Ca-doped Na2Zn2TeO6 layered sodium conductor for all-solid-state sodium-ion batteries

• DOI: 10.1016/j.electacta.2018.12.092
• Publication Date: 2018-12-18T10:27:45Z
• Authors: Zhi Deng; Jintao Gu; Yuyu Li; Shuai Li; Jian Peng; Xiang Li; Jiahuan Luo; Yangyang Huang; Chun Fang; Qing Li; Jiantao Han; Yunhui Huang; Yusheng Zhao
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Abstract Na2Zn2TeO6 is a potential sodium solid electrolyte of all-solid-state sodium-ion batteries. In this work, Na+ ion conductivity and electrochemical performance of layered Ca-doped Na2Zn2-xCaxTeO6 (x = 0–0.05) (NZTO-Cx) electrolytes have been investigated. The highest conductivity has been achieved 7.54 × 10−4 S cm−1 in NZTO-Cx at x = 0.02, at room temperature due to grain-boundary modification and interlayer-interface elimination. Meanwhile, chemical stability with metallic Na anode and electrochemical window of NZTO-Cx are improved by Ca doping. Furthermore, the cycle stability of Na3V2(PO4)3/NZTO-Cx/Na solid-state batteries have been successfully increased by Ca doping. These advantages highly demonstrate good potential application prospect of NZTO-Cx in all-solid-state sodium-ion batteries.