K David Huang, Chen Po-Tuan, Yan Wei-Mon, Sangeetha Thangavel, Yang Cheng-Jung
Department of Vehicle Engineering, National Taipei University of Technology, Taipei 10608, Taiwan.
Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei, 10608, Taiwan.
Heliyon. 2024 May 4;10(10):e30471. doi: 10.1016/j.heliyon.2024.e30471. eCollection 2024 May 30.
Lithium-ion batteries are globally prominent and extensively employed alternative energy sources with decisive applications. In depth understanding of influences of various charging and discharging cycles on electrode materials and life span of these batteries is critical as cycle-life and safety of lithium-ion batteries are closely related crystallinity of electrode materials. This study is a detailed investigation endeavor in observing the degree of damage to electrode materials under multiple charging and discharging cycles.
ology: A constant current-sinusoidal reflex charging method (CC-Sinusoidal) was implemented to charge commercial cathode Lithium cobalt oxide (LiCoO) electrodes and anode graphite electrodes in comparison to the conventional charging method of constant current-constant voltage (CC-CV). After 100, 300, and 500 cycles of charging and discharging, EIS, SEM, XRD, and Raman spectroscopies were used to compare the degree of electrode damage caused by different charging methods.
The structure of positive LiCoO electrode of the battery was observed to be stable, with no significant change in both the charging methods after 500 cycles. The use of CC-CV charging method had caused severe damages to graphite electrode with generation of solid electrolyte interface (SEI) films. The CC-Sinusoidal charging method had maintained the electrode material in a relatively ideal state.
锂离子电池是全球范围内备受瞩目且广泛应用的替代能源，具有决定性的应用价值。深入了解各种充放电循环对电极材料及这些电池寿命的影响至关重要，因为锂离子电池的循环寿命和安全性与电极材料的结晶度密切相关。本研究是一项详细的调查工作，旨在观察在多次充放电循环下电极材料的损伤程度。
采用恒流 - 正弦波反射充电法（CC - 正弦波）对商用正极钴酸锂（LiCoO）电极和负极石墨电极进行充电，并与传统的恒流 - 恒压（CC - CV）充电方法进行比较。在进行100、300和500次充放电循环后，使用电化学阻抗谱（EIS）、扫描电子显微镜（SEM）、X射线衍射（XRD）和拉曼光谱来比较不同充电方法对电极造成的损伤程度。
观察到电池的正极LiCoO电极结构稳定，在500次循环后两种充电方法均无显著变化。使用CC - CV充电方法对石墨电极造成了严重损伤，并生成了固体电解质界面（SEI）膜。CC - 正弦波充电方法使电极材料保持在相对理想的状态。
