材料科学
离子
电子
电极
化学物理
钝化
电化学
纳米技术
功率密度
储能
光电子学
解耦(概率)
工程物理
化学
功率(物理)
物理
热力学
工程类
物理化学
图层(电子)
有机化学
控制工程
量子力学
作者
Chia‐Chin Chen,Joachim Maier
出处
期刊:Nature Energy
[Springer Nature]
日期:2018-02-05
卷期号:3 (2): 102-108
被引量:87
标识
DOI:10.1038/s41560-017-0084-x
摘要
The requirements for rechargeable batteries place high demands on the electrodes. Efficient storage means accommodating both ions and electrons, not only in substantial amounts, but also with substantial velocities. The materials’ space could be largely extended by decoupling the roles of ions and electrons such that transport and accommodation of ions take place in one phase of a composite, and transport and accommodation of electrons in the other phase. Here we discuss this synergistic concept being equally applicable for positive and negative electrodes along with examples from the literature for Li-based and Ag-based cells. Not only does the concept have the potential to mitigate the trade-off between power density and energy density, it also enables a generalized view of bulk and interfacial storage as necessary for nanocrystals. It furthermore allows for testable predictions of heterogeneous storage in passivation layers, dependence of transfer resistance on the state of charge, or heterogeneous storage of hydrogen at appropriate contacts. We also present an outlook on constructing artificial mixed-conductor electrodes that have the potential to achieve both high energy density and high power density. Electrochemical storage is typically accompanied by simultaneous accommodation of ions and electrons. Here the authors discuss a concept of decoupling electron and ion storage and present their perspectives of constructing artificial mixed conductor electrodes to enhance storage ability.
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