Countering the Segregation of Transition‐Metal Ions in LiMn1/3Co1/3Ni1/3O2 Cathode for Ultralong Life and High‐Energy Li‐Ion Batteries |
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| Authors: | Dong Luo Shaohua Fang Yu Tamiya Li Yang Shin‐ichi Hirano |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China;2. Institute of Materials and Systems for Sustainability, Nagoya University, Furo‐cho, Chikusa‐ku, Nagoya, Japan;3. Hirano Institute for Materials Innovation, Shanghai Jiao Tong University, Shanghai, China |
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| Abstract: | High‐voltage layered lithium transition‐metal oxides are very promising cathodes for high‐energy Li‐ion batteries. However, these materials often suffer from a fast degradation of cycling stability due to structural evolutions. It seriously impedes the large‐scale application of layered lithium transition‐metal oxides. In this work, an ultralong life LiMn1/3Co1/3Ni1/3O2 microspherical cathode is prepared by constructing an Mn‐rich surface. Its capacity retention ratio at 700 mA g?1 is as large as 92.9% after 600 cycles. The energy dispersive X‐ray maps of electrodes after numerous cycles demonstrate that the ultralong life of the as‐prepared cathode is attributed to the mitigation of TM‐ions segregation. Additionally, it is discovered that layered lithium transition‐metal oxide cathodes with an Mn‐rich surface can mitigate the segregation of TM ions and the corrosion of active materials. This study provides a new strategy to counter the segregation of TM ions in layered lithium transition‐metal oxides and will help to the design and development of high‐energy cathodes with ultralong life. |
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| Keywords: | microspheres lithium‐ion batteries Mn‐rich surfaces transition‐metal ions ultralong life |
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