The present invention provides a method for preparing an anode active material for a nonaqueous lithium secondary battery, comprising the steps of: preparing a carbon-based material; forming a precursor coating layer comprising Me and A (wherein A is O or S) on the surface of the carbon-based material; supplying a P precursor to the precursor coating layer of the carbon-based material; and converting at least a part of the precursor coating layer into a compound represented by Me.sub.x1P.sub.y1 (wherein x1>0 and y1>0) by the reaction of the precursor coating layer and the P precursor, thereby forming a phosphide coating layer, wherein Me is at least one type of the same metal element selected from among Mo, Ni, Fe, Co, Ti, V, Cr, Nb and Mn.

A liquid composition for an electrode composite material is provided. The liquid composition comprises an active material, a dispersion medium, and a polymerizable compound. A viscosity of the liquid composition at 25 degrees C. is a viscosity at which the liquid composition is dischargeable from a liquid discharge head.

Disclosed is a method of preparing a negative electrode active material which includes (a) dispersing an active material core in a solution containing a surfactant to coat the surfactant on the active material core, (b) adding and dispersing a first precursor, which is bondable with the surfactant by electrostatic attraction, in the solution, (c) adding and dispersing a second precursor, which is bondable with the first precursor by electrostatic attraction, in the solution, (d) preparing a lithium compound precursor by a hydrothermal reaction of the first precursor and the second precursor in the solution, and (e) performing a heat treatment on the lithium compound precursor to thermally decompose the surfactant, and forming a protective layer containing a lithium compound on the active material core, wherein one of the first precursor and the second precursor is at least one selected from lithium hydroxide, lithium oxide, lithium nitrate or lithium sulfate.

Filled carbon nanotubes (CNTs), methods of synthesizing the same, and lithium-ion batteries comprising the same are provided. In situ methods (e.g., chemical vapor deposition techniques) can be used to synthesize CNTs (e.g., multi-walled CNTs) filled with metal sulfide nanowires. The CNTs can be completely (or nearly completely) and continuously (or nearly continuously) filled with the metal sulfide fillers up to several micrometers in length. The filled CNTs can be synthesized on a carbon substrate. A lithium-ion battery can comprise a cathode, an anode comprising filled CNTs as described herein, and an electrolyte in contact with the cathode and/or the anode.

The present invention relates to a preparation method of a carbon quantum dot/carbon coated VSe.sub.2 composite material (VSe.sub.2@CQD), and belongs to the technical field of electrode material of a potassium ion battery and preparation thereof. By compositing the carbon, carbon quantum dots and vanadium diselenide (VSe.sub.2), the three components generate a synergistic effect. The carbon quantum dot/carbon coating can improve the electronic conductivity and lithium ion diffusion rate of the material, and also can inhibit the agglomeration of the vanadium diselenide (VSe.sub.2). Therefore, the prepared carbon quantum dot/carbon coated VSe.sub.2 composite material (VSe.sub.2@CQD) has excellent electrochemical performance and excellent rate performance and cycle stability. The method is simple in process, low in cost, environment-friendly, and suitable for large-scale industrial production.

This application relates to nanostructured materials, such as nanoparticles, comprising anion-functionalized conductive polymers and methods of making same. The nanostructures may be used as electrode materials for secondary batteries or other energy storage devices.

A nonaqueous electrolyte secondary battery is provided which is suppressed in capacity deterioration upon repeating charging and discharging irrespective of cracks being formed in a lithium manganese oxide particle having a spinel type crystal structure. The nonaqueous electrolyte secondary battery herein disclosed includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes lithium manganese oxide particles having a spinel type crystal structure as the positive electrode active material. At least a part of the lithium manganese oxide particles has a cracked part. The lithium manganese oxide particles have a coating film on the particle surface including the surface of the cracked part. The coating film contains a P component including a LiMnPO.sub.4 component, and a F component.

A process to prepare an electrode for an electrochemical storage device by spraying an aqueous slurry composition comprising water, xanthan gum, a source of conducting carbon particles and an active material on an electrode base. The slurry may be made by first mixing solid xanthan gum with the conducting carbon particles and the active material and secondly adding water to the resulting mixture. Alternatively the slurry is obtained by mixing solid xanthan gum with a carbon-based active material and adding water to the resulting mixture obtained.

A process to prepare an electrode for an electrochemical storage device by spraying an aqueous slurry composition comprising water, xanthan gum, a source of conducting carbon particles and an active material on an electrode base. The slurry may be made by first mixing solid xanthan gum with the conducting carbon particles and the active material and secondly adding water to the resulting mixture. Alternatively the slurry is obtained by mixing solid xanthan gum with a carbon-based active material and adding water to the resulting mixture obtained.

A negative electrode active material including a core, an intermediate layer on a surface of the core, and a shell layer on a surface of the intermediate layer, wherein the core includes a silicon oxide of SiO.sub.x (0<x<2); the intermediate layer includes a lithium silicate, the shell layer includes lithium fluoride (LiF) and the intermediate layer is present in an amount of 5 wt %-15 wt % based on a total weight of the negative electrode active material. Also, a method for preparing the negative electrode active material, and a negative electrode and lithium secondary battery including the same. The negative electrode active material provides excellent initial efficiency and life characteristics.