Synthesis of Chl@Ti_(3)C_(2) composites as an anode material for lithium storage  

作　　者：Wenxin Xu Xin Zhao Jiali Tang Chao Zhang Yu Gao Shin-ichi Sasaki Hitoshi Tamiaki Aijun Li Xiao-Feng Wang 

机构地区：[1]Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education),College of Physics,Jilin University,Changchun 130012,China [2]Graduate School of Life Sciences,Ritsumeikan University,Shiga 525-8577,Japan [3]Nagahama Institute of Bio-Science and Technology,Shiga 526-0829,Japan

出　　处：《Frontiers of Chemical Science and Engineering》2021年第3期709-716,共8页化学科学与工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11974129)to Xiao-Feng Wang;the Fundamental Research Funds for the Central Universities,Jilin University,the Science and Technology Development Plan of Jilin Province(Grant Nos.20180414010GH,20190201133JC);Japan Society for the Promotion of Science(JSPS)KAKENHI(Grant No.JP17H06436)to Hitoshi Tamiaki.

摘　　要：Two-dimensional(2D)titanium carbide MXene Ti_(3)C_(2) has attracted significant research interest in energy storage applications.In this study,we prepared Chl@Ti_(3)C_(2) composites by simply mixing a chlorophyll derivative(e.g.,zinc methyl 3-devinyl-3-hydroxymethylpyropheophorbide a(Chl))and Ti_(3)C_(2) in tetrahydrofuran,where the Chl molecules were aggregated among the multi-layered Ti_(3)C_(2) MXene or on its surface,increasing the interlayer space of Ti_(3)C_(2).The as-prepared Chl@Ti_(3)C_(2) 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_(3)C_(2),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_(3)C_(2) accompanied by the electrochemical reactions.The discharge capacity of 1 wt-%Chl@Ti_(3)C_(2) was recorded to be 325 mA·h·g^(-1) at the current density of 50 mA·g^(-1) with a Coulombic efficiency of 56% and a reversible discharge capacity of 173 mA·h·g^(-1) at the current density of 500 mA·g^(-1) 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.

关 键 词：zinc chlorin aggregate Ti_(3)C_(2)MXene anode material lithium storage 

分 类 号：TB33[一般工业技术—材料科学与工程]