Mechanochemical Synthesis of KxMn[Fe(CN)6] and CNT Composite for High-power Potassium-ion Batteries (Supporting Information)

This study introduces a facile mechanochemical synthesis of KxMn[Fe(CN)6] (KMnHCF) and carbon nanotube (CNT) composite (KMnHCF@CNT) as a positive electrode material for potassium-ion batteries. The KMnHCF@CNT, synthesized by a simultaneous process of mechanochemical synthesis and carbon compositing, shows a homogeneous composite and achieves a much higher electron conductivity of 7.16 × 10−1 S cm−1 than the KMnHCF and CNT mixture (2.35 × 10−2 S cm−1) synthesized by the two-step process. The improved electron conductivity demonstrates reduced carbon content in the electrode and excellent rate performance of maintaining 80 mAh g−1 at 20 C in potassium cells.

本研究提出了一种简便的机械化学合成方法，用于制备 KxMn[Fe(CN)6]（KMnHCF）及碳纳米管（CNT）复合物（KMnHCF@CNT），并将其作为钾离子电池的正极材料。通过机械化学合成与碳复合的同步工艺合成的 KMnHCF@CNT，呈现出均匀的复合材料结构，并实现了相较于 KMnHCF 与 CNT 混合物（电子电导率为 2.35 × 10−2 S cm−1）通过两步法合成的 7.16 × 10−1 S cm−1 的显著更高的电子电导率。这种电子电导率的提升表明电极中的碳含量降低，同时在钾离子电池中表现出卓越的速率性能，在 20 C 下保持 80 mAh g−1 的容量。