Hollow Iron Oxide Nanoparticles for Application in Lithium Ion Batteries
Hollow Iron Oxide Nanoparticles for Application in Lithium Ion Batteries
复制标题
DOI：
10.1021/nl3004286
复制
发表时间：
2012-05-01
期刊：
影响因子：
10.8
通讯作者：
Shevchenko, Elena V.
中科院分区：
文献类型：
--
作者：
Koo, Bonil;Xiong, Hui;Shevchenko, Elena V.
除了固体纳米颗粒之外，根据其形态进行材料设计可以产生更先进的性能。以氧化铁为例，探讨了空心纳米粒子作为阴极和阳极的电化学性能。此类纳米颗粒含有非常高浓度的阳离子空位，可以有效地用于可逆的锂离子嵌入而不发生结构变化。在高电压范围内循环导致高容量（类似于2.5 V时的132 mAh/g）、99.7%库仑效率、优异的上级倍率性能（3000 mA/g时的133 mAh/g）和优异的稳定性（在超过500次循环期间在快速倍率下没有衰减）。空心氧化铁纳米颗粒中的阳离子空位也被发现是负责在转换反应中的增强容量。我们通过同步辐射X射线吸收和衍射技术监测了空心氧化铁纳米颗粒的原位结构转变，这为我们提供了电化学循环过程中嵌锂过程的清晰理解。
Material design in terms of their morphologies other than solid nanoparticles can lead to more advanced properties. At the example of iron oxide, we explored the electrochemical properties of hollow nanoparticles with an application as a cathode and anode. Such nanoparticles contain very high concentration of cation vacancies that can be efficiently utilized for reversible Li ion intercalation without structural change. Cycling in high voltage range results in high capacity (similar to 132 mAh/g at 2.5 V), 99.7% Coulombic efficiency, superior rate performance (133 mAh/g at 3000 mA/g) and excellent stability (no fading at fast rate during more than 500 cycles). Cation vacancies in hollow iron oxide nanoparticles are also found to be responsible for the enhanced capacity in the conversion reactions. We monitored in situ structural transformation of hollow iron oxide nanoparticles by synchrotron X-ray absorption and diffraction techniques that provided us clear understanding of the lithium intercalation processes during electrochemical cycling.