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
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.
