| 학회 | 한국재료학회 |
| 학술대회 | 2019년 가을 (10/30 ~ 11/01, 삼척 쏠비치 호텔&리조트) |
| 권호 | 25권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | A facile coating approach for stable all-solid-state batteries |
| 초록 | All-solid-state Li-ion batteries (ASSBs) have recently received much attention related to their possibly superior safety along with high power- and energy densities. The combination of thiophosphate-based solid electrolytes (SEs), Ni-rich layered oxide cathode materials and Li metal anode may fulfill these expectations. However, implementation has to face fundamental challenges regarding fast performance fading related to severe interfacial SE decomposition at the electrodes [1]. Therefore, it is need to protect the surface of active material to increase in interfacial kinetic between SE and active materials [2]. One approach to mitigate severe side reactions at the cathode side is to apply a protective surface coating on the cathode active materials, e.g. NCM (Li1+x(Ni1-y-zCoyMnz)1-xO2). The coating layer should be oxidatively stable, possess high Li-ion conductivity and negligible electronic conductivity. Herein, we suggest a simple coating approach to address interfaical issues between solid electrolyte and cathode active materials for improvement the electrochemical performances. This finding is rationalized through transmission electron microscopy, complementary electrochemical impedance spectroscopy leading to the conclusion that the coating layer effectively passivates the interfaces by forming a stable SE/cathode interfacial layer. Overall, our findings again show the beneficial effect of ternary oxide-based protective surface coating on Ni-rich layered oxide cathode materials. References [1] Strauss et. al., Impact of Cathode Material Particle Size on the Capacity of Bulk-Type All-Solid-State Batteries. ACS Energy Lett. 3 (2018) 992. [2] Janek et. al., A Solid Future for Battery Development, Nat. Energy 1 (2016) 16141. |
| 저자 | 김아영 |
| 소속 | Mercedes-Benz Korea |
| 키워드 | Coating; Interface; All-solid-state batteries |
