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- Title
Design a polymer-based composite electrolyte with high ionic conductivity for high-performance lithium-metal batteries.
- Authors
Nankun Geng; Tongtong Xu; Xinhao Xu; Shasha Zhu; Xianghai Han; Qiyuan Chen; Yiting Peng; Qunjie Xu
- Abstract
Constructing a stable and robust solid polymer electrolyte (SPE) is crucial for achieving dendrite-free lithiummetal anodes and high-performance lithium batteries. However, realizing the integrity of solid electrolytes with high ion conductivity during long-life cycling under high current density remains a significant challenge. In this study, we propose a multifunctional SPE with a polyvinylidene fluoride (PVDF)/co-polyphenol coordination polymer (EACo2) hybrid composite to improve the durability of Li metal anode during repeat plating/stripping cycles by using a facile solution-casting method. The PVDF as a substrate with high mechanical strength and improved lithiophilicity exhibits high ionic conduction and excellent dendrite inhibition ability; meanwhile, the EACo2 fillers with a high density of Lewis-acidic sites contribute to the dissociation of lithium salts and decrystallization of the PVDF, resulting in a high Li-ion transference number and ion conductivity (2.66 x 10-3 S cm-1 at 30 °C). The symmetrical cells with PVDF/EACo2 SPE can stabilize cycling over 1200 hours at a deposition capacity of 0.1 mAh cm-2. Moreover, the assembled full cells Li|LiFePO4 demonstrate long-term stability (1000 cycles at 1 C) with impressive capacity retention of 75 %, offering a promising approach towards high-performance lithium metal batteries.
- Publication
International Journal of Electrochemical Science, 2024, Vol 19, Issue 8, p1
- ISSN
1452-3981
- Publication type
Article
- DOI
10.1016/j.ijoes.2024.100656