Title

Achieving high initial coulombic efficiency and low voltage dropping in Li-rich Mn-based cathode materials by Metal-Organic frameworks-derived coating

Publication Name

Journal of Power Sources

Abstract

Li-rich Mn-based oxides (LRMOs) are promising cathode materials for next-generation Li-ion batteries because of their high voltage, high capacity, and low cost. However, the low initial Coulombic efficiency (ICE), severe capacity fading and voltage dropping during cycling hinder their large-scale application of LRMOs. Hence, we propose a facile Metal-Organic Frameworks (MOF)-self-assembly coating strategy to modify LRMOs with Co O /C coating (LRMO@Co O /C). The Co O /C layer can alleviate the side-reaction between the electrolyte and cathode materials, and enhance both ion-diffusion and electrons-transportation speed throughout the surface of the electrode materials. In addition, the Co O /C layer suppresses the lattice oxygen release and improve structural stability of LRMOs during long-term cycling. Consequently, the LRMO@Co O /C cathode shows a high ICE of 91.5% and slow voltage dropping of only 2 mV/cycle at 0.2 C. After 300 cycles, it still delivers a high discharge capacity of 210.7 mAh·g at 0.5 C with a capacity retention of ~80%. This work provides a novel approach to achieve next-generation high-energy density cathode materials. x y x y x y x y x y −1

Open Access Status

This publication is not available as open access

Volume

499

Article Number

229967

Funding Number

JCYJ20190813172807127

Funding Sponsor

Shenzhen Fundamental Research Program

Share

COinS
 

Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.jpowsour.2021.229967