Enhanced Performance of Aqueous Sodium‐Ion Batteries Using Electrodes Based on the NaTi2(PO4)3/MWNTs–Na0.44MnO2 System. Issue 8 (25th July 2014)

• Record Type: Journal Article
• Authors: Pang, Gang; Nie, Ping; Yuan, Changzhou; Shen, Laifa; Zhang, Xiaogang; Zhu, Jiajia; Ding, Bing
• Is Part Of: Energy technology. Volume 2:Issue 8(2014:Aug.)
• Page Start: 705
• Page End: 712
• Publication Date: 2014-07-25
• Subjects: Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201402045
• Languages: English
• ISSNs: 2194-4288

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Sodium‐ion batteries with good electrochemical performance are of great significance for grid‐scale energy storage applications. Herein, an aqueous rechargeable Na‐ion battery has been fabricated with multiwalled carbon nanotube (MWNT)‐containing NaTi₂(PO₄)₃/MWNTs nanocomposites as the anode and Na_0.44MnO₂ nanorods as the cathode in a 1 <sc>M</sc> aqueous Na₂SO₄ electrolyte and the device was carefully studied. Owing to the open framework structures (containing large interstitial sites) that both NaTi₂(PO₄)₃ and Na_0.44MnO₂ possess, the fast Na‐ions will facilitate free transport. Benefiting from their unique structural features, the aqueous battery system exhibited an average charge and discharge voltage of approximately 1.1 V, a high energy density of 58.7 Wh kg⁻¹ in terms of total electroactive materials, and could deliver a reversible capacity of approximately 50 mAh g⁻¹ after 300 cycles at 2 <italic>C</italic> rate; the corresponding coulombic efficiency was nearly constant at approximately 95 %. These results, together with the safety and cost perspectives of aqueous electrolytes indicated that the aqueous Na‐ion battery may be a good candidate for safe, inexpensive, high‐power energy storage systems.</p> </abstract>