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A self-healing Sn anode with an ultra-long cycle life for sodium-ion batteries

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Abstract

For a next-generation sodium battery to replace lithium ion batteries, it is essential to develop an anode with a long cycle life and high rate. Sn is considered to be an ideal candidate for the anode of sodium ion batteries. Here, we report a Sn anode that exhibits ultra-long-term cycle stability with a high capacity of 554 mA h gāˆ’1 at 10C-rate for 5000 cycles. The optimized cell configuration consists of 1,2-dimethoxyethane as the electrolyte, a double separator including a nanoporous membrane, and a Sn anode with MWCNT as a conductive additive. Its capacity retention reaches up to 99.8% and its coulombic efficiency is near 100% for 5000 cycles. Surprisingly, we have discovered that the Sn powder exhibits a self-healing phenomenon during cycling. Sn is initially pulverized into a nanometer-sized powder, and then forms a three-dimensional porous coral-like structure in which ligament-shaped micrometer-sized Sn particles are connected with a low coordination number by room temperature sintering. The coral-like structure is mechanically stable towards volume change and electrically connected. The self-healing structure and mechanism provide a direction for the design of other electrodes with alloying mechanisms.

Graphical abstract: A self-healing Sn anode with an ultra-long cycle life for sodium-ion batteries

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Publication details

The article was received on 02 Oct 2018, accepted on 26 Oct 2018 and first published on 27 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA09544B
Citation: J. Mater. Chem. A, 2018, Advance Article
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    A self-healing Sn anode with an ultra-long cycle life for sodium-ion batteries

    C. Kim, I. Kim, H. Kim, M. K. Sadan, H. Yeo, G. Cho, J. Ahn, J. Ahn and H. Ahn, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA09544B

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