An electrolyte includes an ionic liquid and an electrolyte salt dispersed in the ionic liquid. The ionic liquid includes organic nitrogen cations and charge-delocalized organic anions. The electrolyte salt is selected from alkali metal salt and/or alkaline earth metal salt.

A metal-oxygen battery can provide improved energy storage and transportation applications due to high gravimetric energies, and such a metal-oxygen battery can include a polyolefin including a plurality of functional groups such as sulfamide, sulfoxy, carbonyl, phosphoramide or heterocyclic groups.

A safe all-solid-state lithium secondary battery using a functionalized Metal-organic framework (MOFs)-based sol-id-state electrolyte composite and methods for manufacturing that electrolyte are provided. Specifically, that solid-state electrolyte composite includes MOFs material and traditional polymer, which are mixed and electrospining into a solid thin film. The solid-state electrolyte could significantly reduce the safety risk as well as enhance the Li+ conductivity rate through reducing the degree of crys-tallinity for polymer and coupling the polymer within the oriented and uniform pore structures in MOFs, thus improving the ionic conductivity and enhancing the Li batteries performance. The procedure involves only one step, and it is expected to be easy for scale-up.

The present invention generally relates to electrolytes for use in various electrochemical devices. In some cases, the electrolytes are relatively safe to use; for example, the electrolytes may be resistant to overheating, catching on fire, burning, exploding, etc. In some embodiments, such electrolytes may be useful for certain types of high-voltage cathode materials. In some cases, the electrolytes may include ion dissociation compounds that can dissociate tight ion pairs. Non-limiting examples of ion dissociation compounds include trialkyl phosphates, sulfones, or the like. Other aspects of the invention are generally directed to devices including such electrolytes, methods of making or using such electrolytes, kits including such electrolytes, or the like.

Functionalized polymeric binders for electrolyte and electrode compositions include a polymer having a polymer backbone and functional groups. In some embodiments, a polymer includes a non-polar polymer backbone and a functional group that is 0.1 to 5 wt % of the polymer. In some embodiments, a polymer includes a polar backbone and a functional group that is 0.1 to 50% weight percent of the polymer. Also described are composites for electrolyte separators and electrodes that include argyrodite ion conductors and polar polymers.

A solid-state electrolyte for a multilayer solid-state electrochemical cell is described herein. The electrolyte comprises a lithium electrolyte salt and nanofibers of a cubic phase lithium lanthanum zirconium oxide (c-LLZO), and a polymer interspersed with the nanofibers and electrolyte salt. Electrochemical cells comprising the solid-state electrolyte, and solid-state cathodes comprising the nanofibers of c-LLZO are also described herein.

Provided are sulfide solid electrolyte particles which have sufficient ion conductivity and which are configured to suppress hydrogen sulfide generation, and an all-solid-state battery comprising the sulfide solid electrolyte particles. Disclosed are sulfide solid electrolyte particles comprising Li, P, S and a halogen as constituent elements and having a Li/P molar ratio of more than 3, wherein an oxygen/sulfur element ratio of a particle surface measured by XPS is 0.29 or more and 0.81 and less, and an oxygen/sulfur element ratio at a depth of 30 nm (in terms of a SiO.sub.2 sputter rate) from the particle surface measured by XPS, is 0.29 or less.

A composite includes a fluorinated polymer and nanoparticles of a metal salt. The metal salt has a solubility product of not more than 1×10.sup.−4. The fluorinated polymer includes a fluorinated polymer backbone chain and a plurality of groups represented by formula —SO.sub.2X, in which each X is independently —NZH, —NZSO.sub.2(CF.sub.2).sub.1-6SO.sub.2X′, —NZ[SO.sub.2(CF.sub.2).sub.dSO.sub.2NZ].sub.1-10SO.sub.2(CF.sub.2).sub.dSO.sub.2X′ or —OZ, and Z is independently a hydrogen, an alkali-metal cation, or a quaternary ammonium cation, X′ is independently —NZH or —OZ, and each d is independently 1 to 6. A polymer electrolyte membrane, an electrode, and a membrane electrode assembly including the composite are also provided.

Provided is a metal negative electrode. The metal negative electrode has a first surface and a second surface facing the first surface, and a plurality of grooves may be provided in the first surface.

A solid electrolyte of the present disclosure includes: a porous dielectric having a plurality of pores interconnected; and an electrolyte including a metal salt and at least one selected from the group consisting of an ionic compound and a bipolar compound and at least partially filling an interior of the plurality of pores. The porous dielectric includes a polyether structure. The plurality of pores have an average pore diameter of 20 nm or more and 100 nm or less.