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Issue 23, 2019
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Artificial electrode interfaces enable stable operation of freestanding anodes for high-performance flexible lithium ion batteries

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Abstract

High-performance flexible lithium-ion batteries are leading candidates for 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 anodes 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. Benefitting from these merits, our freestanding anode made of the nano/microstructured NiFe2O4–CNTs composite achieves a high capacity of 612 mA h g−1 based on the total mass of the electrode. The high-performance freestanding anode further enables a stable output capacity of 140 mA h g−1 over 1000 charge/discharge cycles for a full battery using commercial LiMn2O4 as the cathode material. Meanwhile, the excellent rate performance of the freestanding anode guarantees high energy output up to 255 W h kg−1 at a high power density of 12 000 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 is highly stable even under harsh mechanical deformation. This work provides 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.

Graphical abstract: Artificial electrode interfaces enable stable operation of freestanding anodes for high-performance flexible lithium ion batteries

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Supplementary files

Article information


Submitted
27 Mar 2019
Accepted
16 May 2019
First published
16 May 2019

J. Mater. Chem. A, 2019,7, 14097-14107
Article type
Paper

Artificial electrode interfaces enable 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, 7, 14097
DOI: 10.1039/C9TA03302E

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