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 graphen...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.展开更多
基金Beijing Outstanding Young Scientists Program,Grant/Award Number:BJJWZYJH01201910007023Guangdong Key Laboratory of Battery Safety,Grant/Award Number:2019B121203008+1 种基金National Natural Science Foundation of China,Grant/Award Numbers:51972030,51772030,52002022S&T Major Project of Inner Mongolia Autonomous Region of China,Grant/Award Number:2020ZD0018。
文摘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.
