A P2-Type Layered Superionic Conductor Ga-Doped Na2Zn2TeO6 for All-Solid-State Sodium-Ion Batteries

作者：Li, Yuyu; Deng, Zhi; Peng, Jian; Chen, Enyi; Yu, Yao; Li, Xiang; Luo, Jiahuan; Huang, Yangyang; Zhu, Jinlong; Fang, Chun; Li, Qing; Han, Jiantao^*; Huang, Yunhui

来源：Chemistry - A European Journal, 2018, 24(5): 1057-1061.

DOI：10.1002/chem.201705466

• all-solid-state batteries
• P2-type
• sodium-ion batteries
• superionic conductor

Here, a P2-type layered Na2Zn2TeO6 (NZTO) is reported with a high Na+ ion conductivity approximate to 0.6x10(-3) Scm(-1) at room temperature (RT), which is comparable to the currently best Na1+nZr2SinP3-nO12 NASICON structure. As small amounts of Ga3+ substitutes for Zn2+, more Na+ vacancies are introduced in the interlayer gaps, which greatly reduces strong Na+-Na+ coulomb interactions. Ga-substituted NZTO exhibits a superionic conductivity of approximate to 1.1x10(-3) Scm(-1) at RT, and excellent phase and electrochemical stability. All solid-state batteries have been successfully assembled with a capacity of approximate to 70mAhg(-1) over 10 cycles with a rate of 0.2 C at 80 degrees C. Na-23 nuclear magnetic resonance (NMR) studies on powder samples show intra-grain (bulk) diffusion coefficients D-NMR on the order of 12.35x10(-12) m(2)s(-1) at 65 degrees C that corresponds to a conductivity sigma(NMR) of 8.16x10(-3) Scm(-1), assuming the Nernst-Einstein equation, which thus suggests a new perspective of fast Na+ ion conductor for advanced sodium ion batteries.

• 出版日期2018-1-24
• 单位华中科技大学