posted on 2020-03-18, 13:41authored byH. Hohyun Sun, Hoon-Hee Ryu, Un-Hyuck Kim, Jason A. Weeks, Adam Heller, Yang-Kook Sun, C. Buddie Mullins
This Perspective
discusses the prospective strategies for overcoming
the stability and capacity trade-off associated with increased Ni
content in layered Ni-rich Li[NixCoyMnz]O2 (NCM) and Li[NixCoyAlz]O2 (NCA) cathodes.
The Ni-rich NCM and NCA cathodes have largely replaced the LiCoO2 cathodes in commercial batteries because of their lower cost,
higher energy density, good rate capability, and reliability that
has been extensively field-tested. Nevertheless, they suffer from
microcrack generation along grain boundaries and Ni3+/4+ reactivity that rapidly deteriorate electrochemical performance.
Doping and coating have been efficient strategies in delaying the
onset of the damage, but they fail to overcome the degradation. There
are, however, alternative strategies that directly counter the inherent
degradation through micro- and nanostructural modifications of the
Ni-rich NCM and NCA cathodes.