Interface-Induced Pseudocapacitance in Nonporous Heterogeneous Particles for High Volumetric Sodium Storage
Interface-Induced Pseudocapacitance in Nonporous Heterogeneous Particles for High Volumetric Sodium Storage
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DOI：
10.1002/adfm.202002019
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发表时间：
2020-08-20
影响因子：
19
通讯作者：
Wu, Hao Bin
中科院分区：
文献类型：
--
作者：
Zhao, Bo;Liu, Qianqian;Wu, Hao Bin
开发用于电化学能量存储的赝电容材料通常依赖于具有短固态扩散距离和高表面积的纳米尺寸和/或纳米多孔颗粒的形成，这导致低体积容量和严重的寄生反应。在这项工作中，无孔大块异质粒子组成的TiO（2）基质和磷的高容量赝电容钠存储的报告。原位形成的3D磷酸钛中间相作为快速离子传输网络，允许颗粒内的快速钠化/去钠化过程。这种无孔的异质颗粒表现出“界面诱导的赝电容”与增强的体积容量，这是超过50%高于商业硬碳阳极。这项研究证明了具有良好工程纳米结构的异质颗粒作为电极材料设计的新范例。
Developing pseudocapacitive materials for electrochemical energy storage generally relies on the formation of nanosize and/or nanoporous particles with short solid-state diffusion distance and high surface area, which leads to low volumetric capacity and severe parasitic reactions. In this work, nonporous bulky heterogeneous particles composed of TiO(2)matrix and phosphorus are reported for high volumetric pseudocapacitive Na storage. An in situ formed 3D titanium phosphate interphase serves as a fast ionic transport network, allowing rapid sodiation/desodiation processes within the particles. Such nonporous heterogeneous particles exhibit "interface-induced pseudocapacitance" with an enhanced volumetric capacity, which is over 50% higher than that of commercial hard carbon anodes. This study demonstrates heterogeneous particles with a well-engineered nanostructure as a new paradigm for electrode materials design.