期刊
NANO ENERGY
卷 100, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107482
关键词
Sodium-ion batteries; P2-type NiMn-based layered oxides; Na site rearrangement; Smooth kinetic process; Structural regulation
类别
资金
- National Key Research and Development Program of China [2020YFA0406203]
- National Natural Science Foundation of China [U2032167, 52072008]
- Guangdong Basic and Applied Basic Research Foundation [2019B1515120028]
- Shenzhen Fundamental Research Program [GXWD20201231165807007-202008071214001]
The arrangement of Na+ in layered cathode materials has been adjusted through a combination approach, resulting in outstanding rate performance, smooth kinetic process, and excellent cycling performance. This study sheds light on the role of different Na sites and provides a universal and practical approach to adjusting the distribution of Na+ in P2-type cathode materials.
The electrochemical performance and structural stability of sodium-ion battery is substantially dependent on the occupancy and distribution of Na+ in cathode materials. However, it is challenging to simultaneously regulate the occupancy and optimize the distribution of Na+ in cathodes for higher capacity and superior cyclability. Here we attempt to adjust the arrangement of Na+ in layered cathode materials by applying a combination approach, including enhancing the Na content, disrupting transition metal ordering and strengthening Na+-TMn+ elec-trostatic force. Through detailed structural characterizations on cathodes, it is revealed that the rearrangement of Na+ at two distinct Wyckoff positions can be realized in Li/Ti-codoped Na2/3Ni1/3Mn2/3O2 cathodes, contrib-uting to outstanding rate performance and smooth kinetic process. In addition, the inhibited P2-O2 phase transition and intact lattice structure is closely related to the rearranged Na layer and strengthened transition metal slab, jointly resulting in excellent long cycling performance with 90.2% capacity retention after 200 cycles at 1 C (150 mA/g). This work sheds new light on the role of different Na sites and provides a universal and practical approach to adjusting the Na+ distribution in P2-type cathode materials.
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