Grain Boundary Design of Solid Electrolyte Actualizing Stable All‐Solid‐State Sodium Batteries. Issue 40 (1st September 2021)

• Record Type: Journal Article
• Authors: Wang, Chengzhi; Sun, Zheng; Zhao, Yongjie; Wang, Boyu; Shao, Changxiang; Sun, Chen; Zhao, Yang; Li, Jingbo; Jin, Haibo; Qu, Liangti
• Is Part Of: Small. Volume 17:Issue 40(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-01
• Subjects: all‐solid‐state metal batteries -- grain boundary phase -- interfacial issues -- interphase design -- solid electrolytes; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202103819
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Advanced inorganic solid electrolytes (SEs) are critical for all‐solid‐state alkaline metal batteries with high safety and high energy densities. A new interphase design to address the urgent interfacial stability issues against all‐solid‐state sodium metal batteries (ASSMBs) is proposed. The grain boundary phase of a Mg 2+ ‐doped Na3 Zr2 Si2 PO12 conductor (denoted as NZSP‐ x Mg) is manipulated to introduce a favorable Na3−2 δ Mg δ PO4 ‐dominant interphase which facilitates its intimate contact with Na metal and works as an electron barrier to suppress Na metal dendrite penetration into the electrolyte bulk. The optimal NZSP‐0.2Mg electrolyte endows a low interfacial resistance of 93 Ω cm 2 at room temperature, over 16 times smaller than that of Na3 Zr2 Si2 PO12 . The Na plating/stripping with small polarization is retained under 0.3 mA cm ‐2 for more than 290 days (7000 h), representing a record high cycling stability of SEs for ASSMBs. An all‐solid‐state NaCrO2 //Na battery is accordingly assembled manifesting a high capacity of 110 mA h g ‐1 at 1 C for 1755 cycles with almost no capacity decay. Excellent rate capability at 5 C is realized with a high Coulombic efficiency of 99.8%, signifying promising application in solid‐state electrochemical energy storage systems. Abstract : Solid electrolytes of high compatibility with sodium metal are critical for rechargeable all‐solid‐state sodium metal batteries. A grain boundary phase of Na3–2 δ Mg δ PO4 into Na3 Zr2 Si2 PO12 is introduced to improve the compatibility with Na metal and suppress electron transport through grain boundary. Ultra‐stable dendrite‐free Na plating/stripping cycles are enabled for 291 days at room temperature.