High energy-high power dendrite-free Lithium (Li) metal full batteries is successfully proposed. V3O7·H2O nanoribbons/graphene hybrids cathode is fabricated via a facile one-step hydrothermal synthetic strategy. Si3N4 submicron-wire membrane, fabricated by a modified catalyst-assisted pyrolysis of polyurea silazane method, is proposed to reduce the local flux of Li+ moving toward the anode and effectively extend the physical path of dendrite growth, so as to achieve the non-dendritic Li growth. The morphologies of the repeated Li deposition/stripping onto Li metal anode with Si3N4 membrane display a dendrite-free morphology. Our experimental and simulation results show the resulting V3O7·H2O/graphene‖Si3N4/Li cell delivers a high energy density of 810.8 Wh kg−1 at a power density of 86.2 W kg−1, and still retains 383.4 Wh kg−1 even at a high power density of 10648.9 W kg−1, which holds a great potential in new energy field, such as electric vehicles and even to megawatt-scale energy storage systems.