3D d-Ti3C2 xerogel framework decorated with core-shell SnO2@C for high-performance lithium-ion batteries
3D d-Ti3C2 xerogel framework decorated with core-shell SnO2@C for high-performance lithium-ion batteries
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DOI：
10.1016/j.electacta.2018.07.198
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发表时间：
2018-09
影响因子：
6.6
通讯作者：
Heng Zhang;Peigen Zhang;Zheng Wei;Tian Wubian;Jian Chen;Zhang Yamei;Zhengming Sun
中科院分区：
文献类型：
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作者：
Heng Zhang;Peigen Zhang;Zheng Wei;Tian Wubian;Jian Chen;Zhang Yamei;Zhengming Sun
通过apva辅助溶胶-凝胶法制备了三维（3D）分层ti3c2 （d-Ti3C2）纳米核壳修饰的静电凝胶骨架，通过一步水热法合成SnO2@C纳米颗粒，并将其包封在d-Ti3C2骨架中。作为锂离子电池的阳极，其电化学性能得到了显著改善。通常,SnO2@C / d-Ti3C2xerogel框架提供了一个高初始容量(1314马 h g−1)和一个可逆比容量520马 h g−1 1000年后充放电周期在1.0 g−1。此外，即使在10 A g−1时，它仍然可以实现205.6 mA h g−1的可逆比容量，放电容量为169 mA h g−1，经过1000次循环后的库仑效率为99.5%。这种优异的电化学性能归功于核壳SnO2@C与3D d- ti3c2导电网络之间的协同作用：(1)核壳结构抑制了Li插入/提取过程中sno2的粉碎，(2)互连的3D MXene框架为锂离子的快速扩散和快速电荷转移建立了良好的导电途径。
Three-dimensional (3D) delaminated-Ti3C2(d-Ti3C2) xerogel framework decorated with core-shell SnO2@C nanoparticles is constructedviaPVA-assisted sol-gel process, in which SnO2@C nanoparticles are synthesized by one-step hydrothermal route and then encapsulated into d-Ti3C2framework. Remarkable improvement in the electrochemical performances as the lithium-ion batteries (LIBs) anode is achieved. Typically, the SnO2@C/d-Ti3C2xerogel framework delivers a high initial capacity (1314 mA h g−1) and a reversible specific capacity up to 520 mA h g−1after 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−1and 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-Ti3C2conductive network: (i) the core-shell structure suppresses the pulverization of SnO2during 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.