Monodisperse multicore-shell SnSb@SnOx/SbOx@C nanoparticles space-confined in 3D porous carbon networks as high-performance anode for Li-ion and Na-ion batteries
Monodisperse multicore-shell SnSb@SnOx/SbOx@C nanoparticles space-confined in 3D porous carbon networks as high-performance anode for Li-ion and Na-ion batteries
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单分散多核壳 SnSb@SnOx/SbOx@C 纳米颗粒空间限制在 3D 多孔碳网络中作为锂离子和钠离子电池的高性能阳极
DOI：
10.1016/j.cej.2019.04.045
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发表时间：
2019
影响因子：
15.1
通讯作者：
Zhao Naiqin
中科院分区：
文献类型：
--
作者：
Wang Zhiyuan;Dong Kangze;Wang Dan;Chen Fang;Luo Shaohua;Liu Yanguo;He Chunnian;Shi Chunsheng;Zhao Naiqin
锡基材料作为锂离子电池（LIBs）和钠离子电池（SIBs）的高容量负极材料受到了广泛关注。但由于其固有的体积变化大、动力学迟钝，容量衰退严重。在此，我们提出了一种简单且可扩展的自组装NaCl模板辅助原位催化策略，用于制备单分散多核壳SnSb@SnOx/SbOx@C纳米颗粒（10-30 nm），这些纳米颗粒被限制在三维（3D）石墨烯类多孔碳网络中。在独特的纳米结构中，Sn和Sb的协同作用和多孔碳网络提供的丰富的自由空间有效地缓解了体积变化，无定形SnOx/SbOxshell增强了SnSb与碳的界面相互作用，促进了离子的扩散，石墨碳壳和具有高机械柔韧性的三维类石墨烯碳网络不仅抑制了SnSb的聚集和粉碎，同时也提高了电极的完整性和导电性。因此,纳米复合材料电极比容量高,优越的速度能力(337.3 mAh g−1和244.3 mAh g−1 5 g−1 LIBs和兄弟姐妹,分别),和良好的循环稳定性(能力保留93%后200周期在1 g−1 LIBs能力保留80%后500周期在2 同胞 g−1)。本工作为设计和制造具有强大界面相互作用的纳米复合材料提供了新的策略，用于电化学能量转换和存储。
Tin-based materials have attracted intensive attention as promising high-capacity anodes for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). However, they suffer from serious capacity fading owing to the inherent huge volume changes and sluggish kinetics. Herein, we propose a facile and scalable self-assembly NaCl template-assisted in situ catalytic strategy for preparing monodisperse multicore–shell SnSb@SnOx/SbOx@C nanoparticles (10–30 nm) space-confined in three-dimensional (3D) graphene-like porous carbon networks. In the unique nanostructure, the synergistic effect of Sn and Sb and abundant free space provided by porous carbon network effectively relieves the volume change, the amorphous SnOx/SbOxshell enhances the interface interaction between SnSb and carbon as well as facilitates ion diffusion, the graphitic carbon shells and the 3D graphene-like carbon network with high mechanical flexibility not only inhibits the aggregation and pulverization of SnSb, but also improves the integrity and conductivity of electrode. Thus, the nanocomposite electrode deliver a high specific capacity, superior rate capability (337.3 mAh g−1and 244.3 mAh g−1at 5 A g−1for LIBs and SIBs, respectively), and excellent cycling stability (capacity retention of 93% after 200 cycles at 1 A g−1for LIBs; capacity retention of 80% after 500 cycles at 2 A g−1for SIBs). This work provides new strategy for the design and fabrication of nanocomposite with robust interface interaction for electrochemical energy conversion and storage application.