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Core–shell structured MnSiO3 supported with CNTs as a high capacity anode for lithium-ion batteries
Dalton Transactions ( IF 4 ) Pub Date : 2018-03-20 00:00:00 , DOI: 10.1039/c7dt04886f
Jing Feng 1, 2, 3, 4, 5 , Qin Li 1, 2, 3, 4, 5 , Huijun Wang 1, 2, 3, 4, 5 , Min Zhang 1, 2, 3, 4, 5 , Xia Yang 1, 2, 3, 4, 5 , Ruo Yuan 1, 2, 3, 4, 5 , Yaqin Chai 1, 2, 3, 4, 5
Affiliation  

Metal silicates are good candidates for use in lithium ion batteries (LIBs), however, their electrochemical performance is hindered by their poor electrical conductivity and volume expansion during Li+ insertion/desertion. In this work, one-dimensional core–shell structured MnSiO3 supported with carbon nanotubes (CNTs) (referred to as CNT@MnSiO3) with good conductivity and electrochemical performance has been successfully synthesized using a solvothermal process under moderate conditions. In contrast to traditional composites of CNTs and nanoparticles, the CNT@MnSiO3 composite in this work is made up of CNTs with a layer of MnSiO3 on the surface. The one-dimensional CNT@MnSiO3 nanotubes provide a useful channel for transferring Li+ ions during the discharge/charge process, which accelerates the Li+ diffusion speed. The CNTs inside the structure not only enhance the conductivity of the composite, but also prevent volume expansion. A high reversible capacity (920 mA h g−1 at 500 mA g−1 over 650 cycles) and good rate performance were obtained for CNT@MnSiO3, showing that this strategy of synthesizing coaxial CNT@MnSiO3 nanotubes offers a promising method for preparing other silicates for LIBs or other applications.

中文翻译:

碳纳米管支撑 的核壳结构MnSiO 3作为锂离子电池的高容量阳极

金属硅酸盐是用于锂离子电池(LIB)的很好的候选材料,但是,由于其差的电导率和在Li +插入/放电过程中的体积膨胀,它们的电化学性能受到阻碍。在这项工作中,一维核-壳结构MnSiO 3支持与碳纳米管(CNT)(简称为CNT @ MnSiO 3)具有良好的导电性和电化学性能使用在温和条件下由溶剂热过程已成功合成。与传统的CNT和纳米颗粒复合材料相比,这项工作中的CNT @ MnSiO 3复合材料由在表面具有MnSiO 3层的CNT组成。一维CNT @ MnSiO 3纳米管提供了在放电/充电过程中转移Li +离子的有用通道,从而加快了Li +扩散速度。结构内部的CNT不仅增强了复合材料的导电性,而且还防止了体积膨胀。高的可逆容量(920毫安汞柱-1以500mA克-1获得超过650个周期)和良好的倍率性能为CNT @ MnSiO 3,示出了合成同轴CNT @ MnSiO的这种策略3个纳米管提供了一种制备有前途的方法用于LIB或其他应用的其他硅酸盐。
更新日期:2018-03-20
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