Boosting interfacial kinetics in extremely fast rechargeable Li-ion batteries with linear carbonate-based, LiPF6-concentrated electrolyte
- Authors
- Lee, Hyuntae; An, Hyeongguk; Chang, Hongjun; Lee, Mingyu; Park, Seungsoo; Lee, Soyeon; Kang, Jiwoong; Byon, Seungwoo; Koo, Bonhyeop; Lee, Hochun; Lee, Yong Min; Moon, Janghyuk; Chae, Sujong; Lee, Hongkyung
- Issue Date
- Nov-2023
- Publisher
- Elsevier B.V.
- Keywords
- Desolvation; Fast charging; High concentration; Interfacial kinetics; Linear carbonates; Lithium-ion batteries
- Citation
- Energy Storage Materials, v.63
- Journal Title
- Energy Storage Materials
- Volume
- 63
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/69458
- DOI
- 10.1016/j.ensm.2023.102995
- ISSN
- 2405-8297
2405-8289
- Abstract
- Amidst the surging demand for battery-powered automobiles, it is crucial to tackle the safety risks of Li plating triggered by high cell polarization to achieve extremely fast charging (XFC) of Li-ion batteries. This study explores the impact of Li+ desolvation and solid-electrolyte interphase (SEI) chemistry on cell polarizations by utilizing linear carbonate (LC)-based, LiPF6-concentrated electrolytes (LPCEs). In the LC family, dimethyl carbonate (DMC) is thermodynamically preferred to facilitate desolvation kinetics, thereby lowering the charge-transfer barrier at the graphite anode. For effective graphite passivation and faster Li+ diffusion crossing the SEI, fluoroethylene carbonate (FEC) can help build up a thin and fluorinated SEI and reinforce the XFC cycling stability of graphite||NMC622 full cells (3.0 mAh cm−2; N/P ratio = 1.1), exhibiting 94.3% capacity retention over 500 cycles under a 10-min charging condition. The excellent XFC performance is practically validated using a 1.2-Ah pouch cell, demonstrating three times higher capacity retention over 200 cycles while suppressing Li plating-triggered cell swelling compared to conventional electrolytes. Unraveling the cell polarization governed by electrolyte chemistry provides valuable insights regarding future electrolyte designs for improving the XFC capabilities of Li-ion batteries. © 2023 Elsevier B.V.
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