Abstract: A polymorphic lithium-silicon compounds for use in pure silicon anode of lithium-ion battery and use thereof are provided. The pure silicon anode includes nucleuses which have one or more structures of Li4.1Si_Cmcm, Li13Si4_Pbam, Li2Si_C12m1, and LiSi_I41/AZ. It was generally believed Li4.1Si_Cmcm to be a high-temperature stable phase, not presenting at room temperature or in the pure silicon anode of lithium-ion battery, but this present invention proves that Li4.1Si_Cmcm can exist in the disclosed material. After lithiation process, the pure silicon anode can have a structure of one or more of Li4.1Si_Cmcm, Li13Si4_Pbam, Li2Si_C12m1, and LiSi_I41/AZ, with extremely improved capacity. The present disclosure may increase the electrical capacity of the pure silicon anode in actual use and solve the problem of the existing pure silicon anode that the volume expansion after repeated lithiation and delithiation leads to electrode damage and battery failure.

Abstract: Provided is a solid electrolyte which is identified as 3LiOH·Li2SO4 by diffractometry. The solid electrolyte further contains boron.

Abstract: Disclosed are an electrolyte solution and an additive thereof, which may improve electrochemical properties of a lithium secondary battery.

Abstract: The present invention provides a fabrication method of a multilayer electrode for a secondary battery including: (a) preparing two or more electrode slurries each containing an electrode active material, a binder, and a solvent and heating at least one electrode slurry selected from the prepared two or more electrode slurries to a temperature lower than a boiling point (Tb) of the solvent contained in the selected electrode slurry; (b) coating the two or more electrode slurries on a current collector; and (c) cooling the coated two or more electrode slurries.

Abstract: Provided is a technology that allows precipitated metallic lithium to be rendered harmless in a lithium ion secondary battery. The nonaqueous electrolyte solution of a lithium ion secondary battery disclosed herein contains a lithium salt as an electrolyte salt, a nonaqueous solvent, and an aromatic carboxylic acid compound and an aryl halide compound, as additives.

Abstract: The solid electrolyte according to an embodiment of the present disclosure is represented by the following formula (1): Li7?yLa3(Zr2?x?yGexMy)O12??(1) wherein 0.00<x?0.40, 0.00<y?1.50, M is Sb or is Sb and an element of at least one of Nb and Ta.

Abstract: A negative electrode material for a secondary battery includes a matrix containing silicon oxide, a composite oxide of one or more doping elements selected from an alkali metal, an alkaline earth metal, and a post-transition metal, and silicon, or a mixture thereof; and silicon nanoparticles dispersed and embedded in the matrix.

Abstract: A main object of the present disclosure is to provide an all solid state battery with excellent capacity durability when restraining pressure is not applied or even when low restraining pressure is applied thereto. The present disclosure achieves the object by providing an all solid state battery comprising layers in the order of a cathode layer, a solid electrolyte layer, and an anode layer; wherein the anode layer contains an anode active material including a silicon clathrate type II crystal phase; restraining pressure of 0 MPa or more and less than 5 MPa is applied to the all solid state battery in a layering direction; and when a capacity ratio of anode capacity with respect to cathode capacity is regarded as A, the capacity ratio A is 2.5 or more and 4.8 or less.

Abstract: A method for pre-treating lithium metal for a lithium secondary battery including stripping a surface oxide film formed on a surface of the lithium metal by discharging the battery, and a plating lithium metal on the surface of the lithium metal, from which the surface oxide film has been stripped, by charging the battery.