Discussed is an electrolyte solution for a lithium-sulfur battery including a lithium salt, an organic solvent and an additive, and a lithium-sulfur battery including the same, wherein the additive includes a heterocyclic compound containing at least one double bond, and a heterocycle of the heterocyclic compound comprises an oxygen atom or a sulfur atom.

A metal-ion battery and a method for preparing the same are provided. The metal-ion battery includes a positive electrode, a separator, a negative electrode, and an electrolyte. The positive electrode is separated from the negative electrode via the separator, and the electrolyte is disposed between the positive electrode and the negative electrode. In particular, the electrolyte includes an ionic liquid, an aluminum halide, and a metal halide, wherein the metal halide is silver halide, copper halide, cobalt halide, ferric halide, zinc halide, indium halide, cadmium halide, nickel halide, tin halide, chromium halide, lanthanum halide, yttrium halide, titanium halide, manganese halide, molybdenum halide, or a combination thereof.

A positive electrode for a sodium ion battery is provided. The positive electrode includes a sodium metal vanadium fluorophosphate having a formula according to Formula I:

Na.sub.3V.sub.2-xM.sub.xO.sub.y(PO.sub.4).sub.2F.sub.3-y  I;

wherein 0<x≤1, 0≤y≤1, and M is one or more additional metals.

Systems and methods drawn to an electrochemical cell comprising a low temperature ionic liquid comprising positive ions and negative ions and a performance enhancing additive added to the low temperature ionic liquid. The additive dissolves in the ionic liquid to form cations, which are coordinated with one or more negative ions forming ion complexes. The electrochemical cell also includes an air electrode configured to absorb and reduce oxygen. The ion complexes improve oxygen reduction thermodynamics and/or kinetics relative to the ionic liquid without the additive.

A bicyclophosphate-modified ionic liquid compound, the synthesis thereof, an electrochemical electrolyte containing a bicyclophosphate-modified ionic liquid compound, and energy storage device containing the electrolyte are disclosed.

A lithium secondary battery is disclosed herein. In some embodiments, a lithium secondary battery which includes a positive electrode, a negative electrode including a carbon-based material and a silicon-based compound, a non-aqueous electrolyte solution containing LiPF.sub.6, LiN(FSO.sub.2).sub.2, and a non-aqueous organic solvent, and a separator, wherein the non-aqueous organic solvent includes a fluorine-based cyclic carbonate organic solvent and a fluorine-based linear carbonate organic solvent.

The present invention relates to an electrolyte additive, a non-aqueous electrolyte and a lithium ion battery using same. The electrolyte additive includes a compound represented by Formula 1:

##STR00001##

In Formula 1, R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are each independently hydrogen atom, halogen atom, a substituted or unsubstituted chain C.sub.1-C.sub.12 alkyl group, a substituted or unsubstituted chain C.sub.2-C.sub.12 alkenyl group, a substituted or unsubstituted chain C.sub.2-C.sub.12 alkynyl group, or groups represented by RC.sub.nH.sub.2n+1. R is each independently oxygen atom or sulfur atom, and n is positive integer. The electrolyte additive has a special structure. During the first charge and discharge process, redox products formed by oxidation-reduction reaction of multiple conjugated olefin structures adhere to the positive and negative electrode surfaces to form solid electrolyte interface films. The films have low impedance and high lithium ion conductivity, so the lithium ion battery has excellent rate performance and low temperature performance.

The present disclosure relates to a binder solution for all-solid-state batteries. The binder solution includes a polymer binder, a first solvent, and an ion-conductive additive, wherein the ion-conductive additive includes lithium salt and a second solvent, which is different from the first solvent.

A three-dimensionally ordered macroporous (3DOM) metal-organic framework material (MOF)-based quasi-solid-state electrolyte thin film for a safe quasi-solid-state lithium secondary battery are involved in present invention. In detail, the above quasi-solid-state electrolyte combines 3DOM-MOFs and the electrolytes like polymer and traditional liquid electrolyte. The special pore structures in 3DOM-MOFs could both fill the polymer electrolyte and liquid electrolyte with macropores and micropores, respectively. This unique structure could significantly enhance the Li.sup.+ conductivity rate through the different kinds of electrolytes in the corresponding pore structures as well as improves the battery performance. More importantly, this quasi-solid-state electrolyte is much safer than the traditional organic electrolyte. It should be easily to scale-up since the procedures are simple.

The present invention generally relates to various polymer solid electrolyte materials suitable for various electrochemical devices. Certain aspects include a polymer, a plasticizer, and an electrolyte salt. In some cases, the polymer may exhibit certain structures such as: ##STR00001##
where R.sub.1 can be one of the following groups: ##STR00002##
where n is an integer between 1 and 10000, m is a integer between 1 and 5000, and R.sub.2 to R.sub.6 can each independently be one of the following structures: ##STR00003##