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Advanced Construction Strategy of All-solid-state Lithium Batteries with Excellent Interfacial Compatibility and Ultralong Cycle Life

Abstract

The inferior cycle performance of All-solid-state Lithium Batteries resulted from the low mixed ionic and electronic conductivity in the electrodes, as well as the large interfacial resistance between electrode and electrolyte need to be overcome urgently for commercial applications. Here, an advanced cell construction strategy has been proposed, in which a cohesive and highly conductive PEO-based electrolyte is employed both in cathode layer and the interface of electrolyte/anode, leading to an ASSLB with the superior interfacial contact between electrolyte and electrodes, and forming a three-dimensional ionic conductive network in the cathode layer. Especially, the NASICON-type ionic conductor covered with PEO-based polymer integrates the advantages of inorganic electrolyte and organic electrolyte, presents the enhanced electrochemical stability and an excellent compatibility with the Li electrode. Consequently, the ASSLBs of LiFePO4 (LFP)/Li with this advanced construction strategy exhibit excellent interfacial compatibility, ultralong cycle life and high capacity, i.e., a reversible discharge capacity maintained at 127.8 mAh g-1 for the 1000th cycle at 1 C with a retention of 96.6%, and an initial discharge capacity of 153.4 mAh g-1 with a high retention of 99.9% after 200 cycles at 0.1 C. Besides, the high-voltage monopolar stacked batteries with bipolar structure can be fabricated conveniently, showing an open circuit voltage (OCV) of 6.63 V with a good cycle performance. In particular, the ASSLBs present outstanding safety whether nail penetration or burning in the fire. Therefore, this advanced cell construction strategy may generate tremendous opportunities in the search for novel emerging solid-state lithium metal batteries.

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Publication details

The article was received on 17 May 2017, accepted on 06 Jul 2017 and first published on 08 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA04320A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Advanced Construction Strategy of All-solid-state Lithium Batteries with Excellent Interfacial Compatibility and Ultralong Cycle Life

    Z. Zhang, Y. Zhao, S. Chen, D. Xie, X. Y. Yao, P. Cui and X. Xu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04320A

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