Details

Autor(en) / Beteiligte

• Hu, Hai-Yan
• Li, Jia-Yang
• Liu, Yi-Feng
• Zhu, Yan-Fang
• Li, Hong-Wei
• Jia, Xin-Bei
• Jian, Zhuang-Chun
• Liu, Han-Xiao
• Kong, Ling-Yi
• Li, Zhi-Qi
• Dong, Hang-Hang
• Zhang, Meng-Ke
• Qiu, Lang
• Wang, Jing-Qiang
• Chen, Shuang-Qiang
• Wu, Xiong-Wei
• Guo, Xiao-Dong
• Xiao, Yao

Titel

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

Link zum Volltext

Quelle

EZB Free E-Journals

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.