A mixed anion hydroborate/carba-hydroborate as a room temperature Na-ion solid electrolyte

被引：83

作者：

Brighi, Matteo ^{[1
]}

Murgia, Fabrizio ^{[1
]}

Lodziana, Zbigniew ^{[2
]}

Schouwink, Pascal ^{[3
]}

Wolczyk, Anna ^{[4
,5
]}

Cerny, Radovan ^{[1
]}

机构：

[1] Univ Geneva, Dept Quantum Matter Phys, Lab Crystallog, Quai Ernest Ansermet 24, CH-1211 Geneva, Switzerland

[2] Polish Acad Sci, Inst Nucl Phys, Ul Radzikowskiego 152, PL-31342 Krakow, Poland

[3] EPFL, ISIC, Rue Ind 17, CH-1950 Sion, Switzerland

[4] Univ Turin, Dept Chem, Via P Giuria 9, I-10125 Turin, Italy

[5] Univ Turin, NIS, Via P Giuria 9, I-10125 Turin, Italy

来源：

JOURNAL OF POWER SOURCES | 2018年 / 404卷

基金：

瑞士国家科学基金会;

关键词：

Solid electrolytes; Structural disorder; Na-ion conductivity; Solid state cyclic voltammetry; Closo-hydroborate carba-hydroborate mix; SODIUM SUPERIONIC CONDUCTION; LITHIUM; REORIENTATIONS; PRINCIPLES; PHASE;

D O I：

10.1016/j.jpowsour.2018.09.085

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The novel compound Na2-x(CB11H12)(x)(B12H12)(1-x) shows a fast ionic Na conductivity of 2 mS cm(-1) at room temperature, reaching the superionic regime above 333 K. A low activation energy of 314 meV, in a thermodynamically and electrochemically stable structure, suggest its usage as a potential solid electrolyte in future all solid Na-ion batteries. Density functional theory simulations indicate the heterovalent anionic mixing to be the responsible in stabilizing a bcc structure, which allows a facile Na+ diffusion already at room temperature. Cyclic voltammetry measurement with a tailored setup for solid-state electrolytes reveals a wide operating window (up to 4.1 V vs. Na+/Na). The symmetrical cell featuring Na-Sn alloy-based electrodes shows reversible Na+ shuttling with limited polarization after more than 700 operating hours.

引用

页码：7 / 12

页数：6

共 50 条

[1] Carbon black:: a promising electrode material for sodium-ion batteries [J].