Cathode active material, cathode, and non-aqueous electrolyte secondary battery

A positive active material, positive electrode technology, applied in non-aqueous electrolyte batteries, active material electrodes, secondary batteries, etc., can solve the problems of capacity deterioration, difficulty in obtaining battery capacity, shortening battery life, etc., to suppress the increase in internal resistance, The effect of excellent charge/discharge cycle characteristics

Active Publication Date: 2009-04-22
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, there is a problem that when charge and discharge are repeated at a large capacity, capacity deterioration occurs and battery life is shortened
There is also the problem that when the battery is used in a high temperature environment, the internal resistance of the battery increases, it is difficult to obtain a sufficient battery capacity, etc.

Method used

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  • Cathode active material, cathode, and non-aqueous electrolyte secondary battery
  • Cathode active material, cathode, and non-aqueous electrolyte secondary battery
  • Cathode active material, cathode, and non-aqueous electrolyte secondary battery

Examples

Experimental program
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Effect test

no. 1 approach

[0039] (1-1) Positive electrode active material

[0040] According to the positive electrode active material used in the secondary battery according to the first embodiment of the present invention, the coating layer contains a halogen element X and at least one selected from Groups 2 to 16 of the periodic table and is different from the compound contained in the matrix particle. The element M, which is a main transition metal element in the oxide particles, is provided on at least a part of the composite oxide particles, and the element M and the halogen element X exhibit different distribution states in the coating layer.

[0041] [Composite oxide particles]

[0042] The composite oxide particle used as the matrix particle is a lithium-containing transition metal oxide containing at least lithium and one or more transition metals, and is not particularly limited as long as it can intercalate and deintercalate lithium. However, from the viewpoint of achieving a large capacit...

no. 2 approach

[0125] (2-1) Positive electrode active material

[0126] As the positive electrode active material, a material similar to the positive electrode active material described in the first embodiment can be used.

[0127] (2-2) Configuration of secondary battery

[0128] Figure 5 The configuration of the secondary battery according to the second embodiment is shown. This secondary battery is a so-called laminated film type secondary battery. The wound electrode member 30 to which the positive electrode lead 31 and the negative electrode lead 32 have been connected is enclosed in a film-shaped case member 40 .

[0129] Each of the positive electrode lead 31 and the negative electrode lead 32 is led from the inside to the outside of the case member 40 in the same direction, for example. The cathode lead 31 is made of, for example, a metal material such as aluminum Al, stainless steel SUS, or the like. The negative electrode lead 32 is made of, for example, a metal material such...

Embodiment 1

[0147] [Preparation of positive electrode]

[0148] The preparation method of the positive electrode active material will be described below. First, lithium cobalt oxide LiCoO with an average diameter equal to 13 μm measured by the laser light scattering method 2 Composite oxide particles used as matrix particles were prepared. Next, as the cladding layer material, manganese carbonate MnCO 3 Weigh and mix into LiCoO 2 The atomic ratio of cobalt Co:manganese Mn=100:2. Next, lithium cobalt oxide LiCoO was synthesized by using mechanochemical equipment 2 and manganese carbonate MnCO 3 The mixed powders were treated for 1 h and treated with MnCO 3 Coated Lithium Cobalt Oxide LiCoO 2 surface, thus forming a roasted precursor. The temperature of the fired precursor was increased at a rate of 3 °C / min. The calcined precursor was heat-treated at 900 °C for 3 hours, and then cooled in order to obtain a uniform distribution of manganese Mn in lithium cobalt oxide LiCoO 2 parti...

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Abstract

The invention provides a cathode active material, a cathode, and a non-aqueous electrolyte secondary battery. The cathode active material has: a composite oxide particle containing at least lithium and one or a plurality of transition metals; and a coating layer provided on at least a part of the composite oxide particle. The coating layer contains at least one kind of element M differing from a main transition metal element A forming the composite oxide particle and selected from Groups 2 to 16 of the periodic table and a halogen element X. In the coating layer, the element M and the halogen element X exhibit different distribution states. It is, therefore, desirable to provide a cathode active material, a cathode, and a non-aqueous electrolyte secondary battery in which a large capacitance and excellent charge/discharge cycle characteristics are obtained and an increase in internal resistance can be suppressed.

Description

[0001] Cross References to Related Applications [0002] The present invention contains subject matter related to Japanese Patent Application JP 2007-272929 filed in the Japan Patent Office on Oct. 19, 2007, the entire content of which is hereby incorporated by reference. field of invention [0003] The present invention relates to a positive electrode active material, a positive electrode, and a nonaqueous electrolyte secondary battery, and more particularly, to a positive electrode active material, a positive electrode, and a nonaqueous electrolyte secondary battery including a composite oxide containing, for example, lithium and a transition metal. Background technique [0004] In recent years, the technology of portable electronic devices has been remarkably developed and electronic devices such as portable phones, notebook computers, etc. have begun to be considered as fundamental technologies supporting the past information world. Research and development to realize ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/02H01M10/36H01M10/40H01M4/525H01M10/052
CPCY02E60/122H01M4/582H01M4/366H01M4/485Y02E60/10
Inventor 细谷洋介
Owner MURATA MFG CO LTD
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