Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 166, Issue 8, Pages A1323-A1329Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0121908jes
Keywords
-
Funding
- National Natural Science Foundation of China [11575192]
- Beijing Natural Science Foundation [2182082]
- Scientific Instrument Developing Project [ZDKYYQ20170001]
- International Partnership Program [211211KYSB20170060, 211211KYSB20180020]
- Hundred Talents Project of the Chinese Academy of Sciences
Ask authors/readers for more resources
Lithium-rich manganese-based layered oxides (LLOs) cathodes attract great attention due to their high specific capacity. But the low rate capability, inferior cycling stability, voltage decay and the poor low-temperature performances hinder their application. Herein, we propose a synergistic strategy of Zr doping and Li2TiO3 coating to mitigate the drawbacks of Li1.2Ni0.2Mn0.6O2, and the cooperative modification mechanism is unraveled. In addition to the pre-doping of Zr in the precursor, a little fraction of Ti is also doped in the host during the coating process. This combines the advantages of Zr/Ti dual doping and Li+-conductor Li2TiO3 coating, which cooperatively enhances the rate capability, cycling stability and the poor low-temperature performances as well as mitigate the voltage decay. Neutron diffraction analysis indicates that the interslab spacing and the bond length of O-O and TM-O are enlarged which lowers the Li+ diffusion energy barrier and the repulsive interaction between Li-ions and TM cations, and facilitate Li+ diffusion and rate capability. The Li+/Ni2+ intermixing is also mitigated which further enhances Li+ diffusion and the layered structure stability. Furthermore, the tightly bound Li+-conducting Li2TiO3 layer not only avoids the electrode side reaction but also enhances the Li+ diffusivity. (C) 2019 The Electrochemical Society.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available