Examining Effects of Negative to Positive Capacity Ratio in Three-Electrode Lithium-Ion Cells with Layered Oxide Cathode and Si Anode
Examining Effects of Negative to Positive Capacity Ratio in Three-Electrode Lithium-Ion Cells with Layered Oxide Cathode and Si Anode
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DOI：
10.1021/acsaem.2c00665
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发表时间：
2022-05
影响因子：
6.4
通讯作者：
Mei Luo;Marco T. F. Rodrigues;L. Shaw;D. Abraham
中科院分区：
文献类型：
--
作者：
Mei Luo;Marco T. F. Rodrigues;L. Shaw;D. Abraham
负极与正极容量比（n：p）对于锂离子电池设计至关重要，因为它影响能量密度和长期性能。在这项研究中，then：pratio对电化学性能的影响进行了研究，为含有参比电极的NMC 532/Si电池。通过监测各个电极电位，可以确定阳极和阴极处的锂化/脱锂深度。highern：pcell的上级性能，包括更大的可逆性、更好的容量保持率和更低的阻抗上升，可以归因于电化学循环期间硅颗粒中较小的体积变化。
The negative to positive electrode capacity ratio (n:p) is crucial for lithium-ion cell design because it affects both energy density and long-term performance. In this study, the effect of then:pratio on electrochemical performance has been investigated for NMC532/Si cells containing a reference electrode. By monitoring individual electrode potentials, depths of lithiation/delithiation at the anode and cathode could be determined. The superior performance of the highern:pcell, including greater reversibility, better capacity retention, and lower impedance rise, can be attributed to smaller volume changes in the silicon particles during electrochemical cycling.