Lithium metal is one of the most promising anode materials for rechargeable battery with high energy density,but its practical use is still hindered by two main problems,namely,lithium dendrite growth and low Coulombi...Lithium metal is one of the most promising anode materials for rechargeable battery with high energy density,but its practical use is still hindered by two main problems,namely,lithium dendrite growth and low Coulombic efficiency.To address the issues,cesium nitrate(CsNO3)is selected as the additive to modify the electrolyte for lithium secondary battery.Here we report electrochemical performance of lithium secondary battery with different concentration of CsNO3 as electrolyte additive.The study result demonstrates that Coulombic efficiency of Li–Cu cells and the lifetime of symmetric lithium cells contained CsNO3 additive are improved greatly.Li–Cu cell with 0.05 mol/L CsNO3 and 0.15 mol/L LiNO3 as electrolyte additive presents the best electrochemical performance,having the highest Coulombic efficiency of around 97%and the lowest interfacial resistance.With increasing the concentration of CsNO3 as electrolyte additive,the electrochemical performance of cells becomes poor.Meanwhile,the morphology of lithium deposited films with CsNO3-modified electrolyte become smoother and more uniform compared with the basic electrolyte.展开更多
Aqueous zinc metal batteries(AZMBs)have garnered widespread attention due to their low cost and high safety.However,current researches are still primarily focused on reversible cycling at low areal capacity,which is f...Aqueous zinc metal batteries(AZMBs)have garnered widespread attention due to their low cost and high safety.However,current researches are still primarily focused on reversible cycling at low areal capacity,which is far from practical application.Addressing interfacial stability issues encountered during cycling and employing interfacial optimization strategies can promote the development of safe and eco-friendly AZMBs.By introducingγ-valerolactone(GVL),which disrupts the original hydrogen bonding network of water,the electrochemical window of electrolyte is expanded,and the reactivity of water is significantly reduced.Additionally,the incorporation of GVL in Zn ion solvation alters the deposition pattern on the Zn anode surface,resulting in improved cyclic performance.The cells demonstrated excellent performance,maintaining stable over 400 h at 5 mA/cm^(2)-5 mA·h/cm^(2),and nearly 300 h in Zn||Zn symmetric cell at 80%depth of discharge(DOD).The full cells matched with NH_(4)V_(4)O_(10) could cycle over 200 cycles under the condition of high areal capacity(7 mA·h/cm^(2)),an N/P ratio of 1.99 and an E/C ratio of 9.3μL/(mA·h).展开更多
基金Project(2016YFB0300801)supported by the National Key Research and Development Program of ChinaProject(2012CB619502)supported by the National Basic Research Program of China
文摘Lithium metal is one of the most promising anode materials for rechargeable battery with high energy density,but its practical use is still hindered by two main problems,namely,lithium dendrite growth and low Coulombic efficiency.To address the issues,cesium nitrate(CsNO3)is selected as the additive to modify the electrolyte for lithium secondary battery.Here we report electrochemical performance of lithium secondary battery with different concentration of CsNO3 as electrolyte additive.The study result demonstrates that Coulombic efficiency of Li–Cu cells and the lifetime of symmetric lithium cells contained CsNO3 additive are improved greatly.Li–Cu cell with 0.05 mol/L CsNO3 and 0.15 mol/L LiNO3 as electrolyte additive presents the best electrochemical performance,having the highest Coulombic efficiency of around 97%and the lowest interfacial resistance.With increasing the concentration of CsNO3 as electrolyte additive,the electrochemical performance of cells becomes poor.Meanwhile,the morphology of lithium deposited films with CsNO3-modified electrolyte become smoother and more uniform compared with the basic electrolyte.
基金Project(2023YFC2908305)supported by the National Key R&D Program of ChinaProjects(52072411,52301273)supported by the National Natural Science Foundation of China+1 种基金Project(2023CXQD038)supported by the Central South University Innovation-Driven Research Program,ChinaProject(S202310533413)supported by the Fundamental Research Funds for the Central Universities of Central South University,China。
文摘Aqueous zinc metal batteries(AZMBs)have garnered widespread attention due to their low cost and high safety.However,current researches are still primarily focused on reversible cycling at low areal capacity,which is far from practical application.Addressing interfacial stability issues encountered during cycling and employing interfacial optimization strategies can promote the development of safe and eco-friendly AZMBs.By introducingγ-valerolactone(GVL),which disrupts the original hydrogen bonding network of water,the electrochemical window of electrolyte is expanded,and the reactivity of water is significantly reduced.Additionally,the incorporation of GVL in Zn ion solvation alters the deposition pattern on the Zn anode surface,resulting in improved cyclic performance.The cells demonstrated excellent performance,maintaining stable over 400 h at 5 mA/cm^(2)-5 mA·h/cm^(2),and nearly 300 h in Zn||Zn symmetric cell at 80%depth of discharge(DOD).The full cells matched with NH_(4)V_(4)O_(10) could cycle over 200 cycles under the condition of high areal capacity(7 mA·h/cm^(2)),an N/P ratio of 1.99 and an E/C ratio of 9.3μL/(mA·h).
