The present application relates to a secondary battery and an electrode member thereof. The electrode member includes an insulating substrate, a conducting layer and an active material layer. The conducting layer is provided on a surface of the insulating substrate, and the conducting layer includes a main portion and a protruding portion extending from the main portion, the main portion is coated with the active material layer, the protruding portion is not coated with the active material layer. The active material layer includes a first portion and a second portion, the first portion is positioned at an end of the active material layer away from the protruding portion, the second portion is positioned at a side of the first portion close to the protruding portion, and a thickness of the first portion is less than a thickness of the second portion.

In an embodiment, a metal or metal-ion battery cell, includes anode and cathode electrodes, a separator electrically separating the anode and the cathode, and a solid electrolyte ionically coupling the anode and the cathode, wherein the solid electrolyte comprises a material having one or more rearrangeable chalcogen-metal-hydrogen groups that are configured to transport at least one metal-ion or metal-ion mixture through the solid electrolyte, wherein the solid electrolyte exhibits a melting point below about 350° C. In an example, the solid electrolyte may be produced by mixing different dry metal-ion compositions together, arranging the mixture inside of a mold, and heating the mixture while arranged inside of the mold at least to a melting point (e.g., below about 350° C.) of the mixture so as to produce a material comprising one or more rearrangeable chalcogen-metal-hydrogen groups.

Various examples provide a secondary battery having a positive electrode terminal-and-membrane integrated cap plate, which can cut off a charging current in an overcharge mode by integrating a positive electrode terminal and a membrane into the cap plate, and can cut off a short-circuit current in an external short-circuit mode by placing a fuse in a region of the membrane connected to the current collector plate. In one example embodiment, the secondary battery may include a case having an opening, an electrode assembly housed in the opening of the case housed in the opening of the case, and a cap plate coupled to the opening of the case, wherein the cap plate may include a terminal portion integrated into the cap plate, and a membrane integrated into the terminal portion to be electrically connected to the electrode assembly.

A lithium secondary battery includes: a positive electrode; a negative electrode including a negative electrode collector having a surface, on which a lithium metal is deposited during charge; a separator disposed between the positive electrode and the negative electrode; and a nonaqueous electrolyte solution filled between the positive electrode and the negative electrode. The negative electrode collector includes projection portions projecting from the surface toward the separator. There is no projection portion on an imaginary line extending from a first end to a second end opposite to the first end of the surface of the negative electrode collector and traversing a space between the projection portions.

A lithium secondary battery includes: a positive electrode; a negative electrode; a separator disposed between the positive electrode and the negative electrode; and a nonaqueous electrolyte solution filled between the positive electrode and the negative electrode. The negative electrode includes: an electrically conductive layer having a surface; and lithium metal pieces arranged spaced from each other on the surface of the electrically conductive layer. There is no lithium metal on an imaginary line extending from a first end to a second end opposite to the first end of the surface of the electrically conductive layer and traversing a space between the lithium metal pieces.

An electrolytic solution for an electrochemical device including a magnesium electrode as a negative electrode is provided. The electrolytic solution includes a linear ether solvent. The linear ether solvent includes a first magnesium salt having a disilazide structure represented by a general formula (R.sub.3Si).sub.2N where R represents a hydrocarbon radical with one or more and ten or less carbon atoms and a second magnesium salt without the disilazide structure.

Provided is an electrolytic solution for an electrochemical device including a magnesium electrode as a negative electrode. The electrolytic solution includes a solvent including a linear ether and a magnesium salt. In the electrolytic solution, the linear ether has two or more ethyleneoxy structural units.

A lithium battery structure is provided. The lithium battery structure includes a first metal layer including aluminum foil or stainless steel foil, a second metal layer including copper foil, nickel foil or stainless steel foil, a separator, a first electrode layer, a second electrode layer, and a first functional layer including a first composition. The separator is disposed between the first metal layer and the second metal layer. The first electrode layer is disposed between the first metal layer and the separator. The second electrode layer is disposed between the second metal layer and the separator. The first functional layer is disposed between the first metal layer and the first electrode layer. The first composition includes 20-80 parts by weight of flake conductive material, 1-30 parts by weight of spherical conductive material, 10-50 parts by weight of thermoplastic elastomer and 1-25 parts by weight of nitrogen-containing hyperbranched polymer.

An electrochemical battery cell comprising an anode having a primary anode active material, a cathode, and an ion-conducting electrolyte, wherein the cell has an initial output voltage, Vi, measured at 10% depth of discharge (DoD), selected from a range from 0.3 volts to 0.8 volts, and a final output voltage Vf measured at a DoD no greater than 90%, wherein a voltage variation, (Vi−Vf)/Vi, is no greater than ±10% and the specific capacity between Vi and Vf is no less than 100 mAh/g or 200 mAh/cm.sup.3 based on the cathode active material weight or volume, and wherein the primary anode active material is selected from lithium (Li), sodium (Na), potassium (K), magnesium (Mg), aluminum (Al), zinc (Zn), titanium (Ti), manganese (Mn), iron (Fe), vanadium (V), cobalt (Co), nickel (Ni), a mixture thereof, an alloy thereof, or a combination thereof.

One or more interfacial layers in contact with a solid-state electrolyte and hybrid electrolyte materials. Interfacial layers comprise inorganic (e.g., metal oxides and soft inorganic materials) or organic materials (e.g., polymer materials, gel materials and ion-conducting liquids). The interfacial layers can improve the electrical properties (e.g., reduce the impedance) of an interface between an a cathode and/or anode and a solid-state electrolyte. The interfacial layers can be used in, for example, solid-state batteries (e.g., solid-state, ion-conducting batteries).