| 학회 |
한국재료학회 |
| 학술대회 |
2020년 가을 (11/18 ~ 11/20, 휘닉스 제주 섭지코지) |
| 권호 |
26권 1호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Structural change and chemical compatibility between cathode materials and solid electrolyte for all solid-state batteries |
| 초록 |
All solid-state Li-ion batteries based on ceramic materials are a promising energy material with high energy density and enhanced cycle and stability. LiNi0.5Co0.2Mn0.3 (NCM523) is one of the best cathode materials with high energy density but also have a disadvantage of structural instability, which caused by the reduction of transition metals releases oxygen, which can lead thermal instability by reacting with flammable liquid electrolyte. The need for non-flammable solid electrolytes has been emphasized to overcome safety concerns. Li6.25La3Zr2O12-Ga0.25 (LLZO-Ga0.25) is a promising solid electrolyte due to its high ionic conductivity and good thermal stability. Chemical compatibility different environments over a wide temperature range between electrode and electrolytes has become important for all solid-state batteries. We conducted a study on the chemical compatibility and structural stability of the cathode material and solid electrolyte in an all-solid-state battery system. It was confirmed through structural analysis that decomposition products such as LiM2O4, M3O4, MO, M (M = Ni, Co, Mn) and La2Zr2O7 were formed by a chemical reaction in the mixed powder of the cathode and solid electrolyte. The structural change due to the decomposition reaction was confirmed as a result of the diffusion of Li-ion at the interface between cathode and solid electrolyte. This systematic study presents an insight for the structural stability of all solid-state batteries consist of layered cathode materials and oxide-based electrolyte materials. |
| 저자 |
홍석재1, 송석현2, 조모세1, 이동주1, 김형섭2
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| 소속 |
1한국원자력(연), 2충북대 |
| 키워드 |
layered cathode material; solid electrolyte; chemical compatibility; thermal stability; interfacial reactivity; all solid-state batteries
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| E-Mail |
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