Lattice-Oxygen-Stabilized Li- and Mn-Rich Cathodes with Sub-Micrometer Particles by Modifying the Excess-Li Distribution

被引：43

作者：

Hwang, Jaeseong ^{[1
]}

Myeong, Seungjun ^{[1
]}

Lee, Eunryeol ^{[1
]}

Jang, Haeseong ^{[1
]}

Yoon, Moonsu ^{[1
]}

Cha, Hyungyeon ^{[1
]}

Sung, Jaekyung ^{[1
]}

Kim, Min Gyu ^{[2
]}

Seo, Dong-Hwa ^{[1
]}

Cho, Jaephil ^{[1
]}

机构：

[1] Ulsan Natl Inst Sci & Technol UNIST, Dept Energy Engn, Dept Energy & Chem Engn, 50 Unist Gil, Ulsan 44919, South Korea

[2] Pohang Accelerator Lab PAL, Beamline Res Div, Pohang 37673, Kyungbuk, South Korea

来源：

ADVANCED MATERIALS | 2021年 / 33卷 / 18期

关键词：

excess‐ Li distribution; lattice‐ oxygen stability; Li‐ and Mn‐ rich layered oxides; ion batteries; practical applications; LAYERED OXIDES; VOLTAGE DECAY; REDOX ACTIVITY; ANIONIC REDOX; LITHIUM;

D O I：

10.1002/adma.202100352

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In recent years, Li- and Mn-rich layered oxides (LMRs) have been vigorously explored as promising cathodes for next-generation, Li-ion batteries due to their high specific energy. Nevertheless, their actual implementation is still far from a reality since the trade-off relationship between the particle size and chemical reversibility prevents LMRs from achieving a satisfactory, industrial energy density. To solve this material dilemma, herein, a novel morphological and structural design is introduced to Li1.11Mn0.49Ni0.29Co0.11O2, reporting a sub-micrometer-level LMR with a relatively delocalized, excess-Li system. This system exhibits an ultrahigh energy density of 2880 Wh L-1 and a long-lasting cycle retention of 83.1% after the 100th cycle for 45 degrees C full-cell cycling, despite its practical electrode conditions. This outstanding electrochemical performance is a result of greater lattice-oxygen stability in the delocalized excess-Li system because of the low amount of highly oxidized oxygen ions. Geometric dispersion of the labile oxygen ions effectively suppresses oxygen evolution from the lattice when delithiated, eradicating the rapid energy degradation in a practical cell system.

引用

页数：11

共 43 条

[1] Fundamental understanding and practical challenges of anionic redox activity in Li-ion batteries [J].