Realizing high-capacity and low-strain manganese-based sodium cathode by regulating the doping sites of Mg with a post-doping approach

Dong，Mingjie1; Yang，Maolin1; Chen，Ziwei1,2; Zhao，Wenguang1; Huang，Zhongyuan1; Chen，Guojie1; Tong，Wenxin1; Chen，Sijia1; Ji，Wenhai3,4; Yang，Tingting5; Chen，Huaican3,4; Miao，Ping3,4; Yin，Wen3,4; Wang，Jun6; Wang，Rui7; Xiao，Yinguo1

2024-12-15

10.1016/j.jpowsour.2024.235391

Journal of Power Sources   影响因子和分区

0378-7753

Fe/Mn based P2-type layered oxides consistently encounter challenges with suboptimal electrochemical cyclability. Here, this work reports a post-doping treatment approach, successfully leading to the introduction of Mg into the Na layer as a priority, resulting in a significant improvement in both the capacity and cycle stability. The advanced structural characterization technology reveals that Mg located in the Na layer play a crucial “pillar” role in the cycling process. Furthermore, the presence of Mg on Na-site can reduce the valence state of Mn and enhance the capacity. The [NaMg(FeMnMg)]O cathode treated by post-doping has a high reversible specific capacity of 179 mAh g at 0.2C between 2.0 V and 4.0 V. Even at the high rate of 5C, it still maintains a capacity retention of 67.4 % after 500 cycles. This study offers a novel viewpoint for the design of cathode materials with high capacity and high cycle stability.

Fe/Mn based layered oxides Mg post-doping Na-site doping Sodium-ion batteries

英语

其他

2-s2.0-85203286165

Scopus

1.School of Advanced Materials,Peking University,Shenzhen Graduate School,Shenzhen,518055,China
2.Institute of Zhejiang University-Quzhou,Quzhou,Zheda Road 99,324000,China
3.Institute of High Energy Physics,Chinese Academy of Sciences,Beijing,100049,China
4.Spallation Neutron Source Science Center,Dongguan,523803,China
5.Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons,Forschungszentrum Jülich GmbH,Jülich,Germany
6.School of Innovation and Entrepreneurship,Southern University of Science and Technology,Shenzhen,518055,China
7.Department of Engineering,University of Cambridge,Cambridge,17 Charles Babbage Road,CB3 0FS,United Kingdom

Dong，Mingjie,Yang，Maolin,Chen，Ziwei,et al. Realizing high-capacity and low-strain manganese-based sodium cathode by regulating the doping sites of Mg with a post-doping approach[J]. Journal of Power Sources,2024,623.

Dong，Mingjie.,Yang，Maolin.,Chen，Ziwei.,Zhao，Wenguang.,Huang，Zhongyuan.,...&Xiao，Yinguo.(2024).Realizing high-capacity and low-strain manganese-based sodium cathode by regulating the doping sites of Mg with a post-doping approach.Journal of Power Sources,623.

Dong，Mingjie,et al."Realizing high-capacity and low-strain manganese-based sodium cathode by regulating the doping sites of Mg with a post-doping approach".Journal of Power Sources 623(2024).