Abstract: A monomer composition is made, particularly to prepare a polymer electrolyte precursor composition capable of forming a solid polymer electrolyte. The monomer composition includes A) an alkylene oxide-based monomer and B) a siloxane monomer. A copolymer electrolyte precursor composition is made for preparation of a solid polymer electrolyte. A polymerization method prepares solid copolymer electrolyte. A copolymer, a solid copolymer electrolyte, and a solid-state lithium secondary battery are made. A method to prepare a solid-state lithium secondary battery is developed, and another method improves electrolyte mechanical property, ionic conductivity, and/or cycling performance in a lithium secondary battery by preparing a solid polymer electrolyte the monomer. An electrochemical device and a device are also provided.

Abstract: An electrolyte for use in an electrochemical cell. The electrolyte includes a first layer having a thickness of about 1 ?m to about 40 ?m and a second layer having a thickness of about 5 ?m to about 60 ?m. The first layer includes, based on a total weight of the first layer, about 10 wt. % to about 40 wt. % of first solid-state electrolyte particles, about 1 wt. % to about 15 wt. % of lithium, and about 1 wt. % to about 65 wt. % of fibrils including carbon and fluorine, The second layer includes second solid-state electrolyte particles.

Abstract: A method for preparing a sulfide electrolyte through multi-step sintering, comprising: performing microwave plasma sintering on a precursor material, and then performing annealing sintering on the precursor material in a muffle furnace to obtain a sulfide electrolyte. By adopting the multi-step sintering method combining microwave plasma sintering and annealing sintering in a muffle furnace, the process of forming crystal nuclei and compacting a preform can be completed quickly, the reaction uniformity of crystal gains in the growing process is guaranteed, and the sulfide electrolyte material with a high crystallinity, a uniform bulk phase and good properties can be obtained rapidly.

Abstract: Provided is an all-solid-state lithium rechargeable cell, comprising: a) a cathode, wherein the cathode comprises: a1) a composite of VS4 and graphene; and a2) a solid catholyte; and b) a lithium-based anode. In particular, the all-solid-state lithium rechargeable cell of the present disclosure may exhibit high initial discharge capacities, high initial Coulombic efficiencies, good reversible capacities, excellent cycling stabilities, high energy densities as well as outstanding safeties.

Abstract: Provided is an all-solid-state lithium rechargeable cell, comprising: a) a cathode, wherein the cathode comprises: a1) a composite of VS4 and graphene; and a2) a solid catholyte; and b) a lithium-based anode.