Nano-Micro Letters, Volume. 16, Issue 1, 010(2024)
High-Entropy Layered Oxide Cathode Enabling High-Rate for Solid-State Sodium-Ion Batteries
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 Na0.95Li0.06Ni0.25Cu0.05Fe0.15Mn0.49O2. 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.
Get Citation
Copy Citation Text
Tianxun Cai, Mingzhi Cai, Jinxiao Mu, Siwei Zhao, Hui Bi, Wei Zhao, Wujie Dong, Fuqiang Huang. High-Entropy Layered Oxide Cathode Enabling High-Rate for Solid-State Sodium-Ion Batteries[J]. Nano-Micro Letters, 2024, 16(1): 010
Category: Research Articles
Received: Jun. 28, 2023
Accepted: Sep. 28, 2023
Published Online: Jan. 23, 2025
The Author Email: Huang Fuqiang (huangfq@mail.sic.ac.cn)