ESM self-healing quasi-solid electrolyte network and eutectic mixture enable ultra-long-life lithium batteries
Self-healing quasi-solid polymer/inorganic mixed electrolyte network with deep eutectic solvents for lithium metal batteries
Molecular interactions and the Li+ environment were studied by spectroscopy, solid-state NMR, and theoretical calculations
The prepared electrolyte has high ionic conductivity and a wide electrochemical stability window
In-situ preparation of quasi-solid-state electrolytes enables battery prototypes with high rate capability, long cycle life, and good compatibility with high-voltage cathode materials
The exploration of high-performance polymer-based electrolytes has great prospects for the development of the next generation of lithium metal batteries. In this study, a coupling to a deep eutectic solvent (X-PPS-D4) was prepared by addition reaction, photoinitiated radical crosslinking, and physical blending
Self-healing quasi-solid hybrid electrolyte network
。 X-PPS-D 4 not only has 2.03✗10-4 S-1 at 30 °C
High ionic conductivity
(σ), but also has a wide electrochemical stability window (0∼5.0 V vs. Li + | Li）。 The enhanced lithium ion migration, X-PPS-D 4, is due to a decrease in anion mobility, which is demonstrated by spectroscopic analysis as well as NMR studies and theoretical calculations. At a test temperature of 30 °C, the X-PPS-D 4 can support stable long-term (>1300 h) plating/peel testing of lithium-symmetric batteries at a current density of 0.1 mA cm-2. What’s more, X-PPS-D 4, formed in situ on the LiFePO 4 cathode inside the coin cell cell, promotes excellent cell performance, with specific capacities in excess of 100 mA hg-1 at 5 C and very long cycle life (> 1000 cycles) and high specific capacity at 1 C (> after 1000 cycles). 116.1 mA hg -1 ）。 The X-PPS-D4 also supports coin cell batteries with high-voltage cathodes that perform well. This study provides new insights into the structure-performance relationship between quasi-solid hybrid electrolytes and eutectic mixtures, and provides an effective way for the development of high-performance polymer-based electrolytes for LMBs.
Brief introduction to graphics and text
Schematic diagram of ectopic and in situ preparation of X-PPS-Dn electrolyte membranes
(a) FT-IR spectra for PPS, m-PPS and X-PPS; (b) Amplified spectra of PPS, m-PPS and X-PPS in the frequency range of 1800-1600 cm-1; (c) Raman spectra of m-PP and m-PPS; SEM images of X-PPS-D 4 (d) and corresponding EDS mappings for (e) C, (f) F, and (g) Si (scale 10 μm); (h) and (i) photographic images of X-PPS-D 4; (j) X-PPS-D4 and Celgard kept at different temperatures for 30 minutes; (k) Stress-strain curves for X-PPS-D 4 and X-PS-D 4.
In situ formed self-healable quasi-solid hybrid electrolyte network coupled with eutectic mixture towards ultra-long cycle life lithium metal batteries
Corresponding author: Guang Yang
Communication unit: University of Electronic Science and Technology of China
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