Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6601785 | Electrochimica Acta | 2018 | 22 Pages |
Abstract
Three-dimensional (3D) delaminated-Ti3C2 (d-Ti3C2) 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-Ti3C2 framework. Remarkable improvement in the electrochemical performances as the lithium-ion batteries (LIBs) anode is achieved. Typically, the SnO2@C/d-Ti3C2 xerogel framework delivers a high initial capacity (1314â¯mAâ¯hâ¯gâ1) and a reversible specific capacity up to 520â¯mAâ¯hâ¯gâ1 after 1000 charge-discharge cycles at 1.0â¯Aâ¯gâ1. Furthermore, even at 10â¯Aâ¯gâ1, it still achieves a reversible specific capacity of 205.6â¯mAâ¯hâ¯gâ1, with a discharge capacity of 169â¯mAâ¯hâ¯gâ1 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-Ti3C2 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.
Related Topics
Physical Sciences and Engineering
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Chemical Engineering (General)
Authors
Heng Zhang, Peigen Zhang, Wei Zheng, Wubian Tian, Jian Chen, Yamei Zhang, ZhengMing Sun,