Multiple conductive network for KTi2(PO4)3 anode based on MXene as a binder for high-performance potassium storage

KTi 2 (PO 4 ) 3 is a promising anode material for potassium storage, but suffers from low conductivity and difficult balance between high capacity and good structural stability. Herein, the Ti 3 C 2 T x MXene is used as a multifunctional binder to fabricate the KTi 2 (PO 4 ) 3 electrode by the traditional homogenizingcoating method. The MXene nanosheets, together with the conductive agent super P nanoparticles, construct a multiple conductive network for fast electron/ion transfer and high electrochemical kinetics. Moreover, the network ensures the structural stability of the KTi 2 (PO 4 ) 3 electrode during the deintercalation/intercalation of 4 K + ions, which is beneficial for simultaneously achieving high capacity and good cycle performance. Therefore, the MXene-bonded KTi 2 (PO 4 ) 3 electrode delivers a reversible capacity of 255.2 mAh/g at 50 mA/g, outstanding rate capability with 132.3 mAh/g at 2 A/g, and excellent cycle performance with 151.6 mAh/g at 1 A/g after 20 0 0 cycles. This work not only suggests a high-performance anode material for potassium -ion batteries, but also demonstrates that the MXene is a promising binder material for constructing conductive electrodes in rechargeable batteries. (c) 2024 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.