Opening and Constructing Stable Lithium-ion Channels within Polymer Electrolytes

Yangmingyue Zhao, Libo Li, Da Zhou, Yue Ma, Yonghong Zhang, Hang Yang, Shubo Fan, Hao Tong, Suo Li, Wenhua Qu

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Lithium-ion batteries play an integral role in various aspects of daily life, yet there is a pressing need to enhance their safety and cycling stability. In this study, we have successfully developed a highly secure and flexible solid-state polymer electrolyte (SPE) through the in situ polymerization of allyl acetoacetate (AAA) monomers. This SPE constructed an efficient Li+ transport channel inside and effectively improved the solid-solid interface contact of solid-state batteries to reduce interfacial impedance. Furthermore, it exhibited excellent thermal stability, an ionic conductivity of 3.82×10−4 S cm−1 at room temperature (RT), and a Li+ transport number (tLi+) of 0.66. The numerous oxygen vacancies on layered inorganic SiO2 created an excellent environment for TFSI immobilization. Free Li+ migrated rapidly at the C=O equivalence site with the poly(allyl acetoacetate) (PAAA) matrix. Consequently, when cycled at 0.5C and RT, it displayed an initial discharge specific capacity of 140.6 mAh g−1 with a discharge specific capacity retention rate of 70 % even after 500 cycles. Similarly, when cycled at a higher rate of 5C, it demonstrated an initial discharge specific capacity of 132.3 mAh g−1 while maintaining excellent cycling stability.

Original languageEnglish
Article numbere202404728
JournalAngewandte Chemie - International Edition
Volume63
Issue number31
DOIs
StatePublished - 29 Jul 2024
Externally publishedYes

Keywords

  • facilitate lithium-ion migration
  • in situ construction
  • lithium-ion batteries
  • lithium-ion channel
  • solid-state polymer electrolyte

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