The present disclosure relates to an invention directed to a composite separator having a porous coating layer, where the porous coating layer is prepared from a slurry by adjusting a particle diameter of an inorganic matter that is an ingredient of the slurry, so that a sinking rate of the inorganic particles may remarkably slow down and dispersibility may be dramatically improved, and as a result, the content of the inorganic particles may relatively increase and the inorganic particles may be uniformly distributed in the coating layer on a substrate, thereby preventing a reduction in battery performance.

Provided herein are positive electrodes for lithium batteries, particularly lithium sulfur batteries, and the manufacture thereof. Particularly, such electrodes have good performance characteristics, such as capacity and capacity retention, even at very high loading of sulfur (e.g., >5 mg/cm2), as well as flexibility. Exemplary manufacturing techniques include the electrospraying of sulfur (e.g., electrode active sulfur compounds), and an optional additive (e.g., a nanostructured conductive additive), onto a porous, conductive substrate (e.g., a porous carbon substrate, such as comprising multiple layers and/or domains).

Provided herein are positive electrodes for lithium batteries, particularly lithium sulfur batteries, and the manufacture thereof. Particularly, such electrodes have good performance characteristics, such as capacity and capacity retention, even at very high loading of sulfur (e.g., >5 mg/cm2), as well as flexibility. Exemplary manufacturing techniques include the electrospraying of sulfur (e.g., electrode active sulfur compounds), and an optional additive (e.g., a nanostructured conductive additive), onto a porous, conductive substrate (e.g., a porous carbon substrate, such as comprising multiple layers and/or domains).

Provided are compositions and methods of making and using free-standing electrode films for electrodes by processes that improve upon prior dry process fabrication techniques. Processes are provided for forming an initial free standing film. The initial free standing film is then compressed into an electrode film in the presence of a liquid processing aid whereby the presence of the liquid processing aid reduces the number of roll mill passes to achieve a robust electrode film suitable for use in an electrode with relatively increased film porosity and mechanical strength.

The present invention relates to an electrode structure for a secondary battery comprising a potential sheath capable of suppressing a side reaction between an electrode and an electrolyte through electric potential control, and a method for manufacturing the same. The electrode structure for the secondary battery according to the present invention uses the electric potential control so that an unstable SEI layer, which causes decrease in cycle characteristic and capacity of an anode material, occurs only on the surface of a potential sheath without occurring on the surface of the anode active material, thereby being capable of completely solving the problems of the existing nanostructured electrode.

The electrode structure of the present invention exhibits very excellent cycle performance that is difficult to predict from the conventional nanowire electrode structure by virtue of a synergistic effect of the potential sheath and the nanowire anode active material, and has an effect that is stable upon charging and discharging with high rate and can exert stable performance even if small cracks occur on the potential sheath.

The present invention relates to an electrode structure for a secondary battery comprising a potential sheath capable of suppressing a side reaction between an electrode and an electrolyte through electric potential control, and a method for manufacturing the same. The electrode structure for the secondary battery according to the present invention uses the electric potential control so that an unstable SEI layer, which causes decrease in cycle characteristic and capacity of an anode material, occurs only on the surface of a potential sheath without occurring on the surface of the anode active material, thereby being capable of completely solving the problems of the existing nanostructured electrode.

The electrode structure of the present invention exhibits very excellent cycle performance that is difficult to predict from the conventional nanowire electrode structure by virtue of a synergistic effect of the potential sheath and the nanowire anode active material, and has an effect that is stable upon charging and discharging with high rate and can exert stable performance even if small cracks occur on the potential sheath.

A sulfur-carbon composite and a lithium secondary battery including the same are discussed. More specifically, a network-shaped coating layer including a conductive polymer is formed on a surface of the sulfur-carbon composite, and thus the conductivity of the sulfur-carbon composite is enhanced and also, lithium ions move freely, and accordingly, when applied to lithium secondary batteries, the sulfur-carbon composite can enhance the performance of batteries.

A vanadium sodium phosphate positive electrode material, a sodium ion battery, and a preparation method therefor and application thereof. The preparation method of the vanadium sodium phosphate positive electrode material comprises the following steps: (1) reacting an aqueous solution containing a vanadium source with a phosphorus source, a reducing agent, a sodium source, and a carbon source, the reaction comprising first performing a reaction of an aqueous solution of the vanadium source and the phosphorus source, and then perform a reaction with the reducing agent, or first performing a reaction of the aqueous solution of the vanadium source with the reducing agent and then performing a reaction with the phosphorus source; (2) drying and calcining the reaction liquid obtained in step (1). The vanadium sodium phosphate positive electrode material has a high dispersibility, and has stable circulation performance when used in a battery.

The present disclosure provides a negative electrode material that can improve the charge-discharge efficiency of a battery. A negative electrode material includes a reduced form of a first solid electrolyte material and a conductive auxiliary. The first solid electrolyte material is denoted by Formula (1): Li.sub.60 M.sub.βX.sub.γ. Herein, in Formula (1), each of α, β, and γ is a value greater than 0, M represents at least one element selected from the group consisting of metal elements except Li and semimetals, and X represents at least one element selected from the group consisting of F, Cl, Br, and I.

A negative electrode active material for a secondary battery includes silicate composite particles each of which contain a silicate phase and silicon particles dispersed in the silicate phase, the silicate phase is an oxide phase containing Si, O, and alkali metals, the alkali metals include at least Na and Li, and an atomic ratio: Na/Li of Na to Li is 0.1 to 7.1.