电解质
材料科学
电化学
阴极
插层(化学)
相间
化学工程
无机化学
电极
氧化物
化学
冶金
工程类
物理化学
遗传学
生物
作者
Ya You,Sen Xin,Hooman Yaghoobnejad Asl,Wangda Li,Pengfei Wang,Yu‐Guo Guo,Arumugam Manthiram
出处
期刊:Chem
[Elsevier]
日期:2018-09-01
卷期号:4 (9): 2124-2139
被引量:108
标识
DOI:10.1016/j.chempr.2018.05.018
摘要
By virtue of their prominent advantages in terms of capacity and voltage output and cost, O3-type layered transition-metal oxides are considered promising cathode materials for sodium-ion batteries (SIBs). However, their unstable electrochemistry at high voltages due to complex multiphase evolution in the bulk structure and continuous degradation of the electrolyte-cathode interphase hampers their practical viability. Here, we reveal a dual-stabilization effect of the cation dopants on the evolution of the bulk structure and electrode-electrolyte interphase of a Li-substituted O3-type cathode upon Na (de)intercalation. The incorporation of Li into the transition-metal layer could mitigate the Jahn-Teller distortion of the Ni3+ ion and prevent the loss of active transition-metal ions so that the unfavorable high-voltage phase transition and the degradation of the electrolyte-cathode interphase are suppressed. As a result, the Li-incorporated cathode material displays a high reversible capacity with good high-voltage durability to facilitate its service in high-energy-density SIBs.
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