@article{nokey,

title = {P1−Ta8+N13 (x=0.1\textendash0.15): A Phosphorus Tantalum Nitride Featuring Mixed-Valent Tantalum and P/Ta Disorder Visualized by Scanning Transmission Electron Microscopy},

author = {M M Pointner and C Ceniza and L Nusser and K Witthaut and F Wolf and M Weidemann and L Eisenburger and A Moewes and O Oeckler and W Schnick},

url = {https://doi.org/10.1002/anie.202411441},

doi = {https://doi.org/10.1002/anie.202411441},

issn = {1433-7851},

year  = {2024},

date = {2024-11-04},

journal = {Angewandte Chemie International Edition},

volume = {63},

number = {45},

pages = {e202411441},

abstract = {Abstract We report on the synthesis, crystal, and electronic structure, as well as the magnetic, and electric properties of the phosphorus-containing tantalum nitride P1?xTa8+xN13 (x=0.1?0.15). A high-pressure high-temperature reaction (8?GPa, 1400?°C) of Ta3N5 and P3N5 with NH4F as a mineralizing agent yields the compound in the form of black, rod-shaped crystals. Single-crystal X-ray structure elucidation (space group C2/m (no. 12)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Contrasting Ultra-Low Frequency Raman and Infrared Modes in Emerging Metal Halides for Photovoltaics},

author = {V J Y Lim and M Righetto and S Yan and J B Patel and T Siday and B Putland and K M Mccall and M T Sirtl and Y Kominko and J Peng and Q Lin and T Bein and M Kovalenko and H J Snaith and M B Johnston and L M Herz},

url = {https://doi.org/10.1021/acsenergylett.4c01473},

doi = {10.1021/acsenergylett.4c01473},

year  = {2024},

date = {2024-07-29},

journal = {ACS Energy Letters},

volume = {9},

number = {8},

pages = {4127-4135},

abstract = {Lattice dynamics are critical to photovoltaic material performance, governing dynamic disorder, hot-carrier cooling, charge-carrier recombination, and transport. Soft metal-halide perovskites exhibit particularly intriguing dynamics, with Raman spectra exhibiting an unusually broad low-frequency response whose origin is still much debated. Here, we utilize ultra-low frequency Raman and infrared terahertz time-domain spectroscopies to provide a systematic examination of the vibrational response for a wide range of metal-halide semiconductors: FAPbI3, MAPbIxBr3\textendashx, CsPbBr3, PbI2, Cs2AgBiBr6, Cu2AgBiI6, and AgI. We rule out extrinsic defects, octahedral tilting, cation lone pairs, and “liquid-like” Boson peaks as causes of the debated central Raman peak. Instead, we propose that the central Raman response results from an interplay of the significant broadening of Raman-active, low-energy phonon modes that are strongly amplified by a population component from Bose\textendashEinstein statistics toward low frequency. These findings elucidate the complexities of light interactions with low-energy lattice vibrations in soft metal-halide semiconductors emerging for photovoltaic applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Smart Electrolytes for Lithium Batteries with Reversible Thermal Protection at High Temperatures},

author = {Q Yu and W Sun and S Wang and Q Qiu and W Zhang and H Tian and L Xia and P M\"{u}ller-Buschbaum},

url = {https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/batt.202400339},

doi = {https://doi.org/10.1002/batt.202400339},

year  = {2024},

date = {2024-06-19},

journal = {Batteries \& Supercaps},

volume = {n/a},

number = {n/a},

pages = {e202400339},

abstract = {Abstract Battery safety is a multifaceted concern, with thermal runaway standing out as a primary issue. In this work, we introduce a novel temperature-responsive, self-protection electrolyte governed by the phase separation dynamics of poly (butyl methacrylate) (PBMA) in lithium salt/tetraglyme (G4) blends. This innovation effectively mitigates the risks associated with thermal runaway in lithium batteries. Our electrolyte exhibits a temperature-responsive-recovery characteristic, imparting intelligent capabilities to lithium batteries. At temperatures of \>105 °C, the electrolyte transitions from a homogeneous phase to a segregated state, comprising a PBMA-rich phase with low conductivity and a high conductivity phase containing dissolved lithium salt in G4. The deposition of the PBMA-rich phase on the electrode surface obstructs the ion transport, thereby averting a thermal runaway. Subsequently, upon returning to room temperature of 25 °C, the electrolyte reverts to its homogeneous, highly conductive state, with battery capacity resuming at approximately 94 %. Thus, our electrolyte offers a robust, reversible, smart self-protection for batteries. Additionally, it demonstrates exceptional cycling performance at room temperature. Our findings open new avenues for thermo-reversible and self-protective electrolytes, advancing the safe and widespread adoption of lithium-ion batteries.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}