콘텐츠 본문
논문 해외 국제전문학술지(SCI급) Suppression of dendrites and granules in surface-patterned Li metal anodes using CsPF6
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2019-02
- 저자명 Seokwoo Kim,Junyoung Choi,이홍경,Yong-Cheol Jeong,이용민,유명현
- 학술지명 Journal of Power Sources
- 발행처명 Elsevier ScienceDirect
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 6
- 논문 다운로드 링크(외부) https://doi.org/10.1016/j.jpowsour.2018.12.052
- 연구분야 공학 > 화학공학
첨부 파일
논문 초록 (Abstract)
Unexpected Li deposition during plating, which causes low Coulombic efficiency and safety issues, limits the use of Li metal as an anode in commercial secondary batteries. With the recently developed micro-patterned Li metal anodes, dendrite formation during high current Li plating (2.4 mA cm−2) has successfully been reduced, as Li ions are guided into the patterned holes. However, the uncontrolled formation of granular Li is still observed in this material. To overcome these shortcomings, we have introduced cesium hexafluorophosphate into micro-patterned Li metal anodes. This additive employs the self-healing electrostatic shield mechanism to effectively reduce the formation of granular Li and Li dendrites, thereby significantly improving the electrochemical performance of the anodes even when only small amounts (0.05 M) of electrolyte are used. Our experiments revealed that batteries employing surface-patterned Li metal anodes with cesium hexafluorophosphate maintained 88.7% (96.6 mAh g−1) of their initial discharge capacity after the 900th cycle (Charging current density: C/2, 0.6 mA cm−2, Discharging current density: 1C, 1.2 mA cm−2), which is three times higher than the capacity observed with surface-patterned Li metal anodes without the additive (discharge capacity starts to decrease from 300 cycles).
