Ultra-long cycle life, low-cost room temperature sodium-sulfur batteries enabled by highly doped (N, S) nanoporous carbons. (February 2017)

• Record Type: Journal Article
• Authors: Qiang, Zhe; Chen, Yu-Ming; Xia, Yanfeng; Liang, Wenfeng; Zhu, Yu; Vogt, Bryan D.
• Is Part Of: Nano energy. Volume 32(2017:Feb.)
• Page Start: 59
• Page End: 66
• Publication Date: 2017-02
• Subjects: Na/S battery -- Battery lifetime -- Cycle life -- Carbonate-polysulfide reaction; 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.2016.12.018
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Efficiency, cost, and lifetime are the primary challenges for stationary energy storage with vanadium-redox flow and sodium-sulfur batteries as promising options. In particular, room temperature sodium-sulfur battery systems offer the potential for safe, simple, low-cost and high energy density storage, but the high reactivity or solubility of sodium polysulfides in common liquid electrolytes for carbonates or glycols, respectively, leads to rapid performance loss on cycling. Herein, we demonstrate a robust route to inhibit reactivity of the sulfides with carbonate electrolytes (and also inhibit the diffusion of polysulfides dissolved in TEGDME) and prevent performance loss on cycling using highly doped (≈40 atom%) nanoporous carbon from low-cost raw materials infused with sulfur as the cathode. This cathode design leads to an ultra-stable room temperature sodium-sulfur battery with less than 3% decay in the discharge capacity after 8000 cycles at a high current density of 4.6 A/g. At 0.23 A/g, the discharge capacity is approximately 400 mAh/g and stable over 350 cycles. This combination of low cost and excellent cycle stability is promising for stationary, grid-level energy storage. Graphical abstract: Highly doping (≈40 at%) porous carbons enable stable Na-S battery performance using carbonate-based electrolytes. Highlights: Highly doped (≈40 atom%) porous carbon synthesized from low-cost raw materials Interaction between sulfur and N-doped carbon inhibits reactions with carbonates 10, 000 cycles for a room temperature Na-S battery using carbonate electrolyte Charge and discharge products appear to be Na2 S8 and Na2 S2, respectively