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High‐Safety All‐Solid‐State Lithium‐Ion Battery Working at Ambient Temperature with In Situ UV‐Curing Polymer Electrolyte on the Electrode
Author(s) -
Yang Zhuang,
Luo Yingwu,
Gao Xiang,
Wang Rui
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000411
Subject(s) - electrolyte , materials science , ionic conductivity , chemical engineering , succinonitrile , battery (electricity) , electrochemistry , curing (chemistry) , polymer , cathode , ethylene oxide , electrode , electrochemical window , composite material , chemistry , power (physics) , physics , quantum mechanics , copolymer , engineering
The development of wearable electronic devices prompts the demand for high‐safety all‐solid‐state lithium‐ion batteries (ASSLIBs), which can work at ambient temperature with comparable performance to traditional commercial lithium‐ion batteries. In this work, a three‐dimensional network design to overcome the contradiction between ionic conductivity and mechanical strength in polymer electrolytes is proposed. The designed solid polymer electrolyte (SPE) has the ion‐conducting group (oligomeric ethylene oxide) fixed on the side chains, whereas the main chain is crosslinked polyacrylate, providing good mechanical strength. Succinonitrile (SN) is uniformly dispersed in the cross‐linked network as an additive. The prepared SN−SPE shows a high ionic conductivity of 4.6×10 −4 S cm −1 at 25 °C with a Li + ‐ion transference number of 0.45 and an excellent electrochemical stability window up to 4.6 V (vs. Li + /Li). The preparation method allows that the electrolyte can be UV‐cured in situ on the cathode to achieve a cathode‐electrolyte integrated electrode, which enhances the interface contact and decreases the interface resistance. As‐fabricated LiFePO 4 //Li 4 Ti 5 O 12 cathode‐electrolyte integrated ASSLIBs can deliver a discharge capacity of 155.88 mAh g −1 at 0.2 C at room temperature and a capacity retention up to 93.62 % after 100 charge‐discharge cycles. The reported polymer electrolyte and advanced assembly process provided a promising strategy for the wearable ASSLIBs.