Open AccessSuppressing Manganese Dissolution via Exposing Stable {111} Facets for High‐Performance Lithium‐Ion Oxide Cathode
Author(s) -
Xiao Yao,
Zhang XuDong,
Zhu YanFang,
Wang PengFei,
Yin YaXia,
Yang Xinan,
Shi JiLei,
Liu Jian,
Li Hongliang,
Guo XiaoDong,
Zhong BenHe,
Guo YuGuo
Publication year - 2019
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201801908
Subject(s) - cathode , dissolution , manganese , transmission electron microscopy , spinel , scanning electron microscope , materials science , lithium (medication) , electrochemistry , x ray photoelectron spectroscopy , chemical engineering , scanning transmission electron microscopy , electrode , oxide , focused ion beam , ion , analytical chemistry (journal) , nanotechnology , chemistry , composite material , metallurgy , medicine , chromatography , endocrinology , engineering , organic chemistry
Spinel‐type LiMn 2 O 4 cathode materials commonly suffer from manganese dissolution due to the severe interfacial side reactions especially at elevated temperature. Here, a 3D hollow fusiform LiMn 2 O 4 cathode material is reported with preferentially exposed stable {111} facets and seamless outer structure, which is clearly confirmed by microfocused ion beam scanning electron microscopy, high‐resolution transmission electron microscopy as well as scanning transmission electron microscopy with atomic resolution. Owing to the optimal geometrical structure design and the preferentially exposed stable {111} facets, the electrode delivers excellent rate capability (107.6 mAh g −1 at 10 C), remarkable cycling stability (83.3% capacity retention after 1000 cycles at 1 C), and outstanding high‐temperature performance. Together with the analyses of electrochemical behaviors, in situ X‐ray diffraction at different temperatures, and ex situ X‐ray photoelectron spectra, the underlying working mechanism for suppressing manganese dissolution is clearly articulated. These findings could provide significant guidelines for precisely designing highly stable cathode materials for LIBs.