Facile synthesis of hollow Ti2Nb10O29 microspheres for high-rate anode of Li-ion batteries
Facile synthesis of hollow Ti2Nb10O29 microspheres for high-rate anode of Li-ion batteries
复制标题
轻松合成用于锂离子电池高倍率负极的空心 Ti2Nb10O29 微球
DOI：
10.1007/s11426-017-9201-y
复制
发表时间：
2018-06-01
影响因子：
9.6
通讯作者：
Wan, Li-Jun
中科院分区：
文献类型：
--
作者：
Sun, Yong-Gang;Sun, Tian-Qi;Wan, Li-Jun
钛铌氧化物是一种具有潜在应用前景的锂离子电池负极材料，具有高安全性和高能量密度。然而，这种复合氧化物固有的低电子导电性严重限制了其实际容量，这成为一个严重的问题，特别是当期望高速率充电/放电能力时。在这里，使用一个修改的模板辅助合成协议，其特点是在原位截留的钛和铌物种的聚合物微球的形成过程中，随后通过热解过程中，我们成功地制备钛铌氧化物的中空微球，具有高效率的结构控制。当用作阳极材料时，结构控制的中空样品提供高可逆容量（50 C下103.7 mA h g−1）和非凡的循环能力，特别是在高充电/放电电流下（10 C下500次循环后164.7 mA h g−1）。
Titanium niobium oxides emerge as promising anode materials with potential for applications in lithium ion batteries with high safety and high energy density. However, the innate low electronic conductivity of such a composite oxide seriously limits its practical capacity, which becomes a serious concern especially when a high rate charge/discharge capability is expected. Here, using a modified template-assisted synthesis protocol, which features an in-situ entrapment of both titanium and niobium species during the formation of polymeric microsphere followed by a pyrolysis process, we succeed in preparing hollow microspheres of titanium niobium oxide with high efficiency in structural control. When used as an anode material, the structurally-controlled hollow sample delivers high reversible capacity (103.7 mA h g−1 at 50 C) and extraordinary cycling capability especially at high charge/discharge currents (164.7 mA h g−1 after 500 cycles at 10 C).