Na-ion battery, as an alternative high-efficiency and low-cost energy storage device to Li-ion battery, has attracted wide interest for electrical grid and vehicle applications. However, demonstration of a full-cell battery with high energy and long cycle life remains a significant challenge. Here, we investigated the role of solid electrolyte interphase (SEI) formation on both cathodes and anodes and revealed a potential way to achieve long-term stability for Na-ion battery full-cells. Pre-cycling of cathodes and anodes leads to preformation of SEI, and hence mitigates the consumption of Na ions in full-cells. The example full-cell of Na0.44MnO2-hard carbon with pre-cycled and capacity-matched electrodes can deliver a specific capacity of ~116 mAh/g based on Na0.44MnO2 at 1C rate (1C = 120 mA/g). The corresponding specific energy is ~313 Wh/kg. Excellent cycling stability with ~77% capacity retention over 2000 cycles was demonstrated at 2C rate. Our work represents a leap forward in Na-ion battery development.
Revised: May 4, 2017 |
Published: July 30, 2016
Citation
Li X., P. Yan, M.H. Engelhard, A.J. Crawford, V.V. Viswanathan, C.M. Wang, and J. Liu, et al. 2016.The Importance of Solid Electrolyte Interphase Formation for Long Cycle Stability Full-Cell Na-Ion Batteries.Nano Energy 27.PNNL-SA-115949.doi:10.1016/j.nanoen.2016.07.030