Pillared MXene with Ultralarge Interlayer Spacing as a Stable Matrix for High Performance Sodium Metal Anodes. (27th November 2018)

• Record Type: Journal Article
• Authors: Luo, Jianmin; Wang, Chuanlong; Wang, Huan; Hu, Xiaofei; Matios, Edward; Lu, Xuan; Zhang, Wenkui; Tao, Xinyong; Li, Weiyang
• Is Part Of: Advanced functional materials. Volume 29:Number 3(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-11-27
• Subjects: interlayer space -- MXene -- pillared structures -- sodium metal -- Ti3C2; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201805946
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Sodium (Na) metal is a promising alternative to lithium metal as an anode material for the next‐generation energy storage systems due to its high theoretical capacity, low cost, and natural abundance. However, dendritic/mossy Na growth caused by uncontrollable plating/stripping results in serious safe concerns and rapid electrode degradation. This study presents Sn 2+ pillared Ti3 C2 MXene serving as a stable matrix for high‐performance dendrite‐free Na metal anode. The intercalated Sn 2+ between Ti3 C2 layers not only induces Na to nucleate and grow within Ti3 C2 interlayers, but also endows the Ti3 C2 with larger interlayer space to accommodate the deposited Na by taking advantage of the "pillar effect, " contributing to uniform Na deposition. As a result, the pillar‐structured MXene‐based Na metal electrode could enable high current density (up to 10 mA cm −2 ) along with high areal capacity (up to 5 mAh cm −2 ) over long‐term cycling (up to 500 cycles). The full cell using MXene‐based Na metal anode exhibits superior electrochemical performance than that using host‐less commercial Na. It is believed that the well‐controlled MXene‐based Na anode not only extends the application scope of MXene, but also provides guidance in designing high‐performance Na metal batteries. Abstract : A tin(II) ions (Sn 2+ ) pillared titanium carbide (Ti3 C2 ) MXene matrix serves as a highly stable host for metallic sodium (Na) anodes. The intercalated Sn 2+ not only induces Na nucleation and growth within Ti3 C2 interlayers, but also endows the Ti3 C2 with a larger interlayer space to accommodate the deposited Na by taking advantage of the "pillar effect", effective in suppressing the favorable sites for dendrite growth.