首页|Degradation analysis and doping modification optimization for high-voltage P-type layered cathode in sodium-ion batteries
Degradation analysis and doping modification optimization for high-voltage P-type layered cathode in sodium-ion batteries
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Advancing high-voltage stability of layered sodium-ion oxides represents a pivotal avenue for their pro-gress in energy storage applications.Despite this,a comprehensive understanding of the mechanisms underpinning their structural deterioration at elevated voltages remains insufficiently explored.In this study,we unveil a layer delamination phenomenon of Na0.67Ni0.3Mn0.7O2(NNM)within the 2.0-4.3 V voltage,attributed to considerable volumetric fluctuations along the c-axis and lattice oxygen reactions induced by the simultaneous Ni3+/Ni4+and anion redox reactions.By introducing Mg doping to dimin-ished Ni-O antibonding,the anion oxidation-reduction reactions are effectively mitigated,and the struc-tural integrity of the P2 phase remains firmly intact,safeguarding active sites and precluding the formation of novel interfaces.The Na0.67Mg0.05Ni0.25Mn0.7O2(NMNM-5)exhibits a specific capacity of 100.7 mA h g-1,signifying an 83％improvement compared to the NNM material within the voltage of 2.0-4.3 V.This investigation underscores the intricate interplay between high-voltage stability and struc-tural degradation mechanisms in layered sodium-ion oxides.
Soidum ion batteriesLayer cathode materialsP-typeHigh-voltage performanceDegradation analysis
Bao Zhang、Yi Zhao、Minghuang Li、Qi Wang、Lei Cheng、Lei Ming、Xing Ou、Xiaowei Wang
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National Engineering Laboratory for High-Efficiency Recovery of Refractory Nonferrous Metals,School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China
Zhejiang Power New Energy Co.,LTD,Zhuji 311800,Zhejiang,China
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