Cargando…

Outside‐In Nanostructure Fabricated on LiCoO(2) Surface for High‐Voltage Lithium‐Ion Batteries

The energy density of batteries with lithium cobalt oxide (LCO) can be maximized by increasing the cut‐off voltage to approach the theoretical capacity limit. However, it is not realized in the practical applications due to the restricted cycle life caused by vulnerable cathode surface in deep delit...

Descripción completa

Detalles Bibliográficos
Autores principales: Mao, Shulan, Shen, Zeyu, Zhang, Weidong, Wu, Qian, Wang, Zhuoya, Lu, Yingying
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9008786/
https://www.ncbi.nlm.nih.gov/pubmed/35170232
http://dx.doi.org/10.1002/advs.202104841
Descripción
Sumario:The energy density of batteries with lithium cobalt oxide (LCO) can be maximized by increasing the cut‐off voltage to approach the theoretical capacity limit. However, it is not realized in the practical applications due to the restricted cycle life caused by vulnerable cathode surface in deep delithiation state, where severe side reactions, oxygen/cobalt loss and structure degradation often happen. Here, an outside‐in oriented nanostructure on LiCoO(2) crystals is fabricated. The outer electrochemically stable LiF and Li(2)CoTi(3)O(8) particles perform as physical barrier to prevent damage of both cathodes and electrolytes, while the inner F doping promote Li ions diffusivity and stabilize the lattice oxygen. With the spinel‐like transition layer between them, a solid and complete lithium‐ion transport channel generation along the lithium concentration gradient. Under the protection from this structure, the LiCoO(2) withstand the high voltage of 4.6 V and the LCO/graphite pouch full cell with high loading density exhibits 81.52% energy density retention after 135 cycles at 4.5 V.