Opening and Constructing Stable Lithium‐ion Channels within Polymer Electrolytes

Author:

Zhao Yangmingyue1ORCID,Li Libo1ORCID,Zhou Da1,Ma Yue2,Zhang Yonghong3,Yang Hang1,Fan Shubo1,Tong Hao1,Li Suo1,Qu Wenhua1

Affiliation:

1. School of Materials Science and Chemical Engineering Harbin University of Science and Technology Harbin 150040 China

2. School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China

3. School of Integrative Biological and Chemical Sciences The University of Texas Rio Grande Valley Edinburg TX 78539-2999 USA

Abstract

AbstractLithium‐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.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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