Turning over a new leaf: Guest Editors Alexandru Vlad, Jun Chen, and Yan Yao present their perspectives on the role of organic materials in the development of sustainable energy storage technologies and introduce this Special Collection th...
Toward Highly Reliable Potassium‐Ion Half and Full Coin Cells
Von Wiley-VCH zur Verfügung gestellt
Assembling potassium-ion full-cells is mandatory to evaluate energy/power densities but it remains challenging. This study investigates parameters governing half- and full-cells performance using KVPO4F0.5O0.5 and graphite electrodes. Optimal parameters are determined including electrolyte volume, N/P diameter and capacity ratios. Overall, highly reliable full-cells of 47 Wh kgdevice −1 were obtained.
To develop high energy and high-power potassium-ion batteries (KIBs), performance need to be evaluated in full-cells instead of half-cells based on the highly reactive K metal that leads to misinterpretation of the results. However, assembling KIBs full-cells is not trivial as many parameters are critical to the obtained performance. This work demonstrates approaches to assemble reliable K-ion full-cells using graphite and KVPO4F0.5O0.5 based electrodes. First, the optimal separators choice/number and electrolyte choice/volume are determined in half-cells then the optimal electrolyte volume is determined in full-cells. Importantly, the electrolyte volume should be fixed to about 4 times the porosity volume for both half- and full-cells. Then, using 3-electrodes cells, the optimal negative/positive (N/P) diameter ratio then the optimal N/P capacity ratio are determined to be 1.16±0.2. Finally, these approaches allow assembling KVPFO//graphite coin-cells with an energy density of about 47 Wh kgdevice −1 using a high N/P loading ratio of 4/10 (in mgactive-material cm−2). Overall, this work can be used as a guide to assemble any KIBs full-cell system and thus paves the way to the determine the best negative/positive materials combination in order to develop efficient KIBs.Zum Volltext
Jetzt nächsten Artikel lesen:
Überprüfung Ihres Anmeldestatus ...
Wenn Sie ein registrierter Benutzer sind, zeigen wir in Kürze den vollständigen Artikel.