The K metal batteries are emerged as promising alternatives beyond commercialized Li-ion batteries.However,suppressing uncontrolled dendrite is crucial to the accomplishment of K metal batteries.Herein,an oxygen-rich treated carbon doth(TCC)has been designed as the K plating host to guide K homogeneous nucleation and suppress the dendrite growth.Both density function theory calculations and experimental results demonstrate that abundant oxygen functional groups as K-philic sites on TCC can guide K nucleation and deposition homogeneously.As a result,the TCC electrode exhibits an ultra-long-life over 800 cycles at high current density of 3.0 mA?cm-2 for 3.0 mA?h?cm-2.Furthermore,the symmetrical cells can run stably for 2,000 h with low over-potential less than 20 mV at 1.0 mA?cm-2 for 1.0 mA?h?cm-2.Even at a higher current of 5.0 mA?cm-2,the TCC electrode can still stably cyde for 1,400 h.