Lithium-oxygen(Li-O_(2))batteries have been regarded as an expectant successor for next-generation energy storage systems owing to their ultra-high theoretical energy density.However,the comprehensive properties of th...Lithium-oxygen(Li-O_(2))batteries have been regarded as an expectant successor for next-generation energy storage systems owing to their ultra-high theoretical energy density.However,the comprehensive properties of the commonly utilized organic salt electrolyte are still unsatisfactory,not to mention their expensive prices,which seriously hinders the practical production and application of Li-O_(2) batteries.Herein,we have proposed a low-cost all-inorganic nitrate electrolyte(LiNO_(3)-KNO_(3)-DMSO)for Li-O_(2) batteries.The inorganic nitrate electrolyte exhibits higher ionic conductivity and a wider electrochemical stability window than the organic salt electrolyte.The existence of K+can stabilize the O_(2)-intermediate,promoting the discharge process through the solution pathway with an enlarged capacity.Even at an ultra-low concentration of 0.01 M,the K+can still remain stable to promote the solution discharge process and also possess a new function of inhibiting the dendrite growth by electrostatic shielding,further enhancing the battery stability and contributing to the long cycle lifetime.As a result,in the 0.99 M LiNO_(3)-0.01 M KNO_(3)-DMSO electrolyte,the Li-O_(2) batteries exhibit prolonged cycling performance(108 cycles)and excellent rate performance(2 A·g^(-1)),significantly superior to the organic salt one.展开更多
Viscosities were measured for the ternary systems Y（NO3）3＋La（NO3）3＋H2O, La（NO3）3＋Ce（NO3）3＋H2O, and La（NO3）3＋Nd（NO3）3＋ H2O and their binary subsystems Y（NO3）3＋H2O, La（NO3）3＋H2O, Ce（NO3）3＋H2O,...Viscosities were measured for the ternary systems Y（NO3）3＋La（NO3）3＋H2O, La（NO3）3＋Ce（NO3）3＋H2O, and La（NO3）3＋Nd（NO3）3＋ H2O and their binary subsystems Y（NO3）3＋H2O, La（NO3）3＋H2O, Ce（NO3）3＋H2O, and Nd（NO3）3＋H2O at 293.15, 298.15 and 308.15 K. The results were used to test the applicability of simple equations for the viscosity of the mixed solutions. The predictions agreed well with measured values, implying that the viscosities of the examined electrolyte solutions could be related to those of their constituent binary solutions using these simple equations.展开更多
基金financially supported by the National Key R&D Program of China(No.2020YFE0204500)the National Natural Science Foundation of China(Nos.52171194,52271140)+2 种基金the CAS Project for Young Scientists in Basic Research(No.YSBR-058)the Youth Innovation Promotion Association CAS(No.2020230)the National Natural Science Foundation of China Outstanding Youth Science Foundation of China(Overseas).
文摘Lithium-oxygen(Li-O_(2))batteries have been regarded as an expectant successor for next-generation energy storage systems owing to their ultra-high theoretical energy density.However,the comprehensive properties of the commonly utilized organic salt electrolyte are still unsatisfactory,not to mention their expensive prices,which seriously hinders the practical production and application of Li-O_(2) batteries.Herein,we have proposed a low-cost all-inorganic nitrate electrolyte(LiNO_(3)-KNO_(3)-DMSO)for Li-O_(2) batteries.The inorganic nitrate electrolyte exhibits higher ionic conductivity and a wider electrochemical stability window than the organic salt electrolyte.The existence of K+can stabilize the O_(2)-intermediate,promoting the discharge process through the solution pathway with an enlarged capacity.Even at an ultra-low concentration of 0.01 M,the K+can still remain stable to promote the solution discharge process and also possess a new function of inhibiting the dendrite growth by electrostatic shielding,further enhancing the battery stability and contributing to the long cycle lifetime.As a result,in the 0.99 M LiNO_(3)-0.01 M KNO_(3)-DMSO electrolyte,the Li-O_(2) batteries exhibit prolonged cycling performance(108 cycles)and excellent rate performance(2 A·g^(-1)),significantly superior to the organic salt one.
基金Project supported by the National Natural Science Foundation of China (20976189, 21076224 and 21036008)the Science Foundation of China University of Petroleum (qzdx-2011-01) for financial sup-port
文摘Viscosities were measured for the ternary systems Y（NO3）3＋La（NO3）3＋H2O, La（NO3）3＋Ce（NO3）3＋H2O, and La（NO3）3＋Nd（NO3）3＋ H2O and their binary subsystems Y（NO3）3＋H2O, La（NO3）3＋H2O, Ce（NO3）3＋H2O, and Nd（NO3）3＋H2O at 293.15, 298.15 and 308.15 K. The results were used to test the applicability of simple equations for the viscosity of the mixed solutions. The predictions agreed well with measured values, implying that the viscosities of the examined electrolyte solutions could be related to those of their constituent binary solutions using these simple equations.
