A sodium metal battery cell and a preparation method thereof, a battery, and an electrical device. The sodium metal battery cell includes: an electrolyte solution, where the electrolyte solution includes a first additive, and the first additive includes an organic compound containing an unsaturated group; and a catalyst, where the catalyst includes at least one of a transition-metal pure element or an alloy thereof.

This disclosure relates to systems and methods for hydrogen sulfide mitigation. A battery cell or plurality of battery cells in a battery pack with a sulfur-containing lithium-based rechargeable battery component is presented. A monolith hydrolyzes hydrogen sulfide gas, precipitated from moisture exposure to the sulfur-based cathode, into sulfur dioxide and water, and releases the sulfur dioxide and water external to the battery cell.

A secondary battery according to exemplary embodiments of the present disclosure includes an electrode assembly, electrode leads joined to electrode tabs extending from each of a cathode and an anode of the electrode assembly, a pouch that accommodates and seals the electrode assembly, and exposes the electrode leads to the outside, and a catalyst part for gas removal disposed inside the pouch, between the electrode assembly and a pouch sealing portion, on a side where the electrode tabs of the electrode assembly extend.