RESEARCH ARTICLE
. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, China.. Graduate School of Life Sciences, Ritsumeikan University, Shiga 525-8577, Japan.. Nagahama Institute of Bio-Science and Technology, Shiga 526-0829, Japan
Received: 2020-09-16
Accepted: 2020-11-19
Available online: 2020-11-19
Abstract
Two-dimensional (2D) titanium carbide MXene Ti C has attracted significant research interest in energy storage applications. In this study, we prepared Chl@Ti C composites by simply mixing a chlorophyll derivative (e.g., zinc methyl 3-devinyl-3-hydroxymethyl- pyropheophorbide (Chl)) and Ti C in tetrahydrofuran, where the Chl molecules were aggregated among the multi-layered Ti C MXene or on its surface, increasing the interlayer space of Ti C . The as-prepared Chl@Ti C was employed as the anode material in the lithium-ion battery (LIB) with lithium metal as the cathode. The resulting LIB exhibited a higher reversible capacity and longer cycle performance than those of LIB based on pure Ti C , and its specific discharge capacity continuously increased along with the increasing number of cycles, which can be attributed to the gradual activation of Chl@Ti C accompanied by the electrochemical reactions. The discharge capacity of 1 wt-% Chl@Ti C was recorded to be 325 mA·h·g at the current density of 50 mA·g with a Coulombic efficiency of 56% and a reversible discharge capacity of 173 mA·h·g at the current density of 500 mA·g after 800 cycles. This work provides a novel strategy for improving the energy storage performance of 2D MXene materials by expanding the layer distance with organic dye aggregates.
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