원문정보
Analysis of Lithium-ion Battery Swelling Behavior and Thermal Runaway Risk due to Gas Generation at High Temperature of Three Metal Component Cathode Materials
초록
영어
In this study, NCM cathode materials were mainly analyzed to confirm the fire risk of LIB. NCM cathode materials have poor surface stability and poor structural stability at high temperatures, so gas is generated and the cell swells, causing swelling. To confirm this phenomenon, a pouch full cell was manufactured and electrochemical output characteristics were tested, and it was confirmed that the cell surface temperature risen to 60°C. As a result of ICP-MS analysis, it was confirmed that the higher the ratio of Ni in the NCM cathode and the higher the temperature environment, the higher the solubility of Ni. In fact, the pouch full cell was stored in a high-temperature oven for a total of 4 weeks, and the swelling behavior was measured at intervals of 1 week, and the amount of gas generation was quantitatively measured through the internal pressure cell. As a result, the higher the Ni ratio, the more gas generated. In order to determine the correlation between these gas emissions and fire, harsh conditions were applied via a DC power supply. As a result, it was confirmed that the higher the ratio of Ni and the greater the number of charging and discharging, the more the cell swelled, the faster it exploded, and the higher the temperature at the time of explosion.
목차
1. 서론
1.1 연구배경 및 목적
1.2 사례 분석
2. 실험
2.1 리튬이온배터리(LIB) 파우치 풀 셀 제작 재료
2.2 리튬이온배터리(LIB) 파우치 풀 셀 전기화학 출력 특성 평가 및 셀 표면온도 측정
2.3 리튬이온배터리 분석을 위한 시료 해체
2.4 리튬이온배터리 전극(양극)의 표면 분석
2.5 리튬이온배터리 전극(양극)의 표면 임피던스(저항) 분석
2.6 리튬이온배터리 파우치 풀 셀 고온 저장에 따른 두께 변화 측정
2.7 전극(양극) 3성분계 금속(Ni, Co, Mn) 용해량 측정
2.8 전극(NCM811(Ni≥80%), NCM721(Ni≥70%), NCM622(Ni≥60%)) 가스 발생량 측정
2.9 과충전 시 리튬이온배터리 파우치 풀 셀의 폭발 시간 및 온도 측정
3. 결과 및 고찰
3.1 LIB 파우치 풀 셀의 전기화학 출력 특성에 따른 셀 표면온도 분석
3.2 전극(양극)의 표면 분석
3.3 NCM 양극 표면 저항 분석
3.4 전극(양극) 3성분계 금속(Ni, Co, Mn) 용해량 분석
3.5 리튬이온배터리(LIB) 풀 셀의 고온 저장에 따른 셀 두께 변화 분석
3.6 전극(NCM811(Ni≥80%), NCM721(Ni≥70%), NCM622(Ni≥60%))의 Ni 비율에 따른 가스 발생량 분석
3.7 과충전 시 리튬이온배터리 파우치 풀 셀의 폭발 시간 및 온도 분석
4. 결론
참고문헌