A flexible Zn film electrode with ionic and electronic networks has been designed by utilizing ionic liquid based gel polymer as the binder, which can minimize the interface resistance between electrode and electrolytes. Ionic liquid electrolytes are good candidates for high surface area Zn anode due to their good electro(chemical) stability. Ionic liquid based gel polymer electrolytes (GPEs) are good candidates to replace liquid electrolytes or separators in some special applications, like surface coating structure batteries.

A versatile high throughput deposition apparatus includes a process chamber and a workpiece platform in the process chamber. The workpiece platform can hold a plurality of workpieces around a center region and to rotate the plurality of workpieces around the center region. Each of the plurality of workpieces includes a deposition surface facing the center region. A gas distribution system can distribute a vapor gas in the center region of the process chamber to deposit a material on the deposition surfaces on the plurality of workpieces. A magnetron apparatus can form a closed-loop magnetic field near the plurality of workpieces. The plurality of workpieces can be electrically biased to produce a plasma near the deposition surfaces on the plurality of workpieces.

A silicon-based negative electrode material, a preparation method therefor and a use thereof in a lithium-ion battery. The silicon-based negative electrode material comprises a silicon-based active material and a composite layer that coats the surface of the silicon-based active material and composes a flexible polymer, flake graphite and a conductive material. The method comprises: 1) dissolving the flexible polymer in a solvent; 2) adding the flake graphite and the conductive material into the flexible polymer solution obtained in step 1) while stirring; 3) adding an anti-solvent to the mixed coating solution obtained in step 2) and stirring; 4) adding the silicon-based active material to the supersaturated mixed coating solution obtained in step 3) while stirring, and then stirring and separating; and 5) carrying out thermal treatment to obtain the silicon-based negative electrode material.

The present invention relates to a method of preparing a negative electrode active material which includes forming a mixture by mixing Li.sub.2O and SiO.sub.x(0<x<2) particles including SiO.sub.2, forming a reaction product by performing a heat treatment on the mixture at 400° C. to 600° C., and removing a portion of lithium silicate in the reaction product by washing the reaction product.

The present invention relates to a method of preparing a negative electrode active material which includes forming a mixture by mixing Li.sub.2O and SiO.sub.x(0<x<2) particles including SiO.sub.2, forming a reaction product by performing a heat treatment on the mixture at 400° C. to 600° C., and removing a portion of lithium silicate in the reaction product by washing the reaction product.

A method for manufacturing a lithium secondary battery, including the steps: (S1) forming a preliminary negative electrode by coating a negative electrode slurry including a negative electrode active material, conductive material, binder and a solvent onto at least one surface of a current collector, followed by drying and pressing the negative electrode slurry coated current collector, to form a negative electrode active material layer surface on the current collector; (S2) coating lithium metal foil onto the negative electrode active material layer surface of the preliminary negative electrode in the shape of a pattern in which pattern units are arranged; (S3) cutting the preliminary negative electrode on which the lithium metal foil is pattern-coated to obtain negative electrode units; (S4) impregnating the negative electrode units with an electrolyte to obtain a pre-lithiated negative electrode; and (S5) assembling the negative electrode obtained from step (S4) with a positive electrode and a separator.

An electrode including an electrode active material including lithium (Li) and a polymer layer coating at least a portion of the electrode active material is provided. The polymer layer includes a polymerization product of a monomer having Formula I: ##STR00001##
where R.sub.1 and R.sub.2 are independently an aryl or a branched or unbranched C.sub.1-C.sub.10 alkyl and X.sub.1 and X.sub.2 are independently chlorine (Cl), bromine (Br), or iodine (I).

The present application provides a silicon-oxygen composite negative electrode material and a preparation method therefor, and a lithium ion battery. The silicon-oxygen composite negative electrode material has a core-shell structure, the core comprises nano-silicon and a silicon oxide SiO.sub.x, and the shell comprises Li.sub.2SiO.sub.3. The preparation method comprises: mixing a silicon source and a lithium source, and performing heat treatment in a non-oxygen atmosphere to obtain a composite material containing Li.sub.2SiO.sub.3; and immersing the composite material containing Li.sub.2SiO.sub.3 in an acid solution to obtain the silicon-oxygen composite negative electrode material. The nano-silicon in the negative electrode material provided by the present application is wrapped by SiO.sub.x, and the surface of SiO.sub.x is further wrapped with the Li.sub.2SiO.sub.3 having a stable structure, making it difficult for the nano-silicon to come into physical contact with substances other than the SiO.sub.x and impossible to come into direct contact with water, thereby effectively inhibiting gas production of a battery.

The present application provides a silicon-oxygen composite negative electrode material and a preparation method therefor, and a lithium ion battery. The silicon-oxygen composite negative electrode material has a core-shell structure, the core comprises nano-silicon and a silicon oxide SiO.sub.x, and the shell comprises Li.sub.2SiO.sub.3. The preparation method comprises: mixing a silicon source and a lithium source, and performing heat treatment in a non-oxygen atmosphere to obtain a composite material containing Li.sub.2SiO.sub.3; and immersing the composite material containing Li.sub.2SiO.sub.3 in an acid solution to obtain the silicon-oxygen composite negative electrode material. The nano-silicon in the negative electrode material provided by the present application is wrapped by SiO.sub.x, and the surface of SiO.sub.x is further wrapped with the Li.sub.2SiO.sub.3 having a stable structure, making it difficult for the nano-silicon to come into physical contact with substances other than the SiO.sub.x and impossible to come into direct contact with water, thereby effectively inhibiting gas production of a battery.

This power storage device uses a negative electrode active material layer which contains a negative electrode active material containing silicon-based particles and a polyimide-based binder, wherein the negative electrode active material layer has a porosity of less than 20%. This power storage device has a high charge/discharge capacity and excellent cycle characteristics.