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Li Intercalation into a β-MnO2 Grain Boundary.

James A Dawson¹, Isao Tanaka¹

¹Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan.

ACS Applied Materials & Interfaces

|March 27, 2015

Summary

Nanostructured manganese dioxide (MnO2) shows improved lithium intercalation. Grain boundaries with large tunnels enhance Li intercalation and migration, explaining the superior performance of nanostructured materials.

Keywords:

catalyst cathode material grain boundaries lithium battery supercapacitor

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Area of Science:

Materials Science
Electrochemistry
Computational Chemistry

Background:

Manganese dioxide (MnO2) is crucial for energy storage devices like Li-ion batteries.
Nanostructuring rutile (β-)MnO2 significantly enhances electrochemical properties compared to bulk.
The improved lithium intercalation in nanostructured MnO2 is not fully understood.

Purpose of the Study:

Investigate lithium intercalation and migration at β-MnO2 grain boundaries (GBs).
Understand the role of GB structure in electrochemical performance.
Correlate theoretical findings with experimental observations.

Main Methods:

Utilized state-of-the-art theoretical techniques.
Simulated Li intercalation and migration at the β-MnO2 Σ 5(210)/[001] grain boundary.
Analyzed the influence of tunnel structures on Li energetics.

Main Results:

Large tunnel structures in GBs promote Li intercalation (up to 3.83 eV).
Small, overcoordinated tunnel structures hinder Li intercalation.
GB tunnel size and shape significantly affect Li migration barriers (0.15–0.89 eV vs. 0.17 eV for bulk).

Conclusions:

Grain boundaries with large, open tunnel structures can enhance electrochemical performance.
GB structure is a key factor in the improved performance of nanostructured β-MnO2.
Theoretical insights provide a pathway for designing advanced energy storage materials.