Abstract
KTi2(PO4)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 Ti3C2Tx MXene is used as a multifunctional binder to fabricate the KTi2(PO4)3 electrode by the traditional homogenizing-coating 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 kinet-ics.Moreover,the network ensures the structural stability of the KTi2(PO4)3 electrode during the de-intercalation/intercalation of 4 K+ions,which is beneficial for simultaneously achieving high capacity and good cycle performance.Therefore,the MXene-bonded KTi2(PO4)3 electrode delivers a reversible capacity of 255.2 mAh/g at 50mA/g,outstanding rate capability with 132.3 mAh/g at 2 A/g,and ex-cellent cycle performance with 151.6 mAh/g at 1 A/g after 2000 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.
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