材料科学
石墨烯
阳极
压电
复合数
极化(电化学)
扩散
化学工程
分析化学(期刊)
复合材料
离子
电极
纳米技术
有机化学
物理化学
热力学
物理
工程类
化学
作者
Hongwei Mi,Yingtao Wang,Hao Chen,Lingna Sun,Xiangzhong Ren,Yongliang Li,Peixin Zhang
出处
期刊:Nano Energy
[Elsevier]
日期:2019-12-01
卷期号:66: 104136-104136
被引量:26
标识
DOI:10.1016/j.nanoen.2019.104136
摘要
Red phosphorus (red-P) has been studied intensively due to its high theoretical capacity. However, it remains a challenge to achieve outstanding rate performance because of a large ion radius of Na+ and insulation of red-P. Herein, BaTiO3 (BTO) is used as functional additive to promote Na+ diffusion based on piezoelectric effect induced by volume expansion of red-P. Micro red-Phosphorus/BaTiO3/Graphene (red-P/BTO/G) composite is prepared via a ball-milling method. After 100 cycles, the discharge capacity remains 823 mAh·g−1. The good performance of micro red-P/BTO/G composite is attributed to the enhanced diffusion kinetics brought by BTO, which makes the speed 110 times faster than red-P/G composite. Moreover, an increased diffusion rate has been acquired through polarization of BTO in high voltage electric field to get aligned polarization direction, with the speed 1.8 times of unpolarized red-P/BTO/G material. The mechanism how BTO promotes Na+ diffusion in discharge process is explained in detail.
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