当前位置: X-MOL 学术Nano Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
P2/O3 biphasic Fe/Mn-based layered oxide cathode with ultrahigh capacity and great cyclability for sodium ion batteries
Nano Energy ( IF 16.8 ) Pub Date : 2021-09-10 , DOI: 10.1016/j.nanoen.2021.106504
Cong Chen 1 , Weiyuan Huang 1 , Yiwei Li 1 , Mingjian Zhang 1 , Kaiqi Nie 2 , Jiaou Wang 2 , Wenguang Zhao 1 , Rui Qi 1 , Changjian Zuo 1 , Zhibo Li 1 , Haocong Yi 1 , Feng Pan 1
Affiliation  

As the representative layered oxide cathode for sodium ion batteries (SIBs) featuring the low cost, P2-type Na-Fe-Mn oxide (NFMO) delivers a high capacity but a limited cycling stability, while O3-type NFMO shows extended cycling lifespan but a lower capacity. Considering the complementarity of two phases in electrochemistry, we successfully designed and fabricated a Fe/Mn-based layered oxide Na0.67Li0.11Fe0.36Mn0.36Ti0.17O2 with a unique P2/O3 biphasic architecture through high-proportion Li/Ti co-substitution. High-proportion Li substitution in transition metal layers triggers the reversible O redox below 4.2 V due to the formation of the special O bonding environment, delivering a highest capacity of 235 mA h g1 ever reported among all Fe- and Mn-based layered oxide cathodes. Moreover, the unique intersected complex way at the phase boundary significantly suppressed the P2→OP4 phase transition and decreased the lattice mismatch between two phases at high potentials, greatly enhancing the cycling stability. This novel phase complex strategy benefits the design of promising cathode materials with high capacity and long lifespan for SIBs and beyond.



中文翻译:

具有超高容量和良好循环性能的P2/O3双相Fe/Mn基层状氧化物正极用于钠离子电池

作为钠离子电池(SIBs)的代表性层状氧化物正极,具有低成本的特点,P2 型 Na-Fe-Mn 氧化物(NFMO)提供高容量但循环稳定性有限,而 O3 型 NFMO 显示出更长的循环寿命但较低的容量。考虑到电化学中两相的互补性,我们成功设计并制备了 Fe/Mn 基层状氧化物 Na 0.67 Li 0.11 Fe 0.36 Mn 0.36 Ti 0.17 O 2通过高比例的 Li/Ti 共取代具有独特的 P2/O3 双相结构。由于形成特殊的 O 键合环境,过渡金属层中高比例的 Li 取代触发了低于 4.2 V 的可逆 O 氧化还原,在所有 Fe 和 Mn 基层状氧化物正极中提供了有史以来报告的最高容量 235 mAh g 1 . 此外,相边界处独特的交叉复杂方式显着抑制了 P2→OP4 相变,减少了高电位下两相之间的晶格失配,大大提高了循环稳定性。这种新颖的相复合策略有利于设计具有高容量和长寿命的 SIB 及其他正极材料。

更新日期:2021-09-12
down
wechat
bug