Journal Published Online: 28 August 2023
Volume 12, Issue 1

Influence of Packing Density on Electrochemical Performance of Lignin

CODEN: MPCACD

Abstract

Bio-based carbonaceous materials such as lignin are taking up increasingly important roles in energy storage. However, the wide spectrum of molecular identity and structure of lignin lead to inconsistent structure, properties, and performance because of its source, extraction, and pretreatment processes. In this research, we investigate the effects of packing density on the electrochemical performance for lignin. Samples were synthesized using lignin as the electroactive material. Four distinct types of lignin, i.e., alkali lignin microparticles (MP), alkali lignin nanoparticles (NP), dealkaline lignin MP, and dealkaline lignin NP, were used in this study. They were studied through varying the packing density and its subsequent effects on the electrochemical performance. The scanning electron microscopy and Fourier-transform infrared spectrometry analysis were conducted to obtain morphology and chemical compositions. Cyclic voltammetry and cyclic charge discharge tests were conducted to evaluate the polarization resistance. The optimal packing density was found to be in the range of 0.35–0.50 g cm−3 for all samples. In the optimal packing density range, dealkaline lignin NP displayed the highest electrochemical performance with a maximum specific capacitance of 1,159 mF g−1, an energy density of 19.097 Wh kg−1, and a power density of 11.05 kW kg−1. The optimization of packing density would enable further development of lignin-containing energy storage devices such as supercapacitors.

Author Information

Velhal, Mrudul
Department of Materials Science and Engineering, College Station, TX, USA
Mehta, Siddhi
Department of Materials Science and Engineering, College Station, TX, USA
Arole, Kailash
Department of Materials Science and Engineering, College Station, TX, USA
Liang, Hong
J. Mike Walker Department of Mechanical Engineering, College Station, TX, USA
Pages: 19
Price: $25.00
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Stock #: MPC20220108
ISSN: 2379-1365
DOI: 10.1520/MPC20220108