Nylon-based polymer solid electrolyte high viscoelasticity!
It is well known, stable and compatible electrolyte / electrode hetero-interface is crucial in solid and flexible battery. However, continuous electrochemical cycling can lead to mechanical deformation and dislocation structure and side reactions. Therefore, the construction of compatible and stable interface to ensure accurate contact between the battery pack is one of the most important challenges. To address this challenge, with the Chinese Academy of Science Qingdao Bio-energy processes Cuiguang Lei, Zhao Jingwen Chinese Academy of Sciences and DICP Hou Jin, who first proposed the customized highly viscoelastic polyamide (PA, nylon) based solid polymer electrolyte to achieve interface compatible solution . Specifically, i.e. by a high concentration of bis (trifluoromethanesulfonyl) imide lithium solution (of LiTFSI) to unlock the molecular chain PA and strongly hydrogen-bonded, and a bridge having a cation which is a reproduction – anionic associative crosslinked structure. Such crosslinking techniques designed to impart the PA-based electrolyte desirable mechanical properties, including high viscoelasticity and reversible stretchability. It is worth noting that this is not only the first PA dissolved in an aqueous solution, is PA-based viscoelastic polymer electrolyte rollout. This work shows that by reconstructing the classical structure and development of functional polymer electrolyte, can overcome the bottleneck of the next generation of solid-state battery interface defects arising. As used herein highlights: 1, in conjunction with small-angle X-ray scattering (the SAXS), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR) and solid state nuclear magnetic resonance (NMR) technique, it was confirmed on the relevant ion (Li + -TFSI – ) is inserted in the chain between the PA, by Li + and the coordination between the cationic group and the TFSI – [123 ] chain relationship between weak hydrogen bonds formed between the anion and an amino group. This conformational modified ultrahigh PA network having viscoelastic and reversible stretchability. 2, more importantly, reduce inter-chain ionic association and interaction between the metal group, thus promoting fast ion conductivity cm (2.7 × 10 -4 S – 1 ) . That is, by constructing a crosslinked structure having a bridging coordinating anion and a cation to bypass the contradiction between the ion conductivity and viscoelasticity modulus. These features make electricityElectrode and an electrolyte movement may be synchronized, even when the terminal to be modified to ensure a stable interface charge transfer. 3, PA-based electrolyte having a further wide electrochemical stability window, (> 3 V with respect to the Zn / Zn 2 + ), with LiFePO4 cathode and the anode, and Zn metal after 400 cycles, the battery still retains 82% of the initial capacity. On further demonstrated Based on the flexible battery electrolyte PA , wherein the synchronization of the electrolyte / electrode can be moved close and ensure compatibility even under extreme deformation (180 ° bend and a pressure of 5 MPa over) and electrochemical stimulation interface. These results provide a new perspective for the development of advanced batteries, based on the polymer electrolyte compatible interface engineering classic paved the way for regeneration.