Electrode unit for an electrochemical device

US10629959B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Anna Katharina Dürr · Ludwigshafen, DE
• Jesus Enrique Zerpa Unda · Ludwigshafen, DE
• Gunther Achhammer · Mannheim, DE
• Domnik Bayer · Ludwigshafen, DE
• Peter Heidebrecht · Ludwigshafen, DE
• Stefan Meuer · Worms, DE

Key dates

• Filing date: Jan 28, 2015
• Grant date: Apr 21, 2020
• Expiry date: May 11, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/10
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An electrode unit for an electrochemical device, comprising (i) a solid electrolyte which divides a space for molten cathode material, selected from the group consisting of elemental sulfur and polysulfide of the alkali metal anode material, and a space for molten alkali metal anode material, and (ii) a porous solid state electrode directly adjacent to the solid electrolyte within the space for the cathode material, with a non-electron-conducting intermediate layer S present between the solid state electrode and the solid electrolyte, wherein this intermediate layer S has a thickness in the range from 0.5 to 5 mm and, before the first charge of the electrochemical device, has been impregnated fully with a polysulfide composition, comprising (A) pure polysulfides Met2Sx with Met=alkali metal of the alkali metal anode material selected from lithium, sodium, potassium, and x is dependent on the alkali metal and is 2, 3, 4 or 5 for Na and is 2, 3, 4, 5, 6, 7, 8 for Li and is 2, 3, 4, 5, 6 for K, or (B) mixtures of the polysulfides of one and the same alkali metal from (A) with one another.