The electrode/electrolyte interface of polyanionic Na-insertion compounds Na3V2(PO4)3 (NVP) and Na3V2(PO4)2F3 (NVPF) is investigated by the complementary use of electrochemical quartz crystal microbalance and operando infrared fiber evanescent wave spectroscopy combined with molecular dynamics simulations. An unusual mass uptake/depletion signal is...

Fundamental knowledge of the calendering process for large-scale electrode production is critically required to optimize electrochemical energy storage manufacturing. In this review the way forward to optimize porosity, adhesion, thickness, and wettability of electrodes by calendering is demonstrated, which is expected to lead to improved volumetric...

A high-performance and stable perovskite solar cell is demonstrated by using a fluorinated indoloindole (IDIDF)-based linear-type hole transporting material. The perovskite solar cell using IDIDF2 achieves high performance in non-doped (23.16%) and doped conditions (24.24%), respectively. In addition, the corresponding devices show superior device...

The SnSe2 single crystal consists of a large-period polytype with an 18R low-symmetry structure. This work in situ applies pressure to the specimen and observes pressure-derived dynamic phase transitions from 18R to 4H, and finally to 2H-SnSe2. This results in superior and near isotropic plasticity along the direction parallel and perpendicular to...

A novel and efficient strategy is developed for the annealing-free solution prepared SnO2 electron transport layer for perovskite solar cells (PSCs). Through simple electrochemical regulation low defect concentration and optimized band alignment is acheived for PSC devices. A device power conversion efficiency (PCE) champion of 24.7% is reported with...

Through large-scale experimental investigations, how temperature and (dis)charging-rate relate to key parameters in the C − N fatigue of LIBs is reported. It is demonstrated that LIBs’ cycle-life follows a lognormal distribution. With both advances, a probabilistic C − N model is derived to evaluate the fatigue failure probability in LIBs. Results...