An anode active material including different types of particles, an anode composition including the anode active material and a lithium secondary battery including the anode active material are disclosed. In an aspect, an anode active material includes a carbon-based active material, and a silicon-based active material having a minimum particle diameter (Dmin) in a range from 0.5 μm to 2.5 μm, a volume average particle diameter (D50) in a range from 3.0 μm to 7.0 μm, and a specific surface area in a range from 0.1 m.sup.2/g to 2.5 m.sup.2/g.

The present technology relates to a dry method of manufacturing a positive electrode for a lithium secondary battery, a positive electrode manufactured thereby, and a lithium secondary battery including the same. Thereby, a positive electrode including a positive electrode mixture layer with an appropriate density, and effective adhesion between the positive electrode mixture layer and the current collector may be realized.

An immobilized selenium body, made from carbon and selenium and optionally sulfur, makes selenium more stable, requiring a higher temperature or an increase in kinetic energy for selenium to escape from the immobilized selenium body and enter a gas system, as compared to selenium alone Immobilized selenium localized in a carbon skeleton can be utilized in a rechargeable battery Immobilization of the selenium can impart compression stress on both the carbon skeleton and the selenium. Such compression stress enhances the electrical conductivity in the carbon skeleton and among the selenium particles and creates an interface for electrons to be delivered and or harvested in use of the battery. A rechargeable battery made from immobilized selenium can be charged or discharged at a faster rate over conventional batteries and can demonstrate excellent cycling stability.

An electrode binder of a lithium ion secondary battery comprising an aqueous dispersion of: (a) a polyvinylidene binder; (b) a (meth)acrylic polymer dispersant; (c) a crosslinking agent comprising an aminoplast and/or a polycarbodiimide; and (d) an organic diluent. The (meth)acrylic polymer dispersant is prepared from a mixture of monomers comprising one or more carboxylic acid group-containing (meth)acrylic monomers and one or more hydroxyl group-containing (meth)acrylic monomers, and carboxylic acid groups on the (meth)acrylic polymer dispersant are at least partially neutralized with a base. The binder can be used in the assembly of electrodes of lithium ion secondary batteries.

The present invention provides: a fibrous carbon characterized in that the average effective fiber length is 1-100 μm, and the crystallite length (La) measured using X-ray diffraction is 100-500 nm; an electrode mixture layer for a non-aqueous-electrolyte secondary cell, said mixture comprising an electrode active material and a carbon-based electroconductive auxiliary agent containing said fibrous carbon; an electrode for a non-aqueous-electrolyte secondary cell, the electrode comprising a collector and said electrode mixture layer for a non-aqueous-electrolyte secondary cell, the electrode mixture layer being laminated on the collector; and a non-aqueous-electrolyte secondary cell having said electrode for a non-aqueous-electrolyte secondary cell.

A sensor-on-clamp device for use in a drilling system, the clamp being a tool joint clamp and houses one or more sensors mounted to the tool joint clamp, a power source and sensor data transmitting means. One or more sensors for use in a drilling system, said sensors being powerable by a single commercially available, replaceable battery.

A composite material includes vanadium lithium phosphate, and a conductive carbon. an amount of the conductive carbon is 2.5 mass % or more and 7.5 mass % or less.

Cathodes are provided, wherein at least one of the cathode's active material, binder, or graphite are in the form of carbon-coated particles. Alternatively, rings of the cathode, or the cathode itself, may be coated with carbon. The coating may be as thin as a single layer of carbon. Electrochemical cells comprising such cathodes are also provided. Methods of preparing such cathodes and electrochemical cells are also provided.

Technologies and techniques for the dry manufacture of an electrode. A substrate is provided, and a primer material is dispensed on the substrate to provide a primer layer on the substrate, dispensing an electrode material on the primer layer and attaching the electrode material via pressure and/or temperature to provide an electrode material layer.

Provided are an all-solid-state battery and a preparation method thereof. The all-solid-state battery includes a positive electrode, a negative electrode, and a solid-state electrolyte located between the positive electrode and the negative electrode. The negative electrode includes a first negative electrode and a second negative electrode. The second negative electrode is located on a side of the first negative electrode. The solid-state electrolyte includes a first solid-state electrolyte and a second solid-state electrolyte. The first solid-state electrolyte is located between the positive electrode and the first negative electrode. The second solid-state electrolyte is located between the positive electrode and the second negative electrode. The roughness of the second solid-state electrolyte is greater than the roughness of the first solid-state electrolyte.