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Positive electrode active material, positive electrode, and nonaqueous electrolyte cell

A positive active material and oxide technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, active material electrodes, etc., can solve the problems of capacity degradation, shortened battery life, high charging voltage, etc., and achieves degradation inhibition, excellent Charge-discharge cycle characteristics, effect of high battery capacity

Active Publication Date: 2015-05-06
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Lithium-ion secondary batteries have a high charging voltage compared with other battery systems, however, lithium-ion secondary batteries have a problem that their capacity will not be Will deteriorate, resulting in shortened battery life
In addition, when a lithium-ion secondary battery is used in a high-temperature environment, an increase in internal resistance occurs, which may prevent it from achieving sufficient capacity

Method used

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  • Positive electrode active material, positive electrode, and nonaqueous electrolyte cell
  • Positive electrode active material, positive electrode, and nonaqueous electrolyte cell
  • Positive electrode active material, positive electrode, and nonaqueous electrolyte cell

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0023] 1. First embodiment (example of cylindrical non-aqueous electrolyte secondary battery)

[0024] 1. The first embodiment

[0025] (1-1) About the positive electrode active material of the present invention

[0026] Regarding the stability of the state of charge of the battery, it is considered that lithium cobalt oxide (LiCoO 2 ) And lithium nickelate (LiNiO 2 The lithium-containing transition metal oxide of) has the following problems:

[0027] (a) The reactivity at the interface between the positive electrode active material and the electrolyte is increased, so that the transition metal component is eluted from the positive electrode, thereby causing activity due to the crystallization of the eluted metal on the negative electrode side Deterioration of the substance and / or hindrance to the deintercalation of intercalated lithium; and

[0028] (b) The decomposition reaction of the electrolyte at the interface is accelerated, thereby causing deterioration of battery characteristi...

Embodiment 1

[0097] [Manufacture of positive electrode]

[0098] First, the average particle diameter of 13μm lithium cobalt oxide (LiCoO 2 ) And magnesium carbonate (MgCO 3 ) Weighing to obtain an atomic ratio Co:Mg=99:1 (M1 / (M1+A)=0.01) and mixing. The mixture was then treated with a mechanochemical device for 1 hour, so that magnesium carbonate was deposited on the surface of the lithium cobaltate particles used as the center material to form a pre-sintered precursor.

[0099] Next, the pre-sintered precursor was heated at a rate of 3°C / min, kept at 900°C for 3 hours, and slowly cooled to obtain particles with magnesium (Mg) uniformly distributed on the surface of the lithium cobaltate particles. The particles thus obtained were pulverized to have an average particle diameter of 0.8 μm lithium phosphate (Li 3 PO 4 ) To obtain the atomic ratio Co:Li(LiCoO 2 The excess Li)=98:2 (M2 / (M2+A)=0.02) is mixed, and the resulting mixture is mixed and stirred at high speed to obtain the lithium-transit...

Embodiment 2

[0116] A cylindrical battery was manufactured in the same manner as in Example 1, except that by using aluminum hydroxide (Al(OH) 3 ) Instead of magnesium carbonate (MgCO 3 ) And in which aluminum (Al) is uniformly distributed on the surface of the lithium cobalt oxide particles, and the lithium cobalt oxide and aluminum hydroxide are combined to obtain the atomic ratio Co:Al=99:1 (M1 / (M1+ A)=0.01). The cylindrical battery was evaluated in the same manner as in Example 1.

[0117] When the powder obtained in Example 2 was observed by SEM / EDX, it was confirmed that aluminum was uniformly distributed on the entire surface of the lithium-transition metal composite oxide particles. In addition, similar to Example 1, it was confirmed that lithium phosphate was present in a state of being deposited on the surface of lithium-transition metal composite oxide particles, or between the particles.

[0118] In addition, the powder obtained in Example 2 was subjected to the measurement of the ...

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Abstract

Disclosed herein is a positive electrode active material wherein at least one metallic element M1 different from a principal transition metal element A is present at least at part of a surface of a lithium-containing transition metal oxide containing the principal transition metal element A, and, further, a compound of a metallic element M2 different from the metallic element M1 is present in a coating manner or in the vicinity of the lithium-containing transition metal oxide.

Description

[0001] Reference to related applications [0002] This application contains the subject matter disclosed in Japanese priority patent application JP 2009-172968 filed with the Japan Patent Office on July 24, 2009, the entire contents of which are incorporated herein by reference. Technical field [0003] The present invention relates to a positive electrode and a non-aqueous electrolyte secondary battery, and in particular, to a non-aqueous electrolyte battery and positive electrode activity that can ensure high capacity and excellent charge-discharge cycle characteristics and hardly deteriorate the performance during use in a high-temperature environment Substance and positive electrode. Background technique [0004] Due to the remarkable progress of mobile electronic technology in recent years, it has been recognized that electronic devices such as mobile phones and notebook computers have become basic technologies for making an advanced information society. In addition, efforts h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/13H01M10/05
CPCH01M4/366H01M4/485H01M10/0525H01M2004/028Y02E60/10H01M4/48H01M4/505H01M4/525H01M4/58
Inventor 藤木聪细谷洋介森田耕诗
Owner MURATA MFG CO LTD