Controllable synthesis of SnO2@carbon hollow sphere based on bi-functional metallo-organic molecule for high-performance anode in Li-ion batteries
Controllable synthesis of SnO2@carbon hollow sphere based on bi-functional metallo-organic molecule for high-performance anode in Li-ion batteries
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基于双功能金属有机分子的SnO2@碳空心球的可控合成用于高性能锂离子电池负极
DOI：
10.1016/j.apsusc.2018.01.184
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发表时间：
2018
影响因子：
6.7
通讯作者：
Li Zhenghui
中科院分区：
文献类型：
--
作者：
Zhang Haiyan;Li Liuqing;Li Zhaopeng;Zhong Weihao;Liao Haiyang;Li Zhenghui
构建中空结构和纳米SnO 2颗粒是提高SnO 2基电极储锂性能的两种常用策略。但如何在碳空心球中可控地嵌入SnO 2仍然是一个挑战。本文通过一种新型金属有机化合物（三苯基氯化锡，Sn-Ph）在SiO2模板表面的受限Friedel-Crafts交联反应，合成了一种SnO2@carbon空心球。所制备的SnO2@carbon空心球具有10 nm大小的SnO 2颗粒嵌入在无定形碳壁中。此外，通过调节SiO2模板的尺寸，可以得到100、200和400 nm的SnO2@carbon空心球。当它们应用于锂离子电池时，碳结构可以作为屏障保护SnO 2颗粒免受粉化，空心存储电解液，10纳米的非常小的SnO 2颗粒缩短了锂离子的扩散距离。因此，SnO2 @碳空心球呈现出上级的电化学性能。首次放电和充电容量分别达到1378.5和507.3 mAh g− 1，100次循环后，其容量保持率为501.2 mAh g−1，表明容量保持率为98.8%（C100 th/C2 nd）。
Constructing hollow structure and nano-sized SnO2particles are two normal strategies to improve lithium storage performance of SnO2-based electrode. But it is still challengeable to fabricate ultrasmall SnO2embedded in carbon hollow sphere in a controllable way. Herein, we have synthesized a kind of SnO2@carbon hollow sphere via a confined Friedel-Crafts crosslinking of a novel metal-organic compound (triphenyltin chloride, named Sn-Ph) on the surface of SiO2template. The as-prepared SnO2@carbon hollow sphere has 10 nm-sized SnO2particles embedded in amorphous carbon wall. Furthermore, 100, 200 and 400 nm-sized SnO2@carbon hollow spheres can be obtained by regulating the size of SiO2template. When they are applied in lithium-ion batteries, the carbon structure can act as barriers to protect SnO2particles from pulverization, and hollow core stores electrolyte and very small SnO2particles of 10 nm shorten the diffusion distance of lithium ions. Thus, SnO2@carbon hollow sphere presents superior electrochemical performance. The first discharge and charge capacities reach 1378.5 and 507.3 mAh g−1respectively, and 100 cycles later, its capacity remains 501.2 mAh g−1, indicating a capacity retention of 98.8% (C100th/C2nd).