title: Dopamine as a Novel Electrolyte Additive for High-Voltage Lithium-Ion Batteries.
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 1 C 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.
authors: Department of Chemical and Biological Engineering, Hanbat National University , 125 Dongseo-daero, Yuseong-gu, Daejeon, 34158, Republic of Korea.
authors: Hoogil
authors: H
authors: Lee
authors: Department of Chemical and Biological Engineering, Hanbat National University , 125 Dongseo-daero, Yuseong-gu, Daejeon, 34158, Republic of Korea.
authors: Taeyeong
authors: T
authors: Han
authors: Department of Materials Science and Chemical Engineering, Hanyang University , 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea.
authors: Kuk Young
authors: KY
authors: Cho
authors: Department of Chemical and Biological Engineering, Hanbat National University , 125 Dongseo-daero, Yuseong-gu, Daejeon, 34158, Republic of Korea.
authors: Myung-Hyun
authors: MH
authors: Ryou
authors: Department of Chemical and Biological Engineering, Hanbat National University , 125 Dongseo-daero, Yuseong-gu, Daejeon, 34158, Republic of Korea.
authors: Yong Min
authors: YM
authors: Lee
keywords: dopamine; electrochemical polymerization; electrolyte additive; high-voltage; lithium-ion battery