当前位置: X-MOL 学术Joule › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Electrochemical Oscillation in Li-Ion Batteries
Joule ( IF 39.8 ) Pub Date : 2018-04-18 , DOI: 10.1016/j.joule.2018.03.014
De Li , Yang Sun , Zhenzhong Yang , Lin Gu , Yong Chen , Haoshen Zhou

Two-phase reactions are prevalent in Li-ion batteries, whereas the underlying dynamics of phase separation in a real electrode still remain elusive, since numerous electrode particles constitute a formidably complex system for existing experimental techniques. Here we present an intriguing oscillatory phenomenon in the typical phase-separating electrode material Li4Ti5O12. During galvanostatic processes, the voltage oscillates due to the discrete nature of multi-particle phase-separating reactions, and the subtle oscillatory signals allow us to evaluate the fraction of actively phase-separating particles in real time. Through the analysis of oscillatory phenomena, we unveil the dependence of the active fraction on the depth of charge/discharge, cycling current, and working temperature, considerably deepening our understanding of the multi-particle phase-separation reaction. Moreover, it is the first time that electrochemical oscillations have been identified in rechargeable battery systems, opening up a new frontier for both theoretical and experimental researchers.



中文翻译:

锂离子电池中的电化学振荡

锂离子电池中普遍存在两相反应,而实际电极中基本的相分离动力学仍然难以捉摸,因为许多电极颗粒构成了现有实验技术的极为复杂的系统。在此,我们介绍了典型的相分离电极材料Li 4 Ti 5 O 12中令人着迷的振荡现象。。在恒电流过程中,由于多粒子相分离反应的离散性质,电压振荡,并且微妙的振荡信号使我们能够实时评估有效相分离粒子的比例。通过分析振荡现象,我们揭示了活性成分对充电/放电深度,循环电流和工作温度的依赖性,从而极大地加深了我们对多颗粒相分离反应的理解。此外,这是首次在可充电电池系统中发现电化学振荡,这为理论和实验研究人员开辟了新的领域。

更新日期:2018-04-18
down
wechat
bug