Electrode material, method for producing same, and lithium ion secondary battery

Abstract

Secondary batteries for automobiles require good input / output characteristics and low internal resistance. Although there is a conventional technique wherein the surface of an active material is coated with metal particles for the purpose of reducing the internal resistance of a battery, the technique cannot achieve remarkable effects on improvement in the conductivity of the active material or decrease in the internal resistance of the battery since an oxide film is formed on the metal particle surfaces. Disclosed is an electrode material which is produced by mixing and dispersing an active material and a metal source compound, and then depositing metal particles on the surface of the active material by thermal decomposition, vapor phase reduction, liquid phase reduction or a chemical reaction combining any of the thermal decomposition, vapor phase reduction and liquid phase reduction. Since an oxide film is not formed on the metal particles, an electrode material having high conductivity can be obtained. The electrode material can have significant effects on decrease in the internal resistance of a battery and improvement in the input / output characteristics of a battery.

Description

technical field [0001] The present invention relates to an electrode material and a manufacturing method thereof, in particular to an electrode material suitable for a lithium ion secondary battery and a manufacturing method thereof. Background technique [0002] In recent years, the development of hybrid vehicles has been progressing as an environment-friendly vehicle. On the other hand, the non-aqueous lithium ion secondary battery has the characteristics of being able to obtain a high voltage exceeding the electrolysis voltage of water and having a high energy density. Because of such characteristics, utilization of lithium ion secondary batteries in hybrid vehicles has been studied. However, conventional lithium ion secondary batteries have a disadvantage of high internal resistance because active materials constituting electrodes have low conductivity. As an attempt to reduce the internal resistance of a lithium ion secondary battery, a method of mixing a conductive a...

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Problems solved by technology

However, as shown in the description of paragraph [0011], CVD or PVD is described as a problematic existing method, so it is difficult to consider the method such as the atmospheric pressure plasma as plasma CVD, and it is not clear how to specifically use the plasma. clear

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