energy storage performance and irreversible self-protection reactions.…”