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- W4378222015 abstract "Abstract Transitioning to solid‐state batteries using polymer electrolytes results in inherently safer devices and can facilitate the use of sodium metal anodes enabling higher energy densities. In this work, solvent‐free ternary polymer electrolytes based on cross‐linked polyethylene oxide (PEO), sodium bis(fluorosulfonyl) imide (NaFSI) or sodium bis(trifluoromethanesulfonyl) imide (NaTFSI) and N‐butyl‐N‐methyl‐pyrrolidinium‐based ionic liquids (ILs, Pyr 14 FSI or Pyr 14 TFSI) are developed. Synthesized polymer membranes are thoroughly characterized, verifying their good thermal and electrochemical stability, as well as a low glass transition and crystallinity, thus high segmental mobility of the polymer matrix. The latter results in good ionic conductivities around 1×10 −3 S cm −1 at 20 °C. The polymer electrolytes are successfully employed in sodium‐metal battery (SMB) cells operating at room temperature (RT) and using P2‐Na 2/3 Ni 1/3 Mn 2/3 O 2 layered oxide as cathode. The electrochemical performance strongly depends on the choice of anion in the conducting sodium salt and plasticizing IL. Furthermore, this solid‐state SMB approach mitigates capacity fading drivers for the P2‐Na 2/3 Ni 1/3 Mn 2/3 O 2 , resulting in high Coulombic efficiency (99.91 %) and high capacity retention (99 % after 100 cycles) with good specific capacity (140 mAh g −1 )." @default.
- W4378222015 created "2023-05-26" @default.
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- W4378222015 date "2023-06-14" @default.
- W4378222015 modified "2023-09-30" @default.
- W4378222015 title "Solvent‐free Ternary Polymer Electrolytes with High Ionic Conductivity for Stable Sodium‐based Batteries at Room Temperature" @default.
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- W4378222015 doi "https://doi.org/10.1002/batt.202300092" @default.
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