A solid-state sodium-carbon dioxide battery is provided. The solid-state sodium-carbon dioxide battery comprises a positive electrode, a negative electrode, and an inorganic solid-state electrolyte disposed between the positive electrode and the negative electrode, wherein the positive electrode can catalyze the reaction of sodium ions and carbon dioxide, the negative electrode comprises sodium.

The invention relates to an electrode material comprising at least one organic redox-active polymer, at least one conductive additive, and polyvinyl butyral as a binder. The electrode material according to the invention makes it possible to manufacture organic batteries having improved charging and discharging capacities. The invention also relates to electrodes comprising the electrode material as well as to batteries comprising the electrodes. The electrode material can also be used for printing electrodes.

Provided is method of preparing an alkali metal cell, the method comprising: (a) combining a quantity of an active material, a quantity of an electrolyte, and a conductive additive to form a deformable and conductive electrode material, wherein the conductive additive, containing conductive filaments, forms a 3D network of electron-conducting pathways and the electrolyte contains an alkali salt and an ion-conducting polymer dissolved or dispersed in a solvent; (b) forming the electrode material into a quasi-solid polymer electrode, wherein the forming includes deforming the electrode material into an electrode shape without interrupting the 3D network of electron-conducting pathways such that the electrode maintains an electrical conductivity no less than 10.sup.6 S/cm; (c) forming a second electrode; and (d) forming an alkali metal cell by combining the quasi-solid electrode and the second electrode. The second electrode may also be a quasi-solid polymer electrode.

One embodiment provides a solid-state battery that has a positive-electrode layer; a negative-electrode layer; and a lithium-ion-conducting solid electrolyte layer disposed between the positive-electrode layer and the negative-electrode layer. The positive-electrode layer contains a positive-electrode active material and a solid electrolyte comprising a hydride of a complex. Said positive-electrode active material is sulfur-based, and the solid electrolyte layer contains a solid electrolyte comprising a hydride of a complex.

One embodiment provides a solid-state battery that has a positive-electrode layer; a negative-electrode layer; and a lithium-ion-conducting solid electrolyte layer disposed between the positive-electrode layer and the negative-electrode layer. The positive-electrode layer contains a positive-electrode active material and a solid electrolyte comprising a hydride of a complex. Said positive-electrode active material is sulfur-based, and the solid electrolyte layer contains a solid electrolyte comprising a hydride of a complex.

A positive electrode active material for an electrochemical device has a fiber shape or a grain-aggregate shape. The positive electrode active material includes an inner core part having a fiber shape or a grain-aggregate shape, and a superficial part covering at least part of the inner core part. The inner core part contains a first conductive polymer, and the superficial part contains a second conductive polymer that is different from the first conductive polymer.

A sulfur-carbon composite including a porous carbon material; a coating layer on a surface of the porous carbon material, the coating layer including a compound with electrolyte solution impregnation property; and sulfur, a method for preparing the same, and a positive electrode for a lithium-sulfur battery and a lithium-sulfur battery including the same are disclosed.

A sulfur-carbon composite including a porous carbon material; a coating layer on a surface of the porous carbon material, the coating layer including a compound with electrolyte solution impregnation property; and sulfur, a method for preparing the same, and a positive electrode for a lithium-sulfur battery and a lithium-sulfur battery including the same are disclosed.

An electrochemical apparatus includes an electrode, the electrode includes a current collector and an active material layer located on one side or two sides of the current collector; where along a thickness direction of the active material layer, the active material layer is divided into four portions, each portion is a detection region, the detection region is subjected to thermogravimetric analysis at a temperature rise rate of 10? C./min in an inert atmosphere, and results of the thermogravimetric analysis show that a weight loss mass percentage of the detection region at 200? C. to 800? C. gradually increases as a distance between the detection region and the current collector decreases in the thickness direction.

An electrochemical apparatus includes an electrode, the electrode includes a current collector and an active material layer located on one side or two sides of the current collector; where along a thickness direction of the active material layer, the active material layer is divided into four portions, each portion is a detection region, the detection region is subjected to thermogravimetric analysis at a temperature rise rate of 10? C./min in an inert atmosphere, and results of the thermogravimetric analysis show that a weight loss mass percentage of the detection region at 200? C. to 800? C. gradually increases as a distance between the detection region and the current collector decreases in the thickness direction.