Understanding the Orderliness of Atomic Arrangement toward Enhanced Sodium Storage
Understanding the Orderliness of Atomic Arrangement toward Enhanced Sodium Storage
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DOI：
10.1002/aenm.201600448
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发表时间：
2016-12
影响因子：
27.8
通讯作者：
Minghong Zhou;Yang Xu;Junxiang Xiang;Chengliang Wang;Liying Liang;Liaoyong Wen;Yaoguo Fang;Y. Mi;Y. Lei
中科院分区：
文献类型：
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作者：
Minghong Zhou;Yang Xu;Junxiang Xiang;Chengliang Wang;Liying Liang;Liaoyong Wen;Yaoguo Fang;Y. Mi;Y. Lei
为了响应对可用能量存储的增加的需求，钠离子电池（SIB）似乎是广泛使用的锂离子电池的有前途的替代品。然而，由于Na离子的大半径，对固有性质的更复杂的要求增加了寻找合适材料的困难，特别是对于具有嵌入机制的电极。关于设计有效电极的原则，原子排列的有序化应该是SIB的核心，因为它对各种电化学过程（例如离子吸收、离子扩散、电子扩散等）有显著影响。通过低温原子层辅助的胶体晶体模板法获得了具有不同原子排列有序性的现有技术的TiO 2电极沉积和后加热处理。表面的无序有利于表面过程的贡献，这对于输运离子亲和力较差的电极材料尤为重要。同时，体相无序化有利于离子扩散，但不利于电子输运。理解原子有序性和电池性能之间的这种关系对于将设计原理扩展到一些传统电极以实现高效能量存储具有重要意义。
In response to the increased demands of available energy storage, sodium ion batteries (SIBs) appear as promising alternatives to widely used lithium ion batteries. However, because of large radius of Na ions, more complex requirements for the intrinsic properties raise the difficulties in finding a suitable material, in particularly for electrodes with intercalation mechanism. Concerning the principle of designing effective electrodes, the ordering of atomic arrangements should be at the heart in SIBs due to its significant influences on various electrochemical processes, such as ion absorption, ion diffusion, electron diffusion, etc. As proof‐of‐concept, the state‐of‐the art TiO2 electrodes with different orderliness of atomic arrangement are achieved through colloidal crystal template method assisted by low‐temperature atomic layer deposition and post‐heating treatment. The disordering at the surface is benefit for the contribution from surface processes, which is particularly significant to the electrode materials with poorer affinity of transporting ions. Meanwhile, the disordering in bulk results in better ion diffusion, but worse electron transport. Understanding this relationship between atomic orderliness and battery performance is of importance for extending the design principle to some traditional electrodes for highly effective energy storage.