Carboni Marco, Naylor Andrew J, Valvo Mario, Younesi Reza
Department of Chemistry - Ångström Laboratory, Uppsala University Box 538, SE-75121 Uppsala Sweden
RSC Adv. 2019 Jul 5;9(36):21070-21074. doi: 10.1039/c9ra01931f. eCollection 2019 Jul 1.
Graphite is considered a promising candidate as the anode for potassium-ion batteries (KIBs). Here, we demonstrate a significant improvement in performance through the ball-milling of graphite. Electrochemical techniques show reversible K-intercalation into graphitic layers, with 65% capacity retention after 100 cycles from initial capacities and extended cycling beyond 200 cycles. Such an affinity of the graphite towards storage of K-ions is explained by means of SEM and Raman analyses. Graphite ball-milling results in a gentle mechanical exfoliation of the graphene layers and simultaneous defect formation, leading to enhanced electrochemical performance.
石墨被认为是钾离子电池（KIBs）阳极的一个有前景的候选材料。在此，我们展示了通过对石墨进行球磨，其性能有显著提升。电化学技术表明钾可可逆地嵌入石墨层，从初始容量开始，经过100次循环后容量保持率为65%，并且可延长循环至200次以上。通过扫描电子显微镜（SEM）和拉曼分析对石墨对钾离子存储的这种亲和力进行了解释。石墨球磨导致石墨烯层发生轻度机械剥离并同时形成缺陷，从而提高了电化学性能。
