Dual fluorination of polymer electrolyte and conversion-type cathode for high-capacity all-solid-state lithium metal batteries

Abstract All-solid-state batteries are appealing electrochemical energy storage devices because of their high energy content and safety. However, their practical development is hindered by inadequate cycling performances due to poor reaction reversibility, electrolyte thickening and electrode passivation. Here, to circumvent these issues, we propose a fluorination strategy for the positive electrode and solid polymeric electrolyte. We develop thin laminated all-solid-state Li||FeF 3 lab-scale cells capable of delivering an initial specific discharge capacity of about 600 mAh/g at 700 mA/g and a final capacity of about 200 mAh/g after 900 cycles at 60 °C. We demonstrate that the polymer electrolyte containing…

• NN
  National Natural Science Foundation of China

  Awards: 21975276, 52102329, U1830113, 51772313
• SA
  Science and Technology Commission of Shanghai Municipality

  Awards: 20520710800, 21XD1424400
• PO
  Program of Shanghai Academic Research Leader

  Award: 21XD1424400
• NS
  National Safety Academic Fund

  Award: U1830113