Cellulosic all-solid-state electrolyte for lithium batteries fabricated via bio-synthetic avenue. (1st April 2023)

• Record Type: Journal Article
• Authors: Yin, Sha; Huang, Yang; Han, Jingquan; Wang, Yige; Xu, Yifan; Seidi, Farzad; Xiao, Huining
• Is Part Of: Composites. Number 254(2023)
• Publication Date: 2023-04-01
• Subjects: Bacterial cellulose -- Biological synthesis -- Conductive ceramics -- Composite solid electrolyte -- Lithium battery; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2023.110566
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: Composite solid electrolytes (CSEs) have been attracting tremendous attention as the revolutionary separators using in the next-generation of lithium battery with high safety and improved electrochemical performance. Nevertheless, the traditional CSEs composed of Li + -conducting polymers and ceramics normally suffer from structural deformation, inhomogeneous integration, and inadequate mechanical strength. Herein, the Li1.5 Al0.5 Ge1.5 (PO4 )3 (LAGP) conductive ceramics supported by bacterial cellulose (BC) scaffolds (LAGP@BC) are successfully fabricated as CSEs with the assistance of biosynthesis. After infiltration by polyethylene oxide (PEO), the as-prepared LAGP@BC-PEO presents excellent Young's modulus up to 107.8 MPa. The porous cellulosic architectures encourage homogeneous Li + flux across the CSEs. The LAGP@BC-PEO exhibits high ion transfer number (0.45) and ionic conductivity (1.01 × 10 −4 S cm −1 ). After assembling LAGP@BC-PEO into a full cell, the Li|LAGP@BC-PEO|LiFePO4 delivers a higher capacity (168.2 mAh g −1 ) at 1C and superior capacity retention of 90.4% after 200 cycles. This work provides a judicious design for fabricating CSEs by integrating conductive ceramics into BC scaffolds with a green and mild biosynthetic avenue. Graphical abstract: Image 1 Highlights: Flexible LAGP@BC-PEO is fabricated via bio-synthesis following by PEO/LiTFSI infiltration. The interweaved BC nanofibers maintain the uniform Li + flux and resist the penetration of dendrites. The bio-synthetic approach maintains the even dispersion of LAGP in LAGP@BC-PEO CSEs. LAGP@BC-PEO shows high ion transfer number (0.45) and ionic conductivity (1.01 × 10 −4 S cm −1 ). The full battery exhibits decent reversible capacity and capacity retention.