期刊
JOURNAL OF POWER SOURCES
卷 580, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2023.233447
关键词
Lithium-ion batteries; LiCoO2; Electrolyte additive; Cathode/electrolyte interphase; Functional mechanism
Film-forming electrolyte additives have a significant impact on the interfacial chemistries and practical performances of LiCoO2-based lithium-ion batteries. In this study, the effects of four typical additives, including vinylene carbonate (VC), 1,3-propane sultone (PS), fluoroethylene carbonate (FEC), and adiponitrile (ADN), on the discharge capacities and stabilities of LiCoO2-based batteries at different temperatures were evaluated. The results reveal that these additives can influence the performance of the batteries by adjusting the morphologies and protection effects of the cathode/electrolyte interphase (CEI) films.
Film-forming electrolyte additives are widely used for optimizing cathode/electrolyte interphase (CEI) films of LiCoO2-based lithium-ion batteries. Nevertheless, the effects of the four typical additives with different elements including vinylene carbonate (VC), 1,3-propane sultone (PS), fluoroethylene carbonate (FEC), and adiponitrile (ADN) on interfacial chemistries of LiCoO2 cathode and practical performances of LiCoO2-based batteries at various temperatures are still unclear. Herein, the four additives are evaluated for a LiCoO2/artificial graphite pouch cell at 3-4.5 V. It is found that the additives significantly affect the discharge capacities of the cells at-20 degrees C and various rates, and stabilities when stored at 60 degrees C and cycled at room temperature. Among them, the FEC-containing cell exhibits the most outstanding performance while PS has a low positive effect on almost all properties. VC enables good kinetic abilities when ADN can improve stability. Combined with physical char-acterizations and theoretical calculation, the functional mechanisms of the additives on LiCoO2 cathode are understudied. Results demonstrate that the additives dictate CEI films possessing specific elements through oxygenolysis, surface adsorption or passivation, then adjust the morphologies and protection effects of CEI films. These findings can provide important information for fundamental exploration and engineering design of high -voltage LiCoO2-based batteries.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据