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Developing an abnormal high-Na-content P2-type layered oxide cathode with near-zero-strain for high-performance sodium-ion batteries
Ist Teil von
Chemical science (Cambridge), 2024-04, Vol.15 (14), p.5192-52
Ort / Verlag
England: Royal Society of Chemistry
Erscheinungsjahr
2024
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
Layered transition metal oxides (Na
x
TMO
2
) possess attractive features such as large specific capacity, high ionic conductivity, and a scalable synthesis process, making them a promising cathode candidate for sodium-ion batteries (SIBs). However, Na
x
TMO
2
suffer from multiple phase transitions and Na
+
/vacancy ordering upon Na
+
insertion/extraction, which is detrimental to their electrochemical performance. Herein, we developed a novel cathode material that exhibits an abnormal P2-type structure at a stoichiometric content of Na up to 1. The cathode material delivers a reversible capacity of 108 mA h g
−1
at 0.2C and 97 mA h g
−1
at 2C, retaining a capacity retention of 76.15% after 200 cycles within 2.0-4.3 V.
In situ
diffraction studies demonstrated that this material exhibits an absolute solid-solution reaction with a low volume change of 0.8% during cycling. This near-zero-strain characteristic enables a highly stabilized crystal structure for Na
+
storage, contributing to a significant improvement in battery performance. Overall, this work presents a simple yet effective approach to realizing high Na content in P2-type layered oxides, offering new opportunities for high-performance SIB cathode materials.
A Mg-substituted abnormal P2-Na
x
TMO
2
cathode material with a stoichiometric content of Na up to 1 was developed. Such ultrahigh Na content in the P2-type structure enables an absolute solid-solution reaction with near-zero-strain characteristics.