阴极
材料科学
离子
热稳定性
氧化物
化学工程
离子键合
相变
钠离子电池
储能
离子电导率
电化学
电极
化学
热力学
物理化学
冶金
法拉第效率
功率(物理)
物理
有机化学
工程类
电解质
作者
Tianxun Cai,Mingzhi Cai,Jinxiao Mu,Siwei Zhao,Hui Bi,Wei Zhao,Wujie Dong,Fuqiang Huang
标识
DOI:10.1007/s40820-023-01232-0
摘要
Abstract Na-ion O3-type layered oxides are prospective cathodes for Na-ion batteries due to high energy density and low-cost. Nevertheless, such cathodes usually suffer from phase transitions, sluggish kinetics and air instability, making it difficult to achieve high performance solid-state sodium-ion batteries. Herein, the high-entropy design and Li doping strategy alleviate lattice stress and enhance ionic conductivity, achieving high-rate performance, air stability and electrochemically thermal stability for Na 0.95 Li 0.06 Ni 0.25 Cu 0.05 Fe 0.15 Mn 0.49 O 2 . This cathode delivers a high reversible capacity (141 mAh g −1 at 0.2C), excellent rate capability (111 mAh g −1 at 8C, 85 mAh g −1 even at 20C), and long-term stability (over 85% capacity retention after 1000 cycles), which is attributed to a rapid and reversible O3–P3 phase transition in regions of low voltage and suppresses phase transition. Moreover, the compound remains unchanged over seven days and keeps thermal stability until 279 ℃. Remarkably, the polymer solid-state sodium battery assembled by this cathode provides a capacity of 92 mAh g −1 at 5C and keeps retention of 96% after 400 cycles. This strategy inspires more rational designs and could be applied to a series of O3 cathodes to improve the performance of solid-state Na-ion batteries.
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