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Interfacial Mn Vacancy for Li-Rich Mn-Based Oxide Cathodes.

Youchen Hao¹, Xifei Li¹, Wen Liu¹

¹Shaanxi International Joint Research Centre of Surface Technology for Energy Storage Materials, Xi'an Key Laboratory of New Energy Materials and Devices, Institute of Advanced Electrochemical Energy, School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China.

ACS Applied Materials & Interfaces

|May 9, 2022

Summary

Introducing manganese vacancies into Prussian blue coatings and Li-rich manganese-based oxide (LMO) electrodes enhances battery performance. This strategy improves stability and boosts the activity of LMO, addressing key challenges in energy storage.

Keywords:

Li-rich Mn-based oxide Mn vacancy Prussian blue boosted activity prolonged lifespan

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Li-rich manganese-based oxide (LMO) cathode materials face challenges including oxygen release and high polarization at high rates.
Prussian blue (PB) is a potential coating material for LMO to mitigate these issues, but its stability is limited by the Jahn-Teller effect.

Purpose of the Study:

To enhance the stability and electrochemical performance of Li-rich manganese-based oxide (LMO) cathode materials.
To investigate the effect of manganese vacancies (M_V) on Prussian blue (PB) coatings and LMO itself.

Main Methods:

Introduction of manganese vacancies into the Prussian blue (PB) coating layer (M_V-PB@LMO).
Fabrication and electrochemical testing of electrodes with M_V-PB@LMO and M_V@LMO (manganese vacancy in LMO).

Main Results:

The M_V-PB@LMO electrode demonstrated a prolonged lifespan compared to electrodes with pristine PB coatings.
The M_V@LMO electrode exhibited superior reversibility and boosted activity.
Manganese vacancies significantly enhance the stability and electrochemical performance of LMO-based batteries.

Conclusions:

Manganese vacancies are a promising strategy to improve the stability and performance of Li-rich manganese-based oxide (LMO) cathode materials.
Further research should focus on strengthening the intrinsic stability of M_V@LMO for advanced energy storage applications.