Advancing Mn-Based Li-Ion Battery Cathodes via a Partially Cation-Disordered Zigzag-Type Li-Nb-Mn-O Framework

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Developing manganese (Mn)-based lithium-ion battery cathodes with high redox activity, stable cycling, and cost-effectiveness remains a significant challenge.
• Existing research has explored various Mn-based structures, but a gap exists between ordered and fully disordered materials.

Purpose of the Study:

• To develop a novel partially cation-disordered lithium niobium manganese oxide with a zigzag structure.
• To investigate the electrochemical performance and structural mechanisms of this new material.

Main Methods:

• Synthesis of a partially cation-disordered lithium niobium manganese oxide.
• Electrochemical testing to evaluate cycling stability and redox activity.
• Structural analysis to understand the underlying mechanisms.

Main Results:

• The partially disordered cathode effectively unlocks the redox activity of the zigzag lattice.
• The material demonstrates stable cycling performance.
• Partial disordering suppresses Mn(III) disproportionation and facilitates a disordered rock salt transformation.

Conclusions:

• Partial cation disordering is a key strategy to enhance redox activity in Mn-based cathodes.
• This approach can lead to new energy storage mechanisms for high-performance, cost-effective battery materials.