The poor compatibility of ester electrolytes with lithium metal anode severely limits its use in high voltage lithium metal batteries(LMBs).In this work,a bidentate solvent 1,2-diethoxyethane(DEE) is introduced into e...The poor compatibility of ester electrolytes with lithium metal anode severely limits its use in high voltage lithium metal batteries(LMBs).In this work,a bidentate solvent 1,2-diethoxyethane(DEE) is introduced into ester electrolyte to regulate the ion-dipole interactions to enhance the solubility of LiNO_(3),which enables compatibility with Li anode and maintains the high voltage cathode stability.In the designed electrolyte,the steric effect of DEE facilitates the participation of NO_(3)^(-)and PF_6^(-)anions in the Li^(+) solvation structure,thus promoting the generation of inorganic-rich solid electrolyte interphase(SEI).And the low viscosity of DEE also ensures that the ester electrolyte poses good interracial wettability.As a result,our designed electrolyte enables the high-loading Li‖NCM622 and Li‖NCM811(^(3) mA h cm^(-2)) full cells to achieve stable cycling over 200 cycles,8 times longer than that of a conventional ester electrolyte.This work suggests that regulation of intermolecular interactions in conventional ester electrolytes is a scalable and effective approach to achieve excellent electrochemical performance of LMBs.展开更多
Zinc metal is regarded as one of the most promising anodes for Zn-based batteries in next-generation energy storage systems.However,the dendrite growth and interfacial corrosion lead to poor reversibility and cycle li...Zinc metal is regarded as one of the most promising anodes for Zn-based batteries in next-generation energy storage systems.However,the dendrite growth and interfacial corrosion lead to poor reversibility and cycle life of Zn anodes.Herein,we synthesize a 2-phosphate-1,2,4-butane tricarboxylic acid modified hyperbranched polyamidoamine containing rich terminal groups of phosphate and carboxyl(HPC)as modified layer for the Zn anodes.Importantly,the in situ acid-etching promotes the exposure of(002)Zn plane and the generated salt-polymer complexes could be adhered to the Zn anodes tightly.This greatly favors the uniform deposition of Zn and inhibits interfacial corrosion.Consequently,stable HPC@Zn anode plating/stripping for over 1200 h at a high areal capacity of 4 mAh/cm^(2)and a current density of 4 m A/cm^(2)is obtained.This study provides a new avenue of hyperbranched polymer in interfacial design for highly reversible and stable Zn metal anodes.展开更多
基金financially National Natural Science Foundation of China (Grant No. 22209134)Fundamental Research Funds for the Central Universities, Southwest Minzu University (Grant No. ZYN2023003)+1 种基金Sichuan Science and Technology Program (Grant No. 2024NSFSC1155)Fundamental Research Funds for the Central Universities, Southwest Jiaotong University (Grant No. 2682023CX005)。
文摘The poor compatibility of ester electrolytes with lithium metal anode severely limits its use in high voltage lithium metal batteries(LMBs).In this work,a bidentate solvent 1,2-diethoxyethane(DEE) is introduced into ester electrolyte to regulate the ion-dipole interactions to enhance the solubility of LiNO_(3),which enables compatibility with Li anode and maintains the high voltage cathode stability.In the designed electrolyte,the steric effect of DEE facilitates the participation of NO_(3)^(-)and PF_6^(-)anions in the Li^(+) solvation structure,thus promoting the generation of inorganic-rich solid electrolyte interphase(SEI).And the low viscosity of DEE also ensures that the ester electrolyte poses good interracial wettability.As a result,our designed electrolyte enables the high-loading Li‖NCM622 and Li‖NCM811(^(3) mA h cm^(-2)) full cells to achieve stable cycling over 200 cycles,8 times longer than that of a conventional ester electrolyte.This work suggests that regulation of intermolecular interactions in conventional ester electrolytes is a scalable and effective approach to achieve excellent electrochemical performance of LMBs.
基金financially supported by the National Natural Science Foundation of China(No.22209134)the Southwest Minzu University Research Startup Funds(No.RQD2021097)。
文摘Zinc metal is regarded as one of the most promising anodes for Zn-based batteries in next-generation energy storage systems.However,the dendrite growth and interfacial corrosion lead to poor reversibility and cycle life of Zn anodes.Herein,we synthesize a 2-phosphate-1,2,4-butane tricarboxylic acid modified hyperbranched polyamidoamine containing rich terminal groups of phosphate and carboxyl(HPC)as modified layer for the Zn anodes.Importantly,the in situ acid-etching promotes the exposure of(002)Zn plane and the generated salt-polymer complexes could be adhered to the Zn anodes tightly.This greatly favors the uniform deposition of Zn and inhibits interfacial corrosion.Consequently,stable HPC@Zn anode plating/stripping for over 1200 h at a high areal capacity of 4 mAh/cm^(2)and a current density of 4 m A/cm^(2)is obtained.This study provides a new avenue of hyperbranched polymer in interfacial design for highly reversible and stable Zn metal anodes.
