A High‐performance Lithium Metal Battery with a Multilayer Hybrid Electrolyte

• Published in: Energy & environmental materials (Hoboken, N.J.) Vol. 6; no. 1; pp. 309 - n/a
• Main Authors: Yi, Qiang, Zhang, Wenqiang, Wang, Tianyuan, Han, Junxing, Sun, Chunwen
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 01.01.2023; School of Nanoscience and Technology,University of Chinese Academy of Sciences,Beijing 100049,China%CAS Center for Excellence in Nanoscience,Beijing Institute of Nanoenergy and Nanosystems,Chinese Academy of Sciences,Beijing 100083,China; School of Chemical and Environmental Engineering,China University of Mining & Technology(Beijing),Beijing 100083,China; CAS Center for Excellence in Nanoscience,Beijing Institute of Nanoenergy and Nanosystems,Chinese Academy of Sciences,Beijing 100083,China; School of Nanoscience and Technology,University of Chinese Academy of Sciences,Beijing 100049,China%School of Chemical and Environmental Engineering,China University of Mining & Technology(Beijing),Beijing 100083,China
• Subjects: Electrochemistry; Electrolytes; Flammability; gel interlayer; interfacial stability; Ion currents; Ions; Lithium; Lithium batteries; lithium metal anode; Multilayers; Performance enhancement; Polymers; Room temperature; solid‐state batteries; solid‐state electrolyte; solid-state batteries; interfacial stability; lithium metal anode; gel interlayer; solid-state electrolyte
• ISSN: 2575-0356; 2575-0348; 2575-0356
• DOI: 10.1002/eem2.12289

Solid‐state batteries have been considered as a good choice for substituting traditional batteries with liquid electrolytes because of their high energy density and safe property. However, a little amount of flammable non‐aqueous liquid electrolyte or polymer electrolyte is usually required to improve the interfacial contact, which is adverse to safety. Here, a nonflammable gel is prepared by hydrogen‐bond interaction and applied as an interfacial layer to improve the performance of solid‐state batteries. The prepared multilayer hybrid electrolyte (MHE) composed of gel and CPE shows a wide electrochemical window (5.3 V vs Li/Li+), high ionic transference number (0.57), and ionic conductivity (7.18 × 10−4 S cm−1) at room temperature. Thus, the assembled Li symmetric cell with MHE can cycle over 650 h at 0.5 mA cm−2 with a lower overpotential of ~61 mV. The LiFePO4|MHE|Li cell exhibits a higher discharge capacity of 107.8 mAh g−1 even cycled at 5 C. It also shows superior capacity retention of 96.4% after 1000 cycles at 0.5 C. This work provides a promising strategy for designing high‐performance solid‐state batteries. A nonflammable gel is prepared by hydrogen‐bond interaction and applied as an interfacial layer to improve the performance of solid‐state batteries. The prepared multilayer hybrid electrolyte (MHE) composed of gel and CPE shows wide electrochemical window, high ionic transference number, and ionic conductivity at room temperature. The LiFePO4|MHE|Li cell exhibits remarkable rate capability and cycling performances.