In Na-ion batteries,O3-type layered oxide cathode materials encounter challenges such as particle cracking,oxygen loss,electrolyte side reactions,and multi-phase transitions during the charge/discharge process.This st...In Na-ion batteries,O3-type layered oxide cathode materials encounter challenges such as particle cracking,oxygen loss,electrolyte side reactions,and multi-phase transitions during the charge/discharge process.This study focuses on surface coating with NiTiO_(3) achieved via secondary heat treatment using a coating precursor and the surface material.Through in-situ x-ray diffraction(XRD)and differential electrochemical mass spectrometry(DEMS),along with crystal structure characterizations of post-cycling materials,it was determined that the NiTiO_(3) coating layer facilitates the formation of a stable lattice structure,effectively inhibiting lattice oxygen loss and reducing side reaction with the electrolyte.This enhancement in cycling stability was evidenced by a capacity retention of approximately 74%over 300 cycles at 1 C,marking a significant 30%improvement over the initial sample.Furthermore,notable advancements in rate performance were observed.Experimental results indicate that a stable and robust surface structure substantially enhances the overall stability of the bulk phase,presenting a novel approach for designing layered oxide cathodes with higher energy density.展开更多
本工作采用(氟磺酰)(三氟甲基磺酰)亚胺锂{Li[(FSO2)(CF3SO2)N],Li FTFSI}和聚氧乙烯(PEO)分别作为导电锂盐和聚合物主链,通过简单的溶液浇铸法制备了新型固态聚合物电解质(SPEs),并采取示差扫描量热(DSC)、热重(TGA)、线性扫描伏安(LSV...本工作采用(氟磺酰)(三氟甲基磺酰)亚胺锂{Li[(FSO2)(CF3SO2)N],Li FTFSI}和聚氧乙烯(PEO)分别作为导电锂盐和聚合物主链,通过简单的溶液浇铸法制备了新型固态聚合物电解质(SPEs),并采取示差扫描量热(DSC)、热重(TGA)、线性扫描伏安(LSV)、交流阻抗(EIS)和恒电位直流(DC)极化等方法研究了Li FTFSI/PEO(EO/Li^+摩尔比为16)电解质的理化性质和电化学性质。结果表明,Li FTFSI/PEO电解质具有较高的室温离子电导率(σ≈10^(-5) S/cm),较高的氧化电位(4.63 V vs.Li/Li^+),并且耐热温度高达256℃。锂硫电池测试结果表明,该类SPEs展现出相对高的首周放电比容量(881 m A·h/g),有效地抑制了多硫离子的"穿梭效应",表现出良好的电池循环性能。展开更多
Na-ion batteries(NIBs)are regarding as the optimum complement for Li-ion batteries along with the rapid development of stationary energy storage systems.In order to meet the commercial demands of cathodes for NIBs,O3-...Na-ion batteries(NIBs)are regarding as the optimum complement for Li-ion batteries along with the rapid development of stationary energy storage systems.In order to meet the commercial demands of cathodes for NIBs,O3-type Cu containing layered oxide Na_(0.9)0Cu_(0.22)Fe_(0.30)Mn_(0.48O_(2))with good comprehensive performance and low-cost element components is very promising for the practical use.However,only part of the Cu^(3+)/Cu^(2+)redox couple participated in the redox reaction,thus impairing the specific capacity of the cathode materials.Herein,Mg2+-doped O3-Na0.90Mg0.08Cu0.22Fe0.30Mn0.40O_(2)layered oxide without Mn3+was synthesized successfully,which exhibited improved reversible specific capacity of 118 mAh/g in the voltage range of 2.4-4.0 V at 0.2 C,corresponding to the intercalation/deintercalation of 0.47 Na+(0.1 more than that of Na_(0.9)0Cu_(0.22)Fe_(0.30)Mn_(0.48O_(2))).This work demonstrates an important strategy to obtain advanced layered oxide cathodes for NIBs.展开更多
Na-ion batteries(NIBs),as one of the next-generation rechargeable battery systems,hold great potential in large-scale energy storage applications owing to the abundance and costeffectiveness of sodium resources.Despit...Na-ion batteries(NIBs),as one of the next-generation rechargeable battery systems,hold great potential in large-scale energy storage applications owing to the abundance and costeffectiveness of sodium resources.Despite the extensive exploration of electrode materials,the relatively low attainable capacity of NIBs hinders their practical application.In recent years,the anionic redox reaction(ARR)in NIBs has been emerging as a new paradigm to deliver extra capacity and thus offers an opportunity to break through the intrinsic energy density limit.In this review,the fundamental investigation of the ARR mechanism and the latest exploration of cathode materials are summarized,in order to highlight the significance of reversible anionic redox and suggest prospective developing directions.展开更多
