Towards high energy-high power dendrite-free lithium metal batteries: The novel hydrated vanadium oxide/graphene‖silicon nitride/lithium system

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.