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Zhu Y, Kennedy ER, Yasar B, Paik H, Zhang Y, Hood ZD, Scott M, Rupp JLM. Uncovering the Network Modifier for Highly Disordered Amorphous Li-Garnet Glass-Ceramics. Adv Mater 2024; 36:e2302438. [PMID: 38289273 DOI: 10.1002/adma.202302438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 01/24/2024] [Indexed: 02/07/2024]
Abstract
Highly disordered amorphous Li7La3Zr2O12 (aLLZO) is a promising class of electrolyte separators and protective layers for hybrid or all-solid-state batteries due to its grain-boundary-free nature and wide electrochemical stability window. Unlike low-entropy ionic glasses such as LixPOyNz (LiPON), these medium-entropy non-Zachariasen aLLZO phases offer a higher number of stable structure arrangements over a wide range of tunable synthesis temperatures, providing the potential to tune the LBU-Li+ transport relation. It is revealed that lanthanum is the active "network modifier" for this new class of highly disordered Li+ conductors, whereas zirconium and lithium serve as "network formers". Specifically, within the solubility limit of La in aLLZO, increasing the La concentration can result in longer bond distances between the first nearest neighbors of Zr─O and La─O within the same local building unit (LBU) and the second nearest neighbors of Zr─La across two adjacent network-former and network-modifier LBUs, suggesting a more disordered medium- and long-range order structure in LLZO. These findings open new avenues for future designs of amorphous Li+ electrolytes and the selection of network-modifier dopants. Moreover, the wide yet relatively low synthesis temperatures of these glass-ceramics make them attractive candidates for low-cost and more sustainable hybrid- or all-solid-state batteries for energy storage.
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Affiliation(s)
- Yuntong Zhu
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Ellis R Kennedy
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
| | - Bengisu Yasar
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
| | - Haemin Paik
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Yaqian Zhang
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
| | - Zachary D Hood
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Applied Materials Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, IL, 60439, USA
| | - Mary Scott
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Jennifer L M Rupp
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Department of Chemistry, Technical University Munich, 85748, Garching, Germany
- TUMint. Energy Research GmbH, Lichtenbergstr. 4, 85747, Garching, Germany
- Department of Electrical and Computer Engineering, Technical University Munich, 80333, Munich, Germany
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
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