Manipulating External Electric Field and Tensile Strain toward High Energy Density Stability in Fast-Charging Li-Rich Cathode Materials

The Journal of Physical Chemistry Letters
Pengfei LiuDong-Liang Peng

Abstract

Li-rich layered oxides (LLOs) are promising cathodes for lithium-ion batteries because of their high energy density provided by anionic redox. Although great improvements have been achieved in electrochemical performance, little attention has been paid to the energy density stability during fast charging. Indeed, LLOs have severe capacity fading and voltage decay especially at a high state of charge (SOC), disabling the application of the frequently used constant-current-constant-voltage mode for fast charging. Herein, we address this problem by manipulating the external electric field and tensile strain induced by lattice expansion effect in nanomaterials under the guidance of theoretical calculations, which indicate that LLOs at high SOC have almost a zero band gap and a low oxygen formation energy. This strategy will weaken polarization, stabilize lattice oxygen, and restrict phase transition simultaneously. Thus, the energy density during fast charging can be highly stabilized. Therefore, it may be of great value for the practical application of layered cathodes.

References

Oct 13, 2000·Physical Review Letters·S TsunekawaA Kasuya
Mar 13, 2009·Nature·Byoungwoo Kang, Gerbrand Ceder
Jun 17, 2014·Physical Chemistry Chemical Physics : PCCP·Danna QianYing Shirley Meng
Apr 26, 2017·Chemical Society Reviews·Wangda LiArumugam Manthiram
Apr 13, 2018·Nature·Jinhyuk LeeGerbrand Ceder
Apr 2, 2019·The Journal of Physical Chemistry Letters·Pengfei LiuDong-Liang Peng
Apr 24, 2019·Nature Nanotechnology·Pengfei YanChongmin Wang
May 30, 2019·The Journal of Physical Chemistry Letters·Laura SimonelliDino Tonti
Jun 30, 2019·Journal of the American Chemical Society·Zhenlian ChenXiao Cheng Zeng

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