Elucidation of the influence of operating temperature in LiNi0.8Co0.15Al0.05O2/silicon and LiNi0.8Co0.15Al0.05O2/graphite pouch cells batteries cycle-life degradation

阳极 材料科学 介电谱 石墨 重量分析 阴极 化学工程 降级(电信) 电化学 电气工程 光电子学 化学 复合材料 电极 有机化学 物理化学 工程类
作者
Filippos Farmakis,Iratxe de Meatza,T. Subburaj,D. Tsiplakides,D.-P. Argyropoulos,Stella Balomenou,Imanol Landa‐Medrano,Aitor Eguía-Barrio,Nikoleta Strataki,Maria Nestoridi
出处
期刊:Journal of energy storage [Elsevier BV]
卷期号:41: 102989-102989 被引量:8
标识
DOI:10.1016/j.est.2021.102989
摘要

The necessity for lighter and smaller energy storage systems drives the technological limits to electrochemical systems that offer higher gravimetric and volumetric energy density. Toward this trend, silicon as anode material provides a great potential due to the high specific capacity but lacks stability over extensive cycling. In this paper, we present a comparative study between LiNi0.8Co0.15Al0.05O2/silicon and LiNi0.8Co0.15Al0.05O2/graphite pouch cells with the aid of electrochemical impedance spectroscopy (EIS). The two pouch cell systems were manufactured and underwent galvanostatic cycling at 5, 25 and 35 °C, monitoring cell capacity and impedance. The results demonstrated, as expected, that capacity fade in silicon-anode pouch cells is faster than with graphite-anode at all temperatures. However, silicon-anode pouch cells are able to perform more than 120 cycles at C/10 charge and C/2 discharge rates before losing 20% of their initial capacity at 5 and 25 °C. At these temperatures, the decay of the capacity is mostly attributed to the degradation of the silicon anode. By combining EIS spectra, differential voltage and post-mortem analysis, it is suggested that when the silicon-based cells are cycled, anode degradation contributes to NCA cathode damage due to the overvoltage. Therefore, we suggest that besides the silicon degradation, the NCA cathode plays also a role in the cycling lifetime of the silicon-based cells.
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