콘텐츠 본문
논문 해외 국제전문학술지(SCI급) Stabilizing effect of 2-(triphenylphosphoranylidene) succinic anhydride as electrolyte additive on the lithium metal of lithium metal secondary batteries
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2015-07
- 저자명 Jiseon Jeong, Je-Nam Lee, Jung-Ki Park, Myung-Hyun Ryou, Yong Min Lee
- 학술지명 Electrochimica Acta
- 발행처명 Pergamon
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 5
- 논문 다운로드 링크(외부) https://doi.org/10.1016/j.electacta.2015.04.168
- 연구분야 공학 > 화학공학
논문 초록 (Abstract)
We introduce 2-(triphenylphosphoranylidene) succinic anhydride (TPSA) as a lithium (Li) metal anode surface-stabilizing electrolyte additive for improving the cycle performance of Li metal secondary batteries. We verified that TPSA is readily decomposed on Li metal anodes before the decomposition of liquid electrolytes, and forms stable surface layers, i.e., a solid electrolyte interface (SEI). Consequently, TPSA was found to improve the cycle performance of unit cells consisting of LiCoO2/Li metal. The unit cells containing 3 wt.% of TPSA retain 85% of the initial discharge capacity after 100 cycles, whereas the unit cells that do not contain TPSA showed catastrophic failure after only 50 cycles. Each unit cell was operated at C/2 rate (0.8 mA cm−2) in the voltage range 3.0–4.2 V vs. Li/Li+. The TPSA-derived SEI suppresses continuous electrolyte decomposition, and thereby Li dendrite formation as well. The effect of TPSA was characterized by scanning electron microscopy, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy.
