Compositionally graded high-voltage P2-type cathode with superior structural stability and redox kinetics for advanced Na-ion batteries

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外文摘要：Layered P2-type cathodes with high voltage,large capacity,and easy synthesis show great potential for developing sodium(Na)-ion batteries(NIBs).However,the P2-O2 phase transition makes their structural degradation and the Na+/vacancy ordering lowers their redox kinetics.Here,we rationally propose a compositionally graded P2-type cathode,where nickel(Ni)and manganese(Mn)fractions decrease gradually,and cobalt(Co)content increases contiguously from the inside to the outside of a secondary particle.Inside these particles,the Ni/Mn-based compound delivers high capacity and high voltage.On the surface of particles,the Co/Mn-based solid solution offers a stable buffer matrix.Benefiting from these synergistic effects,this graded P2-type cathode shows the elimination of P2-O2 transformation even when charged to 4.4 V,which enables good structural stability,maintaining capacity retention reaching～80％within 300 cycles.Moreover,the Na+/vacancy ordering superstructure is further suppressed,and the Na+diffusion kinetics is significantly improved.The proposed graded structure with optimized chemical composition offers a new perspective for eliminating the unwanted phase transition and thus enhancing the electrochemistry of high-voltage layered cathodes for advanced NIBs.

外文关键词：

Na-ion batteryP2-type cathodecomposition regulationphase transitionredox stability

作者：

Peiyu Hou、Mohan Dong、Zhenbo Sun、Feng Li

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作者单位：

School of Physics and Technology,University of Jinan,Jinan 250022,China

基金：

National Natural Science Foundation of ChinaNatural Science Foundation of Shandong ProvinceChina Postdoctoral Science Foundation

项目编号：

52102252ZR2021QB0522021T140268

出版年：

2024

DOI：

10.1007/s12274-023-6181-1

纳米研究(英文版)

CSTPCD

ISSN：

年,卷(期)：2024.17(4)

参考文献量58