Dopamine as a Novel Electrolyte Additive for High-Voltage Lithium-Ion Batteries
- Authors
- Lee, Hoogil; Han, Taeyeong; Cho, Kuk Young; Ryou, Myung-Hyun; Lee, Yong Min
- Issue Date
- Aug-2016
- Publisher
- AMER CHEMICAL SOC
- Keywords
- dopamine; high-voltage; electrolyte additive; electrochemical polymerization; lithium-ion battery
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.8, no.33, pp.21366 - 21372
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 8
- Number
- 33
- Start Page
- 21366
- End Page
- 21372
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/13095
- DOI
- 10.1021/acsami.6b06074
- ISSN
- 1944-8244
- Abstract
- Dopamine, which can be electrochemically oxidized to polydopamine on cathode surface, was introduced as an electrolyte additive for high-voltage lithium-ion batteries (LIBs). The addition of 0.1 wt % dopamine to the electrolyte led to the formation of a polydopamine-containing layer on the cathode, thereby resulting in suppression of the oxidative decomposition of the electrolyte during high-voltage operation (up to 4.5 V) of a LiNi1/3Co1/3Mn1/3O2/artificial graphite cell. The addition of dopamine to the electrolyte improved the capacity retention of the cell from 136 to 147 mAh g(-1) after 100 cycles at a rate of 1C and a cutoff voltage of 4.5 V, while the cycle performance and rate capability with a cutoff voltage of 4.3 V were comparable to those of the cell without dopamine. Further evidence of the positive impact of dopamine on high-voltage LIBs was the lower DC-IRs and AC impedances, as well as the retention of the cathode morphology even after operation at 4.5 V.
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