Origin of additional capacities in metal oxide lithium-ion battery electrodes
Origin of additional capacities in metal oxide lithium-ion battery electrodes
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DOI：
10.1038/nmat3784
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发表时间：
2013-12-01
期刊：
影响因子：
41.2
通讯作者：
Grey, Clare P.
中科院分区：
文献类型：
--
作者：
Hu, Yan-Yan;Liu, Zigeng;Grey, Clare P.
金属氟化物/氧化物(MFx/MxOy)是一种很有前途的锂离子电池电极。与插层反应相比，这些反应具有更高的能量密度。氟化物/氧化物还表现出比其理论容量更多的可逆容量，其机制仍然知之甚少，部分原因是很难表征纳米级的结构，特别是在埋藏的界面上。本研究采用高分辨率多核/多维固体核磁共振技术，结合原位同步加速器技术，对原型转化材料RuO2进行了研究。实验和理论计算表明，LiOH的生成及其与Li的可逆反应生成Li2O和LiH是该体系中额外容量的主要贡献。这项研究展示了一种研究该系统中形成的纳米结构的结构和空间邻近性的协议，包括生长在电池电极上的无定形固体电解质界面。
Metal fluorides/oxides (MFx/MxOy) are promising electrodes for lithium-ion batteries that operate through conversion reactions. These reactions are associated with much higher energy densities than intercalation reactions. The fluorides/oxides also exhibit additional reversible capacity beyond their theoretical capacity through mechanisms that are still poorly understood, in part owing to the difficulty in characterizing structure at the nanoscale, particularly at buried interfaces. This study employs high-resolution multinuclear/multidimensional solid-state NMR techniques, with in situ synchrotron-based techniques, to study the prototype conversion material RuO2. The experiments, together with theoretical calculations, show that a major contribution to the extra capacity in this system is due to the generation of LiOH and its subsequent reversible reaction with Li to form Li2O and LiH. The research demonstrates a protocol for studying the structure and spatial proximities of nanostructures formed in this system, including the amorphous solid electrolyte interphase that grows on battery electrodes.