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Identifying the intrinsic anti-site defect in manganese-rich NASICON-type cathodes

Manganese-rich NASICON-type materials have triggered widespread attention for developing advanced polyanionic cathodes, primarily driven by their abundant reserves and promising cycling performance with high operating voltages (~3.8 V for Mn2+/3+/4+, versus Na+/Na). However, the charge/discharge profiles exhibit significant voltage hysteresis, which leads to a limited reversible capacity, thereby preventing their application. Here, we demonstrate that the voltage hysteresis in manganese-rich NASICON-type cathodes (Na3MnTi(PO4)3) is closely related to the intrinsic anti-site defect (IASD), which forms during synthesis and is captured in our characterizations. Combining electrochemical analysis and spectroscopic techniques, we draw a comprehensive picture of sluggish Na+ diffusion behaviours in the IASD-affected structure during cycling, and rationalize the relationship of voltage hysteresis, phase separation and delayed charge compensation. Furthermore, a Mo-doping strategy is dev ....

Nano Lett , Energy Lett , Energy Mater , Nano Energy , Energy Environ , Power Sources ,

The importance of understanding the input parameters of PAN files

With numerous markets reporting problems with overly optimistic P50 estimates, attention has also been drawn to similar issues with PAN files. TÜV Rheinland’s Yating Zhang and Christos Monokroussos discuss the subject at length. ....

United States , Eleanorw Lee , V Rheinland Yating Zhang , European Photovoltaic Solar Energy Conference , Energy Mater , Yating Zhang , Christos Monokroussos , Power Gener , Specialists Conference , Silver Springs , Light Induced Degradation , Induced Degradation , Rear Passivated , Physics Letters ,