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Artificial Electrode Interface Enables Stable Operation of Freestanding Anodes for High-Performance Flexible Lithium Ion Batteries

Abstract

High-performance flexible lithium-ion batteries are leading candidates as power sources of wearable and foldable electronics. As a result, it is vital to design freestanding electrodes with high capacity and stability. Herein, we develop a novel strategy to significantly improve the performance of freestanding electrodes by artificially introducing an ultrathin but robust interface based on polyacrylamide/gelatin gel with excellent mechanical durability and ionic conductivity. The artificial interface suppresses the formation of a thick solid electrolyte interface, facilitates charge transfer processes and strengthens the integrity of the electrode. Benefited from these merits, our freestanding anode made of nano/microstructured NiFe2O4-CNTs composite reaches a high capacity of 612 mAh g-1 based on the total mass of the electrode, which further enables a stable output capacity of 140 mAh g-1 over 1000 charge/discharge cycles for a full battery using commercial LiMn2O4 as the cathode material. Meanwhile, excellent rate performance of the freestanding anode guarantees high energy output up to 255 Wh kg-1 at a high power density of 12000 W kg-1 for the full battery. Moreover, the intrinsic flexibility of the freestanding electrodes enables the fabrication of a flexible lithium-ion battery, which performances highly stable even under harsh mechanical deformation. This work guides a new perspective to fabricate next-generation flexible batteries with high energy density and excellent stability, further advancing the development of foldable and wearable electronics toward practical applications.

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Publication details

The article was received on 27 Mar 2019, accepted on 16 May 2019 and first published on 16 May 2019


Article type: Paper
DOI: 10.1039/C9TA03302E
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Artificial Electrode Interface Enables Stable Operation of Freestanding Anodes for High-Performance Flexible Lithium Ion Batteries

    L. Liu, M. Zhu, S. Huang, X. Lu, L. Zhang, Y. Li, S. Wang, L. Liu, Q. Weng and O. G. Schmidt, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA03302E

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