A method for forming a connection such as an electrical connection, to a fibre material electrode element comprises moving a length of the fibre material relative to a pressure injection stage and pressure impregnating by a series of pressure injection pulses a lug material into a lug zone part of the fibre material to surround and/or penetrate fibres of the fibre material and form a lug strip in the lug zone. The fibre material may be a carbon fibre material and the lug material a metal such as Pb or a Pb alloy. Apparatus for forming an electrical connection to a fibre material electrode element is also disclosed.

A manufacturing method of an electrode assembly includes: forming an active material compact containing a lithium double oxide and having a plurality of voids; forming a first solid electrolyte in the plurality of voids; impregnating a precursor solution of a second amorphous solid electrolyte conducting lithium ions with an active material compact in which the first solid electrolyte is formed; and performing heat treatment of the active material compact with which the precursor solution is impregnated and forming a second solid electrolyte in the plurality of voids.

An electrode assembly includes a composite body which includes an active material layer containing an active material constituted by a transition metal oxide, a solid electrolyte layer (solid electrolyte portion) containing a solid electrolyte, and a multiple oxide molded body (multiple oxide portion) containing at least one of a metal multiple oxide represented by the following general formula (1): Ln.sub.2Li.sub.0.5M.sub.0.5O.sub.4 (wherein Ln represents a lanthanoid, and M represents a transition metal) and a derivative thereof, and a current collector which is provided on one face (one of the faces) of the composite body by being bonded to the active material layer, wherein in the composite body, the multiple oxide molded body, the active material layer, and the solid electrolyte layer are formed in contact with each other in this order from the side of the one face of the composite body.

The present disclosure relates to a negative electrode for a secondary battery that is improved in the peeling resistance and adhesiveness of the active material layer and thus can improve the life characteristics of the negative electrode and the lithium secondary battery, a method of manufacturing the same and a lithium secondary battery including same. The negative electrode for a secondary battery includes a metal current collector; and an active material layer formed on the metal current collector and containing a negative electrode active material, a binder, and a conductive material, wherein the active material layer has an average value of shear strength of 1.6 MPa or more as measured at a predetermined depth.

According to a system and method for evaluating the dissolution quality of a binder solution for a secondary battery electrode, by preparing an electrode slurry with a binder solution having a predetermined amount or more of cumulative filtration amount or a predetermined level or less of flow rate reduction rate, the quality of an electrode for a secondary battery may be improved.

Disclosed is a method for producing a lithium secondary battery including forming an electrode assembly using a cathode, an anode and a separator, introducing the electrode assembly into a battery case, injecting an electrolyte into the battery case, and sealing the battery case, wherein, during assembly of the electrode assembly, insulating particles are dispersed on part of the surface of the separator, or at least one of the cathode and the anode contacting the separator. The step of dispersing insulating particles on the part of the surface of the separator or at least one of the cathode and the anode contacting the separator during battery assembly can considerably reduce short-circuits in a lithium secondary battery caused by intrinsic and extrinsic factors and thus low-voltage defects, and thereby significantly improve yield of a lithium secondary battery.

An anode active material layer for a lithium battery, the layer comprising multiple anode active material particles and a conductive additive that are protected by (embedded in and bonded by) a matrix resin comprising an ion-conducting elastomer or rubber having a recoverable tensile strain from 5% to 700% when measured without an additive or reinforcement in the polymer and a lithium ion conductivity no less than 10.sup.−6 S/cm at room temperature. The amount of conductive additive is preferably sufficient to form a 3D network of electron-conducing pathways that are in electrical contact with the anode material particles. Such an elastomeric or rubbery matrix also acts to maintain the structural integrity of the anode electrode, preventing interruption of the electron- and lithium ion-conducting pathways when the anode active material particles repeatedly expand and shrink in volume during battery cycling.

Provided herein are energy storage devices high energy and power densities, cycle life, and safety. In some embodiments, the energy storage device comprise a non-flammable electrolyte that eliminate and/or reduce fire hazards for improved battery safety, with improved electrode compatibility with electrode materials.

Composites of silicon and various porous scaffold materials, such as carbon material comprising micro-, meso- and/or macropores, and methods for manufacturing the same are provided. The compositions find utility in various applications, including electrical energy storage electrodes and devices comprising the same.

Particulate dispersions and composites are disclosed which comprise graphite and alloy particles comprising both active (e.g. Si) and inactive phases with regards to electrochemical activity with alkali or alkaline earth metals (e.g. lithium). The alloy particles are highly dispersed as primary particles with graphite particles and/or within the graphite particles' matrix in a novel manner and can be prepared using simple mechanofusion dry processing methods. In the composites prepared, the alloy particles are essentially embedded between layers in the graphite matrix. Improved performance can be obtained when these dispersions or composites are used in lithium insertion anodes for rechargeable lithium batteries, including high capacity, good cycling performance, and rate capability.