Ensemble Design of Electrode–Electrolyte Interfaces: Toward High-Performance Thin-Film All-Solid-State Li–Metal Batteries
| Autor: | Su-Ho Cho, Soon-Gil Yoon, Cheng-Fan Xiao, Min Jung Kim, Il-Doo Kim, Yun Chang Park, Jong Heon Kim, Hyun-Suk Kim, Ji-Won Jung, Kwun-Bum Chung |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Materials science General Engineering General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cathode 0104 chemical sciences law.invention Amorphous solid Anode Chemical engineering chemistry law General Materials Science Lithium Thin film 0210 nano-technology Energy source |
| Zdroj: | ACS Nano. 15:4561-4575 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.0c08691 |
| Popis: | In accordance with the fourth industrial revolution (4IR), thin-film all-solid-state batteries (TF-ASSBs) are being revived as the most promising energy source to power small electronic devices. However, current TF-ASSBs still suffer from the perpetual necessity of high-performance battery components. While every component, a series of a TF solid electrolyte (i.e., lithium phosphorus oxynitride (LiPON)) and electrodes (cathode and Li metal anode), has been considered vital, the lack of understanding of and ability to ameliorate the cathode (or anode)-electrolyte interface (CEI) (or AEI) has impeded the development of TF-ASSBs. In this work, we suggest an ensemble design of TF-ASSBs using LiPON (500 nm), an amorphous TF-V2O5-x cathode with oxygen vacancies (Ovacancy), a thin evaporated Li anode (evp-Li) with a thickness of 1 μm, and an artificial ultrathin Al2O3 layer between evp-Li and LiPON. Well-defined Ovacancy sites, such as O(II)vacancy and O(III)vacancy, in amorphous TF-V2O5-x not only allow isotropic Li+ diffusion at the CEI but also enhance both the ionic and electronic conductivities. For the AEI, we employed protective Al2O3, which was specially sputtered using the facing target sputtering (FTS) method to form a homogeneous layer without damage from plasma. In regard to the contact with evp-Li, interfacial stability, electrochemical impedance, and battery performance, the nanometric Al2O3 layers (1 nm) were optimized at different temperatures (40, 60, and 80 °C). The TF-ASSB cell containing Al2O3 (1 nm) delivers a high specific capacity of 474.01 mAh cm-3 under 60 °C at 2 C for the 400th cycle, and it achieves a long lifespan as well as ultrafast rate capability levels, even at 100 C; these results were comparable to those of TF Li-ion battery cells using a liquid electrolyte. We demonstrated the reaction mechanism at the AEI utilizing time-of-flight secondary ion mass spectrometry (TOF-SIMS) and molecular dynamics (MD) simulations for a better understanding. Our design provides a signpost for future research on the rational structure of TF-LIBs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|