SnO2/Sn Nanoparticles Embedded in an Ordered, Porous Carbon Framework for High-Performance Lithium-Ion Battery Anodes
SnO2/Sn Nanoparticles Embedded in an Ordered, Porous Carbon Framework for High-Performance Lithium-Ion Battery Anodes
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嵌入有序多孔碳框架中的 SnO2/Sn 纳米颗粒用于高性能锂离子电池阳极
DOI：
10.1002/celc.201600594
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发表时间：
2017
期刊：
影响因子：
4
通讯作者：
Li Xing
中科院分区：
文献类型：
--
作者：
Wang Zhi-Qiang;Wang Ming-Shan;Yang Zhen-Liang;Bai Yong-Shun;Ma Yan;Wang Guo-Liang;Huang Yun;Li Xing
二氧化锡（SnO 2）被认为是锂离子电池最有前途的负极材料之一。然而，纯SnO 2阳极在Li+插入/提取过程中的大体积变化不可避免地导致容量快速衰减。本文报道了以三嵌段共聚物Pluronic F-127为模板剂，通过简单的一步水热法制备微米级多孔SnO 2/Sn/C（p-SnO 2/Sn/C）复合材料，并随后进行碳化。在这种复合结构中，SnO 2/Sn纳米颗粒（约5 nm）均匀地嵌入有序多孔碳基体中，形成互穿的框架结构。 有序的多孔碳基质不仅为循环过程中Li+的提取/插入提供了三维通道，而且还缓冲了SnO 2/Sn纳米颗粒的严重体积变化。此外，与孤立的SnO 2/Sn纳米颗粒相比，该复合结构还确保形成稳定的固体电解质界面膜，这有效地提高了活性材料的电化学稳定性。因此，p-SnO 2/Sn/C阳极在100mA g− 1下100次循环后可提供1016.2mAh g− 1的高可逆容量，并具有显著的长期循环稳定性（即使在1000 mA g−1下600次循环后，充电容量仍为710 mAh g − 1）。
Tin dioxide (SnO2) is recognized as one of the most promising anode materials for lithium‐ion batteries. However, the large volume changes of pure SnO2anodes during Li+insertion/extraction inevitably result in rapid capacity decay. Herein, the fabrication of microsized, porous SnO2/Sn/carbon (p‐SnO2/Sn/C) composites by a straightforward one‐step hydrothermal process with triblock copolymer Pluronic F‐127 as templating agent and subsequent carbonization is reported. In this composite structure, SnO2/Sn nanoparticles (≈5 nm) are uniformly embedded in an ordered porous carbon matrix to form an interpenetrating framework structure. The ordered porous carbon matrix not only offers three‐dimensional channels for extraction/insertion of Li+during cycling, but also buffers severe volume changes of the SnO2/Sn nanoparticles. Furthermore, the composite structure also ensures formation of stable solid electrolyte interface films as compared with isolated SnO2/Sn nanoparticles, which efficiently improves the electrochemical stability of the active materials. Thus, the p‐SnO2/Sn/C anode delivers a high reversible capacity of 1016.2 mAh g−1at 100 mA g−1after 100 cycles and has remarkable long‐term cycle stability (a charge capacity of 710 mAh g−1even after 600 cycles at 1000 mA g−1).