Facile Formation of a LiF-Carbon Layer as an Artificial Cathodic Electrolyte Interphase through Encapsulation of a Cathode with Carbon Monofluoride
| Autor: | Jong-Heon Lim, Jae-Won Lee, MinHo Yang, Yoon Myung |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Carbon monofluoride Cathode 0104 chemical sciences Anode law.invention chemistry.chemical_compound chemistry Chemical engineering law General Materials Science Lithium 0210 nano-technology Capacity loss Lithium cobalt oxide Dissolution |
| Zdroj: | ACS applied materialsinterfaces. 13(27) |
| ISSN: | 1944-8252 |
| Popis: | Lithium batteries that utilize a lithium anode and a high voltage cathode are highly required to meet the growing demand for electrification of transportation. High voltage lithium cobalt oxide (LiCoO2, LCO) can be a promising choice for lithium batteries with high energy and power. However, intrinsic structural instability at high voltages (>4.2 V) leads to significant capacity loss during the repeated cycles of charge-discharge. Herein, a simple and effective method has been proposed to prepare an artificial protective layer of LCO, enabling the LCO to achieve long-term cycle stability at 4.5 V. It is found that carbon monofluoride reacts with LCO via defluorination at 400 °C to form a LiF-C layer on LCO, which suppresses side reactions at the electrolyte/electrode interface. Moreover, the LiF-C layer plays a key role in not only facilitating charge transport but also restricting Co dissolution from the cathode. The Li//LiF-C coated LCO cells deliver an initial discharge capacity of 186 mAh g-1 at 0.1C and exhibit excellent cycling and rate performance: 161 mAh g-1 after 180 cycles (90% of the initial value at 0.5C) and 115 mAh g-1 at 10C (63.2% of the 0.1C capacity). |
| Databáze: | OpenAIRE |
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