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Updated: May 1, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
High-Performance Cellulosic Solid-State Electrolytes: Engineering the Li+ Transference Number and Deciphering
Chaopeng Yan1,2, Zhuoxuan Li1,2, Xuezhu Xu1,2,3,4,5
1Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
None:
A novel cellulose-based solid polymer electrolyte (Cell-TFSI) was developed through strategic grafting of trifluoromethanesulfonimide (-TFSI) groups onto the cellulose backbone, simultaneously achieving a high Li+ transference number (0.79), room-temperature ionic conductivity (1.12 × 10-4 S cm-1), and mechanical strength (21.65 MPa). Dielectric relaxation spectroscopy and molecular dynamics simulations reveal that weakly coordinated solvation structures between Li+ and sulfonyl/carbonyl oxygens enable a dominant hopping-decoupled ion transport mechanism. Density functional theory calculations demonstrate superior Li+ affinity for -TFSI groups (ΔEAbs. = -7.167 eV) compared to hydroxyl groups (-4.457 eV). The cell-TFSI electrolyte forms an in situ LiF-rich solid electrolyte interphase that enables stable lithium plating/stripping cycling for over 1000 h. This work establishes a universal weak solvation and anion immobilization design principle for sustainable, high-performance solid-state polymer electrolytes.
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