Lithium Hexamethyldisilazide Endows Li||NCM811 Battery with Superior Performance

Abstract

The construction of stable cathode electrolyte interphase (CEI) is the key to improve the NCM811 particle structure and interfacial stability via electrolyte engineering. In He’s work, lithium hexamethyldisilazide (LiHMDS) as the electrolyte additive is proposed to facilitate the generation of stable CEI on NCM811 cathode surface and eliminate H2O and HF in the electrolyte at the same time, which boosts the cycling performance of Li||NCM811 battery up to 1000 or 500 cycles with 4.5 V cut-off voltage at 25 or 60 °C.

A bio-inspired electrolyte with in situ repair of Zn surface cracks and regulation of Zn ion solvation chemistry to enable long life and deep-cycling zinc metal batteries

“…6b, indicating the negligible effect of the TEOS additive in the electrochemical redox reaction of Zn/ V 2 O 5 battery. [47][48][49][50] Obviously, the Zn/V 2 O 5 cell using DE displayed a narrower voltage gap between the redox peaks with higher peak currents, suggesting better redox reversibility and higher electrochemical activity with the presence of TEOS. Consequently, the Zn/V 2 O 5 cell with DE exhibits much better rate capability than the counterpart in BE at all the current densities ranging from 0.2 A g −1 to 5 A g −1 , and back to 0.2 A g −1 .…”

Recent progress and strategic perspectives of inorganic solid electrolytes: fundamentals, modifications, and applications in sodium metal batteries

“…Although the bilayer or sandwich structures of polymers and inorganic SEs have demonstrated a much more stable interface during cycling, the additional interfaces between these layered structures can impede the fast ion diffusion and increase the total resistance of the SEs. By adding inorganic fillers in the polymer matrix, composite SEs should exhibit merits from both highly conductive ISEs and interfacial compatible polymer SEs, 796–800 which deserve future in-depth research for all-solid-state SMBs.…”

Molecular dipole engineering-assisted strain release for mechanically robust flexible perovskite solar cells

“…Due to the higher maximum electrostatic potential (f max ) of additives, they could increase the binding strength between the perovskite and the passivator and that due to the lower minimum electrostatic potential (f min ) of additives they could increase the binding strength between the carrier transport layers and the passivated perovskite layers, thus, additives with higher molecular polarity can build a stronger interaction with perovskite, resulting in less defects in the corresponding devices. [21][22][23] Tan et al inserted a passivating dipole layer at the interface between the perovskite and the electron transport layer to match energy and promote charge extraction. Three passivating dipole molecules of phenethylammonium (PEA), 4-fluorophenethylammonium (F-PEA) and (4-(trifluoromethyl) phenethylammonium (CF3-PEA) were employed.…”