氧化还原
阴极
相(物质)
兴奋剂
氧化物
降级(电信)
过渡金属
化学
结构稳定性
扩散
八面体
离子
材料科学
相变
无机化学
化学工程
物理化学
冶金
催化作用
热力学
光电子学
工程类
物理
有机化学
电信
结构工程
生物化学
计算机科学
作者
Soyeong Yun,Shoaib Muhammad,Jinhyuk Choi,Chang Kyu Lee,Junwoo Yu,Hayeon Lee,Yong Jae Lee,Won‐Sub Yoon
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2022-10-20
卷期号:7 (11): 3989-3996
被引量:2
标识
DOI:10.1021/acsenergylett.2c02239
摘要
Li-rich layered oxides have received the spotlight as cathode materials to improve the energy density in recent years. However, Li-rich layered oxides accompanied by cation migration during extended cycles suffer from low-capacity retention and structural degradation through the phase transition. In this study, we synthesized a Li2IrO3 material substituting Sn for Ir, confirming that Li2Ir0.75Sn0.25O3 exhibits improved cycle performance and structural stability. This enhancement is due to the highly reversible structural changes originating from the biphasic reaction, including the O3′ phase. The intermediate O3′ phase has a distorted IrO6 octahedron by the migration of Sn, thus enlarging interslab thickness and providing a facile Li diffusion environment. More importantly, migrated Sn ions can return to the transition metal layer during the discharging process. This reversible cation migration prevents structural collapse, thus improving cycle performance. These fundamental understandings of reversible cation migration for the Li-rich materials can provide insightful factors for designing high-energy cathode materials.
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