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ode. For the cathode of Zn-based batteries, the dissolution of some active materials and Batteries 2022, 8, 59 will be briefly discussed, with a view to providing new perspectives for improving the performance stability of Zn-based batteries. the formed electronically insulating electrode-electrolyte interface layers, which are nor- mally referred to the SEI layers, affects the battery performance of Zn-based batteries with respect to capacity, rate capability, cyclic life, and so on [61,62]. In the following section, research into the effects of the interaction between electrodes and polymer electrolytes For electrode stabilization, an ideal SEI layer would not only protect the cathode ma- For electrode stabilization, an ideal SEI layer would not only protect the cathode mate- terials from exfoliation but would also contribute to the suppression of corrosion and den- rials from exfoliation but would also contribute to the suppression of corrosion and dendrite drite growth at the Zn anode, which are important factors for the improvement of battery growth at the Zn anode, which are important factors for the improvement of battery perfor- 11 of 17 4.1. Stabilization of Zn Anodes for Aqueous Zn-Based Batteries 4.1. Stabilization of Zn Anodes for Aqueous Zn-Based Batteries performance [63]. Huang et al. proposed a quasi-solid electrolyte interface (quasi-SEI) mance [63]. Huang et al. proposed a quasi-solid electrolyte interface (quasi-SEI) based on a based on a PANa hydrogel electrolyte that could significantly facilitate the electrochemi- PANa hydrogel electrolyte that could significantly facilitate the electrochemical stability cal stability of flexible Zn-NiCo and Zn-air batteries [34]. In their study, the homogeneous of flexible Zn-NiCo and Zn-air batteries [34]. In their study, the homogeneous quasi-SEI wquaasssih-SoEwInwtaosbsehoawblne to ebfefeacbtilveetloyeeflfiemctiinvaetleytehleimZinadtentdhreitZens adnedndernihteasnacnedioenthrancsepoiornt. Ttrhaensapcroyrtla.tTehgeroaucrpyslagtreafgtreoduopnstghreafPtAedNoaneltehcetrPolAyNteachealeicntreoxlhyitbeitcehdaisntroexnhgibelietecdtrosstrtoatnigc ienletecrtraocstitoanticwinittherZanctionsw,liethadZingiotnosu,nleiafodrimngZtonuionnifodrempoZsintiionwdeitphosuitioloncawlinthuoculetaltoicoanl onfuZclnea(Ftiiognuoref7Zan).(FAingaulroeg7oau)s.lAy,nLailnogoeutsally.,dLeivnegloepteadl.adesvelefl-ohpeeadlaablseehlfy-hderaolgaebllelhecytdrorolygtel welietchtrroilgyitde-flwexitibhleribgaicdk-fbloexniebslebabsaecdkboonnceasrbboaxsyemdetohnylccaerlbluoxloysme,ewthhyilchceslhluolwoseed, awhiigch −1 isohnoiwc ceodnadhuicgtihviotyniocfc2o3n.1dmucSticvmity ofd2u3e.1tomtShecmimpdruoveetomtehnetiimn pthreovinetmerefnatcianltchoeminptaetrifbaiclitayl bcoymhpydatriobpilhitiylicbygrhoyudprso[p6h4i]l.icTghreosuypnse[r6g4i]s.tiTcheeffseycntserogfisetilcf-ehfefeaclitnsgofpsreolpf-ehretya,lignogopdrionptertfya-, cgioaol dcoimntpearftaibcilailtycoamndpastriboinligtymaencdhasntriocanlgstmrencghtahnoicfatlhsetrsenlfg-htheaolfatbhle hseyldf-rhoegaellaeblechtryodlyrtoe- pgreolmelpectetrdolmytoereprdoismciptleidnemdoZrne dpilsactinpgli/nsetdriZppnipnglat(iFnigu/srteri7pbp)i.ng (Figure 7b). Figure 7. (a) Schematic illustration of the formation of quasi-SEI between PANa electrolyte and Zn anode. Reproduced with permission from [34]. (b) Schematic illustration of morphology evolution for Zn foils with liquid electrolyte, pure PAM and self-healable hydrogel electrolyte. Reproduced with permission from [64]. with permission from [64]. In addition, it is also important to stabilize the Zn anode through suppression of parasitic HER. For example, Zhu et al. reported that introducing Li+ ions as an additive in a PAM-based hydrogel electrolyte could inhibit HER by suppressing the zinc hydrate [65]. Without adding Li salts, the Zn anode normally displayed a rough surface due to the presence of dendrites. After adding Li salts, the deposited Zn adopted a hexagonal rod conformation. This could be explained in terms of facilitation of Zn nuclei by the Li ions, leading to the growth of hexagonal Zn. When Zn2+ and Li+ ions were coordinately attracted to the Zn anode, a new SEI was obtained. During this process, Li ions replaced zinc ions as the hydrated cations, thus avoiding Zn2+ hydration and suppressing HER [66]. 4.2. Improvement of Electrochemical Peformance of Cathodes Compared to the SEI layers formed on the anode, the cathode-electrolyte interface (CEI) layer is relatively more stable. Analogously to SEI, the interfacial compatibility between the cathode and the polymer electrolyte remains a challenging issue. There is the prospect of introducing an artificial CEI which can not only enhance ion transport between the polymer electrolyte and the cathode, but can also prevent the exfoliation of cathode active materials. For instance, Zhao et al. constructed an artificial CEI based on [EMIM]PF6-PEDOT:PSS with a 3D porous architecture, which was coated on a Bi2S3-based −1 for Zn foils with liquid electrolyte, pure PAM and self-healable hydrogel electrolyte. 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