Li-rich layered oxide(LRLO)cathodes have been regarded as promising candidates for next-generation Li-ion batteries due to their exceptionally high energy density,which combines cationic and anionic redox activities.H...Li-rich layered oxide(LRLO)cathodes have been regarded as promising candidates for next-generation Li-ion batteries due to their exceptionally high energy density,which combines cationic and anionic redox activities.However,continuous voltage decay during cycling remains the primary obstacle for practical applications,which has yet to be fundamentally addressed.It is widely acknowledged that voltage decay originates from the irreversible migration of transition metal ions,which usually further exacerbates structural evolution and aggravates the irreversible oxygen redox reactions.Recently,constructing O2-type structure has been considered one of the most promising approaches for inhibiting voltage decay.In this review,the relationship between voltage decay and structural evolution is systematically elucidated.Strategies to suppress voltage decay are systematically summarized.Additionally,the design of O2-type structure and the corresponding mechanism of suppressing voltage decay are comprehensively discussed.Unfortunately,the reported O2-type LRLO cathodes still exhibit partially disordered structure with extended cycles.Herein,the factors that may cause the irreversible transition metal migrations in O2-type LRLO materials are also explored,while the perspectives and challenges for designing high-performance O2-type LRLO cathodes without voltage decay are proposed.展开更多
The uncontrollable growth of Zn dendrites accompanied by side reactions severely impedes the industrialized process of zinc ion electrochemical energy storage devices.Herein,we propose a practical metalorganic complex...The uncontrollable growth of Zn dendrites accompanied by side reactions severely impedes the industrialized process of zinc ion electrochemical energy storage devices.Herein,we propose a practical metalorganic complex interface layer to manipulate the zinc ion flux and electric field intensity,enabling highly homogeneous zinc electrodeposition.The zinc-terephthalic acid complex(ZnPTA)with lower adsorption energy for zinc ion(-1.3 eV)builds a zincophilic interface favoring the ordered nucleation and growth of Zn.Moreover,the ZnPTA layer can serve as physical barrier to protect the newly deposited Zn from corrosion in the aqueous electrolyte.The modified Zn anode with the ZnPTA layer(ZnPTA@Zn)demonstrates excellent cycling stability more than 3000 h at 1 mA/cm^(2).Besides,the zinc-ion battery and zinc-ion hybrid capacitor using the ZnPTA@Zn electrode deliver outstanding cycle performance(up to 5500 cycles with high residual capacity ratio of 77.9%).This work provides a promising metal-organic complex interface design on enhancing the performance of Zn metal anode.展开更多
基金funded by the National Natural Science Foundation of China(Grant Nos.22279092 and 5202780089).
文摘Li-rich layered oxide(LRLO)cathodes have been regarded as promising candidates for next-generation Li-ion batteries due to their exceptionally high energy density,which combines cationic and anionic redox activities.However,continuous voltage decay during cycling remains the primary obstacle for practical applications,which has yet to be fundamentally addressed.It is widely acknowledged that voltage decay originates from the irreversible migration of transition metal ions,which usually further exacerbates structural evolution and aggravates the irreversible oxygen redox reactions.Recently,constructing O2-type structure has been considered one of the most promising approaches for inhibiting voltage decay.In this review,the relationship between voltage decay and structural evolution is systematically elucidated.Strategies to suppress voltage decay are systematically summarized.Additionally,the design of O2-type structure and the corresponding mechanism of suppressing voltage decay are comprehensively discussed.Unfortunately,the reported O2-type LRLO cathodes still exhibit partially disordered structure with extended cycles.Herein,the factors that may cause the irreversible transition metal migrations in O2-type LRLO materials are also explored,while the perspectives and challenges for designing high-performance O2-type LRLO cathodes without voltage decay are proposed.
基金supported by the Fundamental Research Funds for the Central Universities,China。
文摘The uncontrollable growth of Zn dendrites accompanied by side reactions severely impedes the industrialized process of zinc ion electrochemical energy storage devices.Herein,we propose a practical metalorganic complex interface layer to manipulate the zinc ion flux and electric field intensity,enabling highly homogeneous zinc electrodeposition.The zinc-terephthalic acid complex(ZnPTA)with lower adsorption energy for zinc ion(-1.3 eV)builds a zincophilic interface favoring the ordered nucleation and growth of Zn.Moreover,the ZnPTA layer can serve as physical barrier to protect the newly deposited Zn from corrosion in the aqueous electrolyte.The modified Zn anode with the ZnPTA layer(ZnPTA@Zn)demonstrates excellent cycling stability more than 3000 h at 1 mA/cm^(2).Besides,the zinc-ion battery and zinc-ion hybrid capacitor using the ZnPTA@Zn electrode deliver outstanding cycle performance(up to 5500 cycles with high residual capacity ratio of 77.9%).This work provides a promising metal-organic complex interface design on enhancing the performance of Zn metal anode.
