当前位置：
X-MOL 学术
›
ACS Mater. Lett.
›
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.)
Correlating the Peukert’s Constant with Phase Composition of Electrode Materials in Fast Lithiation Processes
ACS Materials Letters ( IF 9.6 ) Pub Date : 2019-10-09 , DOI: 10.1021/acsmaterialslett.9b00320 Yanyan Zhang 1 , Yuxin Tang 2 , Jiyang Deng 1 , Wan Ru Leow 1 , Huarong Xia 1 , Zhiqiang Zhu 1 , Zhisheng Lv 1 , Jiaqi Wei 1 , Wenlong Li 1 , Clas Persson 3 , Oleksandr I. Malyi 3 , Markus Antonietti 4 , Xiaodong Chen 1
ACS Materials Letters ( IF 9.6 ) Pub Date : 2019-10-09 , DOI: 10.1021/acsmaterialslett.9b00320 Yanyan Zhang 1 , Yuxin Tang 2 , Jiyang Deng 1 , Wan Ru Leow 1 , Huarong Xia 1 , Zhiqiang Zhu 1 , Zhisheng Lv 1 , Jiaqi Wei 1 , Wenlong Li 1 , Clas Persson 3 , Oleksandr I. Malyi 3 , Markus Antonietti 4 , Xiaodong Chen 1
Affiliation
|
The electrochemical performance of energy storage devices decreasing with the increase of charging/discharging rates is described as the Peukert’s effect. To minimize this effect, the reduction of the Peukert’s constant towards the ideal value of 1.0 is needed. Herein, for the first time, we reveal a correlation between the Peukert’s constant and the phase composition of electrode materials in lithium-ion batteries (LIBs). As a proof-of-concept, a parabola-like correlation is observed in the anatase/TiO2(B) electrode with a significant reduction in the Peukert’s constant from 2.15 to 1.20, when the content of anatase phase increases from 0% to 22%. This corresponds to a capacity enhancement of about three times from 42.2 to 131.5 mAh g–1 at a current density of 12.0 A g–1. The boosted charge-transfer kinetics in the composite electrode, relative to that of the single component electrode, is the cause for the reduction in the Peukert’s constant. Theoretical calculations well support the cooperative effect of maximizing both electronic conductivity and Li-ion diffusivity in the composite electrode. Our present findings provide a new way for reducing the Peukert’s constant in LIBs via manipulating the materials composition, which constitutes a generalized solution towards the improved rate-performance in electrochemical reactions.
中文翻译：
快速锂化过程中将Peukert常数与电极材料的相组成相关
能量存储设备的电化学性能随充电/放电速率的增加而降低，被描述为Peukert效应。为了使这种影响最小化，需要将Peukert常数减小到理想值1.0。本文中，我们首次揭示了Peukert常数与锂离子电池（LIB）中电极材料的相组成之间的相关性。作为概念验证，在锐钛矿相/ TiO 2（B）电极中，锐钛矿相的含量从0％增加到22时，Peukert常数从2.15显着降低到1.20，具有类似抛物线的相关性。％。这对应于在电流密度为12.0 A g –1的情况下从42.2到131.5 mAh g –1约三倍的容量增强。相对于单组分电极，复合电极中增强的电荷转移动力学是Peukert常数降低的原因。理论计算很好地支持了最大化复合电极中电子电导率和锂离子扩散率的协同效应。我们目前的发现提供了一种通过控制材料成分来降低LIBs的Peukert常数的新方法，这构成了朝着提高电化学反应速率性能的通用解决方案。
更新日期：2019-10-25
中文翻译：
快速锂化过程中将Peukert常数与电极材料的相组成相关
能量存储设备的电化学性能随充电/放电速率的增加而降低，被描述为Peukert效应。为了使这种影响最小化，需要将Peukert常数减小到理想值1.0。本文中，我们首次揭示了Peukert常数与锂离子电池（LIB）中电极材料的相组成之间的相关性。作为概念验证，在锐钛矿相/ TiO 2（B）电极中，锐钛矿相的含量从0％增加到22时，Peukert常数从2.15显着降低到1.20，具有类似抛物线的相关性。％。这对应于在电流密度为12.0 A g –1的情况下从42.2到131.5 mAh g –1约三倍的容量增强。相对于单组分电极，复合电极中增强的电荷转移动力学是Peukert常数降低的原因。理论计算很好地支持了最大化复合电极中电子电导率和锂离子扩散率的协同效应。我们目前的发现提供了一种通过控制材料成分来降低LIBs的Peukert常数的新方法，这构成了朝着提高电化学反应速率性能的通用解决方案。
京公网安备 11010802027423号