A non-aqueous lithium power storage element that includes a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte, the positive electrode having a positive electrode collector and a positive electrode active material layer that includes active carbon, and the non-aqueous lithium power storage element having configuration (1) and/or (2). (1) The negative electrode includes a negative electrode collector and a negative electrode active material layer (2) The non-aqueous electrolyte contains (A) LiPF.sub.6 and/or LiBF.sub.4, (B) an imide lithium salt, and (C) an oxalate-complex lithium salt, the ratio of the mass of component (C) to the total mass of components (A) and (B) being 1.0-10.0 mass %.

A silicon-based negative electrode material, a preparation method therefor, and an application thereof in a lithium ion battery are provided. A lithium ion battery contains the silicon-based negative electrode material. The negative electrode material contains a silicon-containing material and a phosphorus-containing coating layer at the surface of the silicon-containing material. The phosphorus-containing coating layer contains a polymer that has polycyclic aromatic hydrocarbon structural segments. The negative electrode material exhibits improved initial coulombic efficiency, reversible charging specific capacity, cycle charging capacity retention and conductivity. When used in the lithium ion battery, the negative electrode material may improve the energy density of the battery.

Provided is a binder composition for an all-solid-state secondary battery that can produce a slurry composition for an all-solid-state secondary battery having excellent dispersibility and preservation stability and that can cause a solid electrolyte-containing layer to display excellent ion conductivity. The binder composition contains a polymer, ions of a metal belonging to group 1 or group 2 of the periodic table, and a solvent. The solvent includes an organic solvent having a carbon number of 8 or more, and the content of the ions of the metal is not less than 5 mass ppm and not more than 5,000 mass ppm relative to the polymer.

Processes are described for the direct or indirect electrochemical alkaliation of an alkali metal deficient electrochemically active material. The processes include an electrolysis step either during the alkaliation of the alkali metal deficient electrochemically active material on an electrode current collector (direct) or during the regeneration of a reducing agent used for the alkaliation of the electrochemically active material (indirect).

A method for manufacturing an electrode assembly according to the present invention comprises: a step (a) of transferring an electrode, in which a plurality of electrodes and a plurality of separators are alternately stacked, to a first position; a step (b) of forming an adhesive layer on both side portions of the separators, which are provided in the electrode assembly disposed at the first position, in a full width direction; a step of (c) of allowing the pair of pressing blocks provided at a second position to move in a direction corresponding to each other, wherein an interval between the pair of pressing blocks is less than a length of each of the separators in a full width direction and is greater than a length of each of the electrodes in a full width direction; a step (d) of allowing both the side portions of the separator to be bent upward while being in contact with the pressing blocks when the electrode assembly disposed at the first position descends to be inserted between the pair of pressing blocks provided at the second position; and a step (e) of allowing both the bent side portions of the separator to be adhered each other by an adhesive layer while overlapping each other when the pair of pressing blocks moves toward the electrode assembly.

The present disclosure relates to a lithium metal battery that can easily and effectively remove water and hydrofluoric acid, thereby suppressing a decrease in cell performance and lifespan characteristics or an increase in the internal pressure due to the water and hydrofluoric acid, etc., and a method for manufacturing the same.

The present disclosure relates to a positive electrode active material, a preparation method thereof, and a lithium-sulfur battery including the same, more particularly to a positive electrode active material including a particulate structure of a core-shell structure which comprises a core part and a shell part covering the whole surface or a part of the surface of the core part, wherein the core part comprises a sulfur compound, and the shell part comprises a polythiophene acetic acid-polyethylene glycol graft copolymer. The positive electrode active material of the present disclosure has excellent electrochemical reactivity and adsorbs lithium polysulfide to improve capacity and lifetime characteristics of the lithium-sulfur battery.

Improved electrolytes for lithium-based cells can include a dual salt combination of lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide or lithium bis(trifluoro-methanesulfonyl)imide, and a solvent that includes dimethyl carbonate, ethylmethyl carbonate and 5 to 25 volume percent of fluoroethylene carbonate. The improved electrolytes can include additives triethyl phosphate, ethoxy(pentafluoro)cyclotriphosphazene, 1,3-propane sultone, or mixtures thereof, and have small limited amounts of additional cosolvents and/or lithium-free organic additives. The improved electrolytes can be used to prepare lithium-based cells with silicon-based active materials as negative electrodes and nickel rich lithium metal oxides as positive electrodes. The lithium-based cells can achieve high energy, high power, fast charge and long cycle life along with good thermal stability.

A method of making anode active material including silicon, elemental sulfur and a polymer material for an electrochemical energy storage device, includes mixing together silicon particles, elemental sulfur, and at least one polymer to form a mixture; coating the mixture onto a copper current collector to form a coated copper current collector; and subjecting the coated copper current collector to a temperature treatment. An electrochemical energy storage device includes the anode active material, cathode and electrolyte.

A silicon material can include particles with a size between about 10 nanometers and 10 micrometers, where the particles can be porous or nonporous, and a coating disposed on the particles, wherein a thickness of the coating can be between about 1 nm and 1 μm. The coating can optionally include a carbon coating, graphite coating, or a polymeric coating.