Abstract: A solid-state lithium secondary battery includes an electrode body including a positive electrode containing positive electrode active material particles and solid electrolyte particles, a negative electrode, and a solid electrolyte layer composed of solid electrolyte particles and disposed between the positive electrode and the negative electrode. In the solid-state lithium secondary battery, the solid electrolyte particles contained in the positive electrode and the solid electrolyte particles of the solid electrolyte layer are each composed of a lithium ion conductive material represented by chemical formula Li+(12?n?x)Bn+X2?(6?x)Y?x (Bn+ is at least one selected from P, As, Ge, Ga, Sb, Si, Sn, Al, In, Ti, V, Nb, and Ta; X2? is at least one selected from S, Se, and Te; Y? is at least one selected from F, Cl, Br, I, CN, OCN, SCN, and N3; and 0?x?2) and having an argyrodite-type crystal structure, and the positive electrode and the solid electrolyte layer are obtained by firing, at 100 to 400° C.

Abstract: The present invention relates to a positive electrode for a rechargeable lithium ion battery comprised of single particles containing a compound of the formula LiMPCU, whereby M is a metal selected from the group consisting of Co, Ni, Mn, Fe, Ti or combinations thereof, and whereby in a X-Ray diffraction chart of the electrode the ratio of the intensity I1:I2 of two selected peaks (1) and (2) is larger than (9:1) and wherein I1 represents essentially the intensity of peak (1) assigned to the (020) plane and I2 represents the intensity of peak (2) assigned to the (301) plane. The invention relates further to a process for the manufacture of such a positive electrode and to a battery comprising such an electrode.

Abstract: A method of preparing a lithium secondary battery comprising a negative electrode, a positive electrode, an electrolyte and an additive for improving the stability of the solid electrolyte interface (SEI) film forming on the negative electrode, wherein at least part of said additive is applied to said negative electrode before the battery is assembled.