Electrolyte engineering for highly inorganic solid electrolyte interphase in high-performance lithium metal batteries
DOKPE
- Zhao, Yan University of Fribourg
- Zhou, Tianhong University of Fribourg
- Jeurgens, Lars P.H. EMPA
- Kong, Xian South China University of Technology
- Choi, Jang Wook Seoul National University
- Coskun, Ali ORCID University of Fribourg
- 02.01.2023
Published in:
- Chem. - Elsevier BV. - 2023, vol. 9, no. 3, p. 682-697
Materials Chemistry
Biochemistry (medical)
General Chemical Engineering
Environmental Chemistry
Biochemistry
General Chemistry
weakly coordinated diluent
Li2O
solid electrolyte interphase
Li metal
English
Electrolytes play pivotal roles in the stabilization of Li metal surface and operation at high voltages. In particular, localized high-concentration electrolytes have outperformed state-of-the-art electrolytes due to their unique solvation structures. However, a direct correlation between solvation structure in LHCEs, in particular for weakly coordinated diluents, and SEI composition is not well understood, yet it is highly critical to realize high Coulombic efficiency (CE) beyond 99.5%. Here, a class of electrolyte based on bis(2,2,2-trifluoroethoxy)methane and 1,2-dimethoxyethane was introduced to regulate anion decomposition to achieve ultra-high Li2O content of 63% in the SEI along with a highly uniform phase distribution. These unique features enabled a record-high CE of 99.72% and proved the impact of homogeneously distributed high Li2O SEI. The related Li|LiNi0.8Co0.1Mn0.1O2 full cell with a negative/positive capacity ratio of 2.5 achieved 90% capacity retention after 200 cycles at 1 C and 80% retention after 596 cycles at 3 C.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Chimie
- Language
-
- English
- Classification
- Chemical technology
- License
- Rights reserved
- Open access status
- green
- Identifiers
-
- DOI 10.1016/j.chempr.2022.12.005
- ISSN 2451-9294
- Persistent URL
- https://folia.unifr.ch/unifr/documents/326024
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