基金Project supported by the National Key R&D Program of China (Grant No.2022YFB2402500)the National Natural Science Foundation of China (Grant Nos.52122214,92372116,and 52394174)+2 种基金Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No.2020006)Jiangsu Province Carbon Peak and Neutrality Innovation Program (Industry tackling on prospect and key technology BE2022002-5)Guangxi Power Grid Project (Grant No.GXKJXM20210260)。
文摘In Na-ion batteries,O3-type layered oxide cathode materials encounter challenges such as particle cracking,oxygen loss,electrolyte side reactions,and multi-phase transitions during the charge/discharge process.This study focuses on surface coating with NiTiO_(3) achieved via secondary heat treatment using a coating precursor and the surface material.Through in-situ x-ray diffraction(XRD)and differential electrochemical mass spectrometry(DEMS),along with crystal structure characterizations of post-cycling materials,it was determined that the NiTiO_(3) coating layer facilitates the formation of a stable lattice structure,effectively inhibiting lattice oxygen loss and reducing side reaction with the electrolyte.This enhancement in cycling stability was evidenced by a capacity retention of approximately 74%over 300 cycles at 1 C,marking a significant 30%improvement over the initial sample.Furthermore,notable advancements in rate performance were observed.Experimental results indicate that a stable and robust surface structure substantially enhances the overall stability of the bulk phase,presenting a novel approach for designing layered oxide cathodes with higher energy density.
文摘本工作采用(氟磺酰)(三氟甲基磺酰)亚胺锂{Li[(FSO2)(CF3SO2)N],Li FTFSI}和聚氧乙烯(PEO)分别作为导电锂盐和聚合物主链,通过简单的溶液浇铸法制备了新型固态聚合物电解质(SPEs),并采取示差扫描量热(DSC)、热重(TGA)、线性扫描伏安(LSV)、交流阻抗(EIS)和恒电位直流(DC)极化等方法研究了Li FTFSI/PEO(EO/Li^+摩尔比为16)电解质的理化性质和电化学性质。结果表明,Li FTFSI/PEO电解质具有较高的室温离子电导率(σ≈10^(-5) S/cm),较高的氧化电位(4.63 V vs.Li/Li^+),并且耐热温度高达256℃。锂硫电池测试结果表明,该类SPEs展现出相对高的首周放电比容量(881 m A·h/g),有效地抑制了多硫离子的"穿梭效应",表现出良好的电池循环性能。
基金supported by the National Natural Science Foundation of China(Grant Nos.51725206,52122214,and 52072403)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA21070500)+1 种基金Youth Innovation Promotion Association of the Chinese Academy of Sciences(Grant No.2020006)Beijing Municipal Natural Science Foundation,China(Grant No.2212022)。
文摘Na-ion batteries(NIBs)are regarding as the optimum complement for Li-ion batteries along with the rapid development of stationary energy storage systems.In order to meet the commercial demands of cathodes for NIBs,O3-type Cu containing layered oxide Na_(0.9)0Cu_(0.22)Fe_(0.30)Mn_(0.48O_(2))with good comprehensive performance and low-cost element components is very promising for the practical use.However,only part of the Cu^(3+)/Cu^(2+)redox couple participated in the redox reaction,thus impairing the specific capacity of the cathode materials.Herein,Mg2+-doped O3-Na0.90Mg0.08Cu0.22Fe0.30Mn0.40O_(2)layered oxide without Mn3+was synthesized successfully,which exhibited improved reversible specific capacity of 118 mAh/g in the voltage range of 2.4-4.0 V at 0.2 C,corresponding to the intercalation/deintercalation of 0.47 Na+(0.1 more than that of Na_(0.9)0Cu_(0.22)Fe_(0.30)Mn_(0.48O_(2))).This work demonstrates an important strategy to obtain advanced layered oxide cathodes for NIBs.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.51725206 and 52002394)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA21070500).
文摘Na-ion batteries(NIBs),as one of the next-generation rechargeable battery systems,hold great potential in large-scale energy storage applications owing to the abundance and costeffectiveness of sodium resources.Despite the extensive exploration of electrode materials,the relatively low attainable capacity of NIBs hinders their practical application.In recent years,the anionic redox reaction(ARR)in NIBs has been emerging as a new paradigm to deliver extra capacity and thus offers an opportunity to break through the intrinsic energy density limit.In this review,the fundamental investigation of the ARR mechanism and the latest exploration of cathode materials are summarized,in order to highlight the significance of reversible anionic redox and suggest prospective developing directions.
