All-solid-state lithium-sulfur polymer electrochemical cells and production methods thereof

An electrochemical cell comprising at least one multilayer component which comprises:

• a positive electrode film comprising, on a current collector, elemental sulfur particles as an electrochemically active material, conductive carbon, and a polymer binder, the elemental sulfur particles being encapsulated in an inorganic coating material, said inorganic coating material comprising an inorganic material selected from:
• LiaM1b(XO4), wherein 0≤a≤2, 0<b≤1;
• M1 is selected from Fe, Mn, Co, Ni, and Ti, or combinations thereof, and X is selected from P, Si and S;
• LicM2dZe, wherein 0≤c≤4, 0<d≤5, 0<e≤12, M2 is selected from Mo, V, Ti, Al, and Si, and Z is O;
• and
• LicM2dZe, wherein 1≤c≤4, 0<d≤5, 0<e≤12, M2 is selected from Mo, V, Ti, Al, and Si, and Z is selected from S and Se;
• a negative electrode film comprising lithium as an electrochemically active material;
• and
• a solid electrolyte film between the negative and positive electrode films, said solid electrolyte film comprising at least one lithium salt and at least one polymeric layer, wherein the solid electrolyte film is an ion-conductive film and further comprises at least one electrolyte inorganic compound in the polymeric layer or in a separate ion-conductive solid layer, the polymeric layer comprising a block copolymer composed of at least one lithium-ion solvating segment and at least one cross-linkable segment, the cross-linkable segment being a polymer segment comprising at least one functional group cross-linkable multi-dimensionally by irradiation or thermal treatment, and the lithium-ion solvating segment being selected from homo- and copolymers having repeating units of formula (I):
• wherein,
• R is selected from H, C1-C10 alkyl, or —(CH2—O—RaRb);
• Ra is (CH2—CH2—O)y;
• Rb is selected from H and a C1-C10 alkyl group;
• x is an integer selected from the range of 10 to 200,000;
• and
• y is an integer selected from the range of 0 to 10.