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Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery

Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery

Published on: July 12, 2016

Ordered mesoporous carbon electrodes for Li-O2 batteries.

Jin-Bum Park¹, Jinwoo Lee, Chong Seung Yoon

¹Department of Energy Engineering and §Department of Materials Science and Engineering, Hanyang University , Seoul 133-791, Republic of Korea.

ACS Applied Materials & Interfaces

|November 19, 2013

Summary

Ordered mesoporous carbon (OMC) electrodes significantly improve lithium-oxygen battery performance by reducing overpotential and enabling amorphous lithium peroxide formation within their pores. These advanced carbon materials demonstrate effectiveness even at high current densities.

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Area of Science:

Electrochemistry
Materials Science
Energy Storage

Background:

Lithium-oxygen (Li-O2) batteries offer high theoretical energy density but suffer from poor cyclability and high overpotentials.
Electrode materials play a critical role in mitigating parasitic reactions and improving Li-O2 battery performance.
Ordered mesoporous carbon (OMC) presents a promising scaffold due to its controlled pore structure and high surface area.

Purpose of the Study:

To investigate the impact of pore channel size in ordered mesoporous carbon (OMC) on the performance of Li-O2 battery electrodes.
To compare the electrochemical behavior of OMC electrodes with conventional Super P carbon electrodes.
To elucidate the role of OMC pore structure in the deposition of discharge products.

Main Methods:

Synthesis of OMCs with distinct pore sizes (6 nm and 17 nm).
Fabrication of Li-O2 battery cells using OMC and Super P as oxygen-side electrodes.
Electrochemical cycling at various current densities (200, 500, and 1000 mA g(-1)carbon).
Characterization of discharged electrodes using X-ray diffraction (XRD) and transmission electron microscopy (TEM).

Main Results:

OMC electrodes exhibited a 0.1 V reduction in oxygen evolution reaction polarization compared to Super P electrodes at 200 mA g(-1)carbon.
XRD and TEM analysis revealed amorphous lithium peroxide (Li2O2) formation within the OMC pores, unlike surface deposition on Super P.
OMC electrodes maintained effectiveness at higher current densities (500 and 1000 mA g(-1)carbon).

Conclusions:

The ordered pore structure of OMCs facilitates efficient Li-O2 battery operation by reducing polarization.
Confining Li2O2 formation within the OMC pores enhances electrode performance and potentially improves cyclability.
OMCs are superior oxygen-side electrode materials for Li-O2 batteries, especially under demanding current conditions.