Ti-substituted O3-type layered oxide cathode material with high-voltage stability for sodium-ion batteries.

O3-type layered transition metal oxides (NaTMO) have attracted extensive attention as a promising cathode material for sodium-ion batteries because of their high capacity. However, the irreversible phase transition especially cycled under high voltage remains a concerning challenge for NaTMO. Herein, a Ti-substituted NaNiCoMnO cathode with strongly suppressed phase transition and enhanced storage stability is investigated.

[Comparison of two screening scales used by 120 dispatchers for early identification of pre-hospital stroke patients and telephone guidance for treatment].

Objective: To observe the effect of two different screening scales used by 120 dispatchers to early identify stroke patients and give telephone guidance for treatment.

Methods: From October 2018 to August 2019, 2 027 stroke and suspect stroke patients who called the Kaifeng 120 Emergency Center were enrolled. The differences in the final positive rate of stroke diagnosis and the incidence of adverse events were compared and analyzed in 1 020 cases using recognition of stroke in the emergency room (ROSIER) and 1 007 cases using facial drooping, arm weakness, speech difficulties and time (FAST) scale scores for telephone guidance.

The Effects of Reversibility of H2-H3 Phase Transition on Ni-Rich Layered Oxide Cathode for High-Energy Lithium-Ion Batteries.

Although LiNiCoMnO is attracting increasing attention on account of its high specific capacity, the moderate cycle lifetime still hinders its large-scale commercialization applications. Herein, the Ti-doped LiNiCoMnO compounds are successfully synthesized. The Li(NiCoMn)TiO sample exhibits the best electrochemical performance.

Porous Hollow Superlattice NiMnO/NiCoO Mesocrystals as a Highly Reversible Anode Material for Lithium-Ion Batteries.

As a promising high-capacity anode material for Li-ion batteries, NiMnO always suffers from the poor intrinsic conductivity and the architectural collapse originating from the volume expansion during cycle. Herein, a combined structure and architecture modulation is proposed to tackle concurrently the two handicaps, via a facile and well-controlled solvothermal approach to synthesize NiMnO/NiCoO mesocrystals with superlattice structure and hollow multi-porous architecture. It is demonstrated that the obtained NiCoMnO sample is made up of a new mixed-phase NiMnO/NiCoO compound system, with a high charge capacity of 532.