Building nanoparticle-stacking MoO2-CDs via in-situ carbon dots reduction as high-performance anode material for lithium ion and sodium ion batteries. (1st October 2019)

• Record Type: Journal Article
• Authors: Qing, Miaoqing; Meng, Yan; Wang, Yujue; Li, Xiaopeng; Zhou, Caixia; Liang, Yaming; Zhang, Zhaokun; Liu, Qilin; Guo, Yong; Xiao, Dan
• Is Part Of: Electrochimica acta. Volume 319(2019)
• Page Start: 740
• Page End: 752
• Publication Date: 2019-10-01
• Subjects: Molybdenum dioxide -- Carbon dots -- High rate performance -- Pseudocapacitance -- Lithium/Sodium ion battery; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.07.017
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: In this work, we report a new type anode material, MoO2 combined carbon dots (CDs) with nanoparticle-stacking structure via a facile hydrothermal route. Herein, CDs is introduced as the reductant which in-situ reduces Mo VI to Mo IV . It is further confirmed that the particles of MoO2 with evenly distributed beset of carbon dots form a nanoparticle-stacking structure. Thanks to this specific structure, the as-made MoO2 -CDs manifest high performance in lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). The capacities maintain 854 and 236 mAh g −1 at 0.50 A g −1 after 300 cycles for LIBs and 600 cycles for SIBs, respectively. Furthermore, we explored the structure-stability relationship by the electrochemical measurement and morphology, found the mechanisms of charge/discharge composed of dominant redox reaction and auxiliary intercalation reaction, and explained the characteristics of a high rate performance through kinetic issues and extrinsic pseudocapacitance contributions. This green synthetic method of anode material could make it possible to obtain high-performance alkali-ion batteries and other energy storage devices.