| 학회 | 한국공업화학회 |
| 학술대회 | 2018년 봄 (05/02 ~ 05/04, 대구 엑스코(EXCO)) |
| 권호 | 22권 1호 |
| 발표분야 | 무기재료_포스터 |
| 제목 | Degradation mechanism of LiCoO2 in aqueous lithium-ion batteries |
| 초록 | Since the safety issues of nonaqueous lithium-ion batteries, aqueous rechargeable lithium batteries(ARLB) have been highlighted. However, the conventional positive electrodes of layer-structured lithium transition-metal oxide such as LiCoO2(LCO) have suffered from poor cyclability in aqueous electrolyte solution, especially at low pH, which may be attributed to surface degradation from water or H+ intercalation. The fundamental understanding of degradation process of such positive electrodes is still superficial. Here we shed light on irreversibility of LCO electrode during charge and discharge process using various X-ray measurement techniques(XANES, XPS and XRD). LCO electrodes in three different environments are examined; aqueous(pH=7), basic(pH=10) solution and nonaqueous solution. The LCO with neutral aqueous electrolyte solution exhibits capacity fading during cycling due to the insignificant presence of CEI layer and distortion of oxygen for both surface and bulk LCO. |
| 저자 | 오현정1, 나무늬1, Keisuke Yamanaka2, Toshiaki Ohta2, 변혜령1 |
| 소속 | 1KAIST, 2Ritsumeikan Univ. |
| 키워드 | LiCoO2; Aqueous lithium-ion batteries; Degradation mechanism |
