Novel piperidinium-based ionic liquid as electrolyte additive for high voltage lithium-ion batteries.

Conventional carbonate-based electrolyte is prone to oxidative decomposition at high voltage (over 4.5 V Li/Li), which leads to the bad oxidation stability and inferior cycling performance of lithium ion batteries (LIBs). To solve these problems, a novel ionic liquid (IL) -butyronitrile--methylpiperidinium bis(fluorosulfonyl)imide (PPFSI) was synthesized and explored as the additive to the LiPF-ethylene carbonate (EC)/dimethyl carbonate (DMC) electrolyte.

Boosting Electrochemical Oxygen Reduction Performance of Iron Phthalocyanine through Axial Coordination Sphere Interaction.

Precise regulation of the electronic states of catalytic sites through molecular engineering is highly desired to boost catalytic performance. Herein, a facile strategy was developed to synthesize efficient oxygen reduction reaction (ORR) catalysts, based on mononuclear iron phthalocyanine supported on commercially available multi-walled carbon nanotubes that contain electron-donating functional groups (FePc/CNT-R, with "R" being -NH , -OH, or -COOH). These functional groups acted as axial ligands that coordinated to the Fe site, confirmed by X-ray photoelectron spectroscopy and synchrotron-radiation-based X-ray absorption fine structure.