The importance of solid electrolyte interphase formation for long cycle stability full-cell Na-ion batteries. (September 2016)

• Record Type: Journal Article
• Authors: Li, Xiaolin; Yan, Pengfei; Engelhard, Mark H.; Crawford, Alasdair J.; Viswanathan, Vilayanur V.; Wang, Chongmin; Liu, Jun; Sprenkle, Vincent L.
• Is Part Of: Nano energy. Volume 27(2016:Sep.)
• Page Start: 664
• Page End: 672
• Publication Date: 2016-09
• Subjects: Na-ion battery full cell -- Long cycle stability -- Solid electrolyte interphase; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.07.030
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: 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 Na0.44 MnO2 -hard carbon with pre-cycled and capacity-matched electrodes can deliver a specific capacity of ~116 mAh/g based on Na0.44 MnO2 at 1 C rate (1 C=120 mA/g). The corresponding specific energy is ~313 Wh/kg based on the cathode. Excellent cycling stability with ~77% capacity retention over 2000 cycles was demonstrated at 2 C rate. Our work represents a leap forward in Na-ion battery development. Graphical abstract: Highlights: Na0.44 MnO2 -hard carbon full-cell shows 77% capacity retention over 2000 cycles at 2C rate. Based on the cathode, it has 116 mAh/g capacity and ~313 Wh/kg specific energy at 1C rate. The importance of solid electrolyte interphase to the full-cell performance was demonstrated.