3D d-Ti3C2 xerogel framework decorated with core-shell SnO2@C for high-performance lithium-ion batteries. (20th September 2018)

• Record Type: Journal Article
• Authors: Zhang, Heng; Zhang, Peigen; Zheng, Wei; Tian, Wubian; Chen, Jian; Zhang, Yamei; Sun, ZhengMing
• Is Part Of: Electrochimica acta. Volume 285(2018)
• Page Start: 94
• Page End: 102
• Publication Date: 2018-09-20
• Subjects: MXene -- Core-shell SnO2@C -- Hierarchical structure -- Lithium ion battery -- Long cycle life; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.07.198
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Three-dimensional (3D) delaminated-Ti3 C2 (d-Ti3 C2 ) xerogel framework decorated with core-shell SnO2 @C nanoparticles is constructed via PVA-assisted sol-gel process, in which SnO2 @C nanoparticles are synthesized by one-step hydrothermal route and then encapsulated into d-Ti3 C2 framework. Remarkable improvement in the electrochemical performances as the lithium-ion batteries (LIBs) anode is achieved. Typically, the SnO2 @C/d-Ti3 C2 xerogel framework delivers a high initial capacity (1314 mA h g −1 ) and a reversible specific capacity up to 520 mA h g −1 after 1000 charge-discharge cycles at 1.0 A g −1 . Furthermore, even at 10 A g −1, it still achieves a reversible specific capacity of 205.6 mA h g −1, with a discharge capacity of 169 mA h g −1 and a coulombic efficiency of 99.5% after 1000 cycles. Such excellent electrochemical performances are attributed to the synergistic effect between core-shell SnO2 @C and 3D d-Ti3 C2 conductive network: (i) the core-shell structure suppresses the pulverization of SnO2 during the Li insertion/extraction process, and (ii) the interconnected 3D MXene framework establishes a good conductive pathway for fast lithium ions diffusion and quick charge transfer.