4 V-operated all solid symmetrical supercapacitors that employ mixtures of various weight compositions with c-P4VPh and EMITFSI electrolytes have been demonstrated and characterized.
Nanoporous anodic aluminium oxide (AAO) enables the direct utilization of lithium metal as an ideal anode, owing to a uniform current distribution. The electrochemical performance of the AAO separator is superior to commercial polypropylene, in terms of ionic conductivity, discharge capacity, and capacity fading.
A bimodal redox-active ionic liquid electrolyte for high energy density supercapacitors was fabricated by the redox reaction of halide ions and size variation of ions.
We introduce a novel self-reducible Cu ion complex ink, composed of formate, alkanolamine groups and poly alcohols, for the air sinterable, low-cost, environment-friendly fabrication of Cu conductive electrodes.
Understanding the capacity fading mechanism of the LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode materials is crucial for achieving long-lasting lithium-ion batteries with high energy densities. In this study, we investigated the factors affecting the capacity fading of NCM811 during repeated cycling at high temperatures. We found that the change in the c-axis length during charging and discharging is the main cause of the formation and propagation of microcracks in the primary particles of NCM811. In addition, the electrolyte is decomposed on the microcrack surfaces and, consequently, by-products are formed on the particle surface, increasing the impedance and resulting in poor electronic and ionic connectivity between the primary particles of NCM811. In addition, the transition metals in the NCM811 cathode material are dissolved in the electrolyte from the newly formed microcrack surface between primary particles. Therefore, the electrolyte decomposition and transition metal dissolution on the newly formed surface are the major deteriorative effects behind the capacity fading in NCM811.
Summary
The suggested surface treatment using ammonium persulfate (APS) successfully introduces hydrophilic functional groups onto the microporous structure of the polyethylene (PE) separators, leading to a high affinity toward polar liquid electrolytes without degrading the intrinsic physical properties of the separator. This improves the lithium‐ion migration and ionic conductivity of the APS‐treated separator, affording a stable cycle performance (92.5% at 90th cycle) and significantly improved rate capability (87.5% at 3 C).
An effective and facile strategy is proposed to demonstrate an engineered oxide hetero-interface of a thin film diode with a high current density and low operating voltage. The electrical characteristics of an oxide hetero-interface thin film diode are governed by two theoretical models: the space charge-limited current model and the Fowler-Nordheim (F-N) tunneling model. Interestingly, the dominant mechanism strongly depends on the insulator thickness, and the mechanism change occurs at a critical thickness. This paper shows that conduction mechanisms of oxide hetero-interface thin film diodes depend on thicknesses of transport oxide layers and that current densities of these can be exponentially increased through quantum tunneling in the diodes with the thicknesses less than 10 nm. These oxide hetero-interface diodes have great potential for low-powered transparent nanoscale applications.
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