Adiponitrile (C6H8N2): A New Bi-Functional Additive for High-Performance Li-Metal Batteries
- Title
- Adiponitrile (C6H8N2): A New Bi-Functional Additive for High-Performance Li-Metal Batteries
- Author
- 선양국
- Keywords
- bi-functional additives; fast charging; high-energy density; lithium-metal batteries; Ni-rich NCM cathodes
- Issue Date
- 2019-07
- Publisher
- WILEY-V C H VERLAG GMBH
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v. 29, no. 30, article no. 1902496
- Abstract
- Rechargeable batteries with a Li metal anode and Ni-rich Li[NixCoyMn1−x−y]O2 cathode (Li/Ni-rich NCM battery) have been emerging as promising energy storage devices because of their high-energy density. However, Li/Ni-rich NCM batteries have been plagued by the issue of the thermodynamic instability of the Li metal anode and aggressive surface chemistry of the Ni-rich cathode against electrolyte solution. In this study, a bi-functional additive, adiponitrile (C6H8N2), is proposed which can effectively stabilize both the Li metal anode and Nirich NCM cathode interfaces. In the Li/Ni-rich NCM battery, the addition of 1 wt% adiponitrile in 0.8 m LiTFSI + 0.2 M LiDFOB + 0.05 M LiPF6 dissolved in EMC/FEC = 3:1 electrolyte helps to produce a conductive and robust Li anode/ electrolyte interface, while strong coordination between Ni4+ on the delithiated Ni-rich cathode and nitrile group in adiponitrile reduces parasitic reactions between the electrolyte and Ni-rich cathode surface. Therefore, upon using 1 wt% adiponitrile, the Li/full concentration gradient Li[Ni0.73Co0.10Mn0.15Al0.02] O2 battery achieves an unprecedented cycle retention of 75% over 830 cycles under high-capacity loading of 1.8 mAh cm−2 and fast charge–discharge time of 2 h. This work marks an important step in the development of high-performance Li/Ni-rich NCM batteries with efficient electrolyte additives.
- URI
- https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201902496https://repository.hanyang.ac.kr/handle/20.500.11754/152082
- ISSN
- 1616-301X; 1616-3028
- DOI
- 10.1002/adfm.201902496
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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