Passivation methods and compositions for electrode binders are disclosed. A coated binder particle for use in an electrode film of an energy storage device is provided. The coated binder particle can comprise a coating over the surface of a binder particle, wherein the coating provides ionic insulation to the binder particle. In some embodiments, the coating covers the entire surface of the binder particle. In still further embodiments, a coated binder particle in an energy storage device blocks ionic contact between the binder and an electrolyte.

Passivation methods and compositions for electrode binders are disclosed. A coated binder particle for use in an electrode film of an energy storage device is provided. The coated binder particle can comprise a coating over the surface of a binder particle, wherein the coating provides ionic insulation to the binder particle. In some embodiments, the coating covers the entire surface of the binder particle. In still further embodiments, a coated binder particle in an energy storage device blocks ionic contact between the binder and an electrolyte.

The present disclosure relates to an anode active material for a lithium secondary battery, a method of manufacturing the anode active material, and a lithium secondary battery including the anode active material. The anode active material includes natural graphite particles configured such that flaky natural graphite fragment particles having uneven (□□) surface defects are structured in a cabbage shape or at random and granulated, the surface and the inside of the natural graphite particles including a gap formed between the flaky natural graphite fragment particles, and a coating layer including amorphous or semicrystalline carbon formed on the surface of the flaky natural graphite fragment particles that form the gap and the surface of the natural graphite particles.

Provided herein are dry process electrode films, and energy storage devices incorporating the same, including a microparticulate non-fibrillizable binder having certain particle sizes. The electrode films exhibit improved mechanical and processing characteristics. Also provided are methods for processing such microparticulate non-fibrillizable electrode film binders, and for incorporating the microparticulate non-fibrillizable binders in electrode films.

Provided herein are dry process electrode films, and energy storage devices incorporating the same, including a microparticulate non-fibrillizable binder having certain particle sizes. The electrode films exhibit improved mechanical and processing characteristics. Also provided are methods for processing such microparticulate non-fibrillizable electrode film binders, and for incorporating the microparticulate non-fibrillizable binders in electrode films.

Systems and methods for electrode lamination using overlapped irregular shaped active material may include a battery having a cathode, an electrolyte, and an anode, with the anode including an active material on a metal current collector. The active material may include a plurality of irregularly shaped pieces bonded to the metal current collector, and may include silicon, carbon, and a pyrolyzed polymer. The active material may include more than 50% silicon by weight. The plurality of irregularly shaped pieces may be roll press laminated to the metal current collector. Gaps may remain between some of the irregularly shaped pieces of active material. The gaps may absorb strain in the active material during lithiation of the anode. The metal current collector may include a copper or nickel foil. Portions of the metal current collector not covered by active material may be protected by an adhesive or inorganic layer.

Systems and methods for electrode lamination using overlapped irregular shaped active material may include a battery having a cathode, an electrolyte, and an anode, with the anode including an active material on a metal current collector. The active material may include a plurality of irregularly shaped pieces bonded to the metal current collector, and may include silicon, carbon, and a pyrolyzed polymer. The active material may include more than 50% silicon by weight. The plurality of irregularly shaped pieces may be roll press laminated to the metal current collector. Gaps may remain between some of the irregularly shaped pieces of active material. The gaps may absorb strain in the active material during lithiation of the anode. The metal current collector may include a copper or nickel foil. Portions of the metal current collector not covered by active material may be protected by an adhesive or inorganic layer.

A negative electrode for a lithium secondary battery, in which a LiF layer comprising amorphous LiF in an amount of 30 mol % or more is formed on a negative electrode active material layer comprising a carbon-based active material, a lithium secondary battery comprising the same, and a preparation method thereof.

A negative electrode for a lithium secondary battery, in which a LiF layer comprising amorphous LiF in an amount of 30 mol % or more is formed on a negative electrode active material layer comprising a carbon-based active material, a lithium secondary battery comprising the same, and a preparation method thereof.

A negative electrode includes at least a negative electrode composite material layer. The negative electrode composite material layer contains at least composite particles and a binder. Each composite particle includes a negative electrode active material particle and a film. The film covers at least part of a surface of the negative electrode active material particle. The film contains a layered silicate mineral. The binder includes nanofibers.