A scalable bio-inspired polydopamine-Cu ion interfacial layer for high-performance lithium metal anode

The growth of Li dendrites and the instability of the solid electrolyte in terphase(SEI)layer during plating/stripping has hin dered the practical applicati on of high-energy-density batteries based on a lithium metal anode.Building a stable interfacial layer is effective in preventing lithium corrosiion by the electrolyte and controlling the deposition of lithium metal.Here,we present a robust polydopamine-Cu ion(PDA-Cu^2+)coati ng layer formed by the aggregation of nanoparticles and Cu ions,which can be obtained by a subtle immersion strategy.We demonstrate that the PDA-Cu^2+ protective layer,with a unique structure comprising nanoparticles,can regulate and guide Li metal deposition,and together with Cu ions,forms a lubricating surface to facilitate uniform Li ion diffusion and induce stable SEI layer formation.Li anodes with this PDA-Cu^2+layer modification ultimately achieve higher Coulombic efficiencies,which are consistently stable for over 650 cycles at 0.5 mA·cm^-2 without Li dendrites.The introduced PDA-Cu^2+ coating can adhere to any material of any shape;addition ally,the operation can be realized on a large scale because of its simplicity.These merits provide a promising approach for developing stable and safe lithium metal batteries.

Multidimensional Co_(3)O_(4)/NiO heterojunctions with richboundaries incorporated into reduced graphene oxide network for expanding the range of lithiophilic host

The commercial application of lithium(Li)metal anode is hindered by the growth of Li dendrites.Here,we develop a multidimensional composite struc-ture composed of Co3O4/NiO heterojunction particles and reduced graphene oxide(rGO)nanosheets,that allows Li to nucleate and deposit selectively in one direction.Among,two transition metal oxides(TMOs)without lit-hiophilicity are transformed into lithiophilic species due to the rich phase boundaries and high Li adsorption energies on interfaces,which can provide uniform active sites and reduce nucleation overpotential for Li deposition.Meanwhile,the rGO substrate with high electrical conductivity and large spe-cific surface area can form a conductive network between TMOs and alleviate volume expansion caused by Li deposition.Benefitting from the synergistic effect of the heterojunctions and carbon substrate,the Co_(3)O_(4)/NiO-rGO regu-lates the local current density and enables the dendrite-free Li plating/stripping behavior.At a current density of 1 mA cm^(-2),the Li metal anode with the Co_(3)O_(4)/NiO-rGO host exhibits remarkable electrochemical performance,consistently maintaining high Coulombic efficiency(>93.8%)over 1000 cycles.Additionally,the full cells matched with LiFePO_(4)cathode also display high rate capability of 130 mAh g^(-1)at 1 C and stable cycling life over 500 cycles.