Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 8, Pages 4720-4727Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5083683
Keywords
Li-ion battery; polymer electrolyte; poly(ethyl alpha-cyanoacrylate); LiMn2O4
Funding
- National Basic Research Program of China [2011CB935700]
- National Natural Science Foundation of China [21344003]
- Chinese Academy of Sciences [KGZD-EW-202-2, XDA09010105]
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LiMn2O4-based batteries exhibit severe capacity fading during cycling or storage in LiPF6-based liquid electrolytes, especially at elevated temperatures. Herein, a novel rigid-flexible gel polymer electrolyte is introduced to enhance the cyclability of LiMn2O4/graphite battery at elevated temperature. The polymer electrolyte consists of a robust natural cellulose skeletal incorporated with soft segment poly(ethyl alpha-cyanoacrylate). The introduction of the cellulose effectively overcomes the drawback of poor mechanical integrity of the gel polymer electrolyte. Density functional theory (DFT) calculation demonstrates that the poly(ethyl alpha-cyanoacrylate) matrices effectively dissociate the lithium salt to facilitate ionic transport and thus has a higher ionic conductivity at room temperature. Ionic conductivity of the gel polymer electrolyte is 3.3 x 10(-3) S cm(-1) at room temperature. The gel polymer electrolyte remarkably improves the cycling performance of LiMn2O4-based batteries, especially at elevated temperatures. The capacity retention after the 100th cycle is 82% at 55 degrees C, which is much higher than that of liquid electrolyte (1 M LiPF6 in carbonate solvents). The polymer electrolyte can significantly suppress the dissolution of Mn2+ from surface of LiMn2O4 because of strong interaction energy of Mn2+ with PECA, which was investigated by DFT calculation.
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