title: Countering the Segregation of Transition-Metal Ions in LiMn1/3 Co1/3 Ni1/3 O2 Cathode for Ultralong Life and High-Energy Li-Ion Batteries.
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 LiMn1/3 Co1/3 Ni1/3 O2 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.
authors.affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Luo
authors.affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
authors.forename: Shaohua
authors.initials: S
authors.lastname: Fang
authors.affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.|Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan.
authors.forename: Yu
authors.initials: Y
authors.lastname: Tamiya
authors.affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.|Hirano Institute for Materials Innovation, Shanghai Jiao Tong University, Shanghai, 200240, China.
authors.forename: Li
authors.initials: L
authors.lastname: Yang
authors.affiliation: Hirano Institute for Materials Innovation, Shanghai Jiao Tong University, Shanghai, 200240, China.
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Hirano
keywords: Mn-rich surfaces; lithium-ion batteries; microspheres; transition-metal ions; ultralong life