Abstract: A battery includes: an anode; a cathode including chalcogen separated from the anode; and an electrolyte composition in fluid communication with the anode and the cathode, the electrolyte composition including a fluorinated solvent including: greater than 30 vol % fluorinated carbonate, used with the cathode including a carbon-chalcogen composite having at least 50 wt % chalcogen based on solids weight of the carbon-chalcogen composite; and/or at least 20 vol % fluorinated carbonate and a fluorinated compound different from the fluorinated carbonate, the vol % based on total volume of the electrolyte composition excluding salts.

Abstract: An electrochemical device including: an anode, a cathode, an electrolyte, and a separator separating the anode from the cathode. The separator includes a material that includes at least one of: a linear polymer; a kinetic friction coefficient of up to 2.0; an elongation of at least 240, elongation defined as elongation at break; a ratio of elongation to thickness of at least 10; and/or a modulus of elasticity of up to 270 MPa.

Abstract: An electrochemical device includes a first electrode having 50 wt.% to 99 wt.% immobilized sulfur, 1 wt. % to 12 wt.% binder, and 0.2 wt.% to 12 wt.% porous composition. The porous composition includes 0.0001 wt.% to 40 wt.% of a first porous material having an average pore size less of than 2 nm and 0.05 wt.% to 40 wt.% of a second porous material having an average pore size of 2 nm to 100 nm. The electrochemical device further includes a second electrode opposed from the first electrode and an electrolyte positioned between the first electrode and the second electrode.