氧化还原
阴极
氧气
阳离子聚合
氧化物
材料科学
金属
离子
析氧
电化学
化学工程
无机化学
化学
冶金
电极
物理化学
高分子化学
有机化学
工程类
作者
Xin Cao,Xiang Li,Yu Qiao,Min Jia,Feilong Qiu,Yibo He,Ping He,Haoshen Zhou
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2019-09-04
卷期号:4 (10): 2409-2417
被引量:128
标识
DOI:10.1021/acsenergylett.9b01732
摘要
Anionic redox reveals to be a promising strategy to effectively improve the energy density of layered metal oxide cathodes for sodium-ion batteries. However, lattice oxygen loss and derived structural distortion severely hinder its practical application. Herein, combined with anionic and cationic redox activities, we developed a layered structure P2-type Na0.66Li0.22Ti0.15Mn0.63O2 cathode, delivering an initial discharge capacity of 228 mAh g–1 and highly reversible structural evolution as well as improved cyclability. On the basis of comprehensive comparison with Ti-free P2-Na0.66Li0.22Mn0.78O2, both oxygen-related negative behaviors (irreversible O2 evolution and superoxo-related parasitic production) and Mn-related Jahn–Teller distortion have been effectively restrained by simultaneously suppressing both oxygen loss and the participation of Mn4+/Mn3+ redox. Not limited to discovering excess capacity derived from anionic oxidation up charging, our findings not only highlight an effective strategy to stabilize anionic and cationic redox activities but also pave the way for the further improvement of Na-deficient layered materials for high-energy sodium-ion batteries.
科研通智能强力驱动
Strongly Powered by AbleSci AI