Design of poly(acrylonitrile)-based gel electrolytes for high-performance lithium ion batteries

Shih Hong Wang, Ping Lin Kuo, Chien Te Hsieh, Hsisheng Teng

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)

Abstract

The use of polyacrylonitrile (PAN) as a host for gel polymer electrolytes (GPEs) commonly produces a strong dipole-dipole interaction with the polymer. This study presents a strategy for the application of PAN in GPEs for the production of high performance lithium ion batteries. The resulting gel electrolyte GPE-AVM comprises a poly(acrylonitrile-co-vinyl acetate) copolymer blending poly(methyl methacrylate) as a host, which is swelled using a liquid electrolyte (LE) of 1 M LiPF6 in carbonate solvent. Vinyl acetate and methacrylate groups segregate the PAN chains in the GPE, which produces high ionic conductivity (3.5 × 10 -3 S cm-1 at 30 °C) and a wide electrochemical voltage range (>6.5 V) as well as an excellent Li+ transference number of 0.6. This study includes GPE-AVM in a full-cell battery comprising a LiFePO4 cathode and graphite anode to promote ion motion, which reduced resistance in the battery by 39% and increased the specific power by 110%, relative to the performance of batteries based on LE. The proposed GPE-based battery has a capacity of 140 mAh g-1 at a discharge rate of 0.1 C and is able to deliver 67 mAh g-1 of electricity at 17 C. The proposed GPE-AVM provides a robust interface with the electrodes in full-cell batteries, resulting in 93% capacity retention after 100 charge-discharge cycles at 17 C and 63% retention after 1000 cycles.

Original languageEnglish
Pages (from-to)19360-19370
Number of pages11
JournalACS Applied Materials and Interfaces
Volume6
Issue number21
DOIs
Publication statusPublished - 2014 Nov 12

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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