期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 18, 页码 20423-20428出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c01957
关键词
liquid NaK alloy; wetting promotion; membrane electrode; sodium-ion batteries; liquid anode
资金
- National Key Research and Development Program of China [2016YFB0700604]
- Program of National Natural Science Foundation of China [21673008]
The room-temperature liquid anode is a feasible method for building dendrite-free alkali-metal-based batteries. The Na-K phase diagram shows a eutectic point as low as 260.53 K with a long liquid range below 298 K with the molar fraction of potassium ranging from 30.48 to 84.99%. However, the NaK alloy exhibits a very high surface tension preventing it from wetting the current collector surface. Herein, a novel homogeneous dual solid-liquid composite in which the liquid alloy is fixed by the solid Na15Sn4 phase and perfectly stuffed into the grid of the mesh has been designed and fabricated. Based on the liquid range of the NaK alloy, the Na-K-Sn mixture possesses a theoretical specific capacity of 768 mAh g(-1). The symmetric cells of the Na-K-Sngmesh electrodes cycled at 2.0 mA cm(-2) with 1.0 mAh cm(-2) showed little fluctuations with the stable overpotential of similar to 200 mV for 550 h, and the full cell coupled with Na3V2(PO4)(3) showed an initial discharge capacity of 103 mAh g(-1) at 2 C with a retention of 90% after 800 cycles. When the high-loading Na3V2(PO4)(3) electrode is applied in the full cell, a stable cycling life is still maintained with a good capacity retention of 86% over 190 cycles (2.7 mAh cm(-2)) and 91% over 60 cycles (5.2 mAh cm(-2)).
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