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Positive electrode active material, positive electrode, battery, and production method for lithium ion secondary battery

A positive electrode active material and secondary battery technology, applied in active material electrodes, electrode manufacturing, secondary batteries, etc., can solve the problem of failing to obtain sufficient discharge capacity, and achieve excellent cycle characteristics and rate characteristics

Inactive Publication Date: 2013-06-26
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As described in Patent Document 3, the cycle characteristics are excellent even at a high operating voltage of 4.5V, but the initial discharge capacity is 191mAh / g or less, and a sufficient discharge capacity cannot be obtained

Method used

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  • Positive electrode active material, positive electrode, battery, and production method for lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] Al 2 o 3 2.98 g of distilled water was added to 7.02 g of an aqueous basic aluminum lactate solution in terms of 8.5% by mass to obtain an aqueous Al solution (composition (1)).

[0119] 1.0 g of the composition (1) was added by spraying to 10 g of the lithium-containing composite oxide of the example, and brought into contact with the lithium-containing composite oxide of the example and the composition (1) while being mixed. Next, after drying the resulting mixture at 90° C. for 2 hours, it was heated at 450° C. for 8 hours in an oxygen-containing atmosphere to obtain the positive electrode active material (A) of Example 1, which was composed of an oxide of Al element (I) Composition of particles (II) concentrated on the surface of the lithium-containing composite oxide.

[0120] The metal element (coating material) aluminum of the composition (1) contained in the positive electrode active material (A) is relative to the sum of the transition metal elements nickel, ...

Embodiment 2～4

[0122] Except that the amount of the sprayed composition (1) is set to 0.5g, 1.5g, and 2.0g respectively, the operation is carried out in the same manner as in Example 1 to obtain positive electrode active materials (B) to (D), and the positive electrode active material ( B) to (D) consist of particles (II) in which the oxide (I) of the Al element is concentrated on the surface of the lithium-containing composite oxide.

[0123] The metal element (coating material) aluminum of the composition (1) contained in the positive electrode active material (B) to (D) is relative to the sum of the transition metal elements nickel, cobalt, and manganese of the lithium-containing composite oxide of the embodiment in moles The ratio (coating amount) {(the number of moles of Al) / (the total number of moles of Ni, Co, and Mn)} was 0.006, 0.019, and 0.025, respectively. The cross sections of the powders of the obtained positive active materials (B) to (D) were embedded with resin, ground with ...

Embodiment 5

[0125] In zirconium content as ZrO 2 Converted to 20.7% by mass of ammonium zirconium carbonate (chemical formula: (NH 4 ) 2 [Zr(CO 3 ) 2 (OH) 2 ]) 3.03 g of distilled water was added to 6.97 g of the aqueous solution to prepare a Zr aqueous solution (composition (2)).

[0126] Next, 1.5 g of the composition (2) was spray-added to 10 g of the lithium-containing composite oxide of the example being stirred, and the lithium-containing composite oxide of the example and the composition (2) were brought into contact while being mixed. Next, after drying the obtained mixture at 90° C. for 2 hours, it was heated at 450° C. for 5 hours in an oxygen-containing atmosphere to obtain a positive electrode active material (E), which was concentrated from an oxide (I) of the Zr element. Particles (II) constitute the surface of the lithium-containing composite oxide.

[0127] The metal element (coating material) zirconium of the composition (2) contained in the positive electrode activ...

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Abstract

The present invention provides a positive electrode active material, a positive electrode, a lithium ion secondary battery, and a method for producing the positive electrode active material, for a lithium ion secondary battery which exhibits superior cycle characteristics and rate characteristics even when charged with high voltage. The invention is characterized by comprising particles (II) in which an oxide (I) of at least one type of a metal element selected from a group consisting of Zr, Ti, and AI is unevenly distributed on the surface of a lithium-containing complex oxide containing Li and at least one type of transition metal element selected from a group consisting of Ni, Co, and Mn (with the proviso that the molar quantity of the Li element is greater than 1.2 times the total molar quantity of the transition metal element or elements).

Description

technical field [0001] The present invention relates to a positive electrode active material for a lithium ion secondary battery, a positive electrode, a lithium ion secondary battery, and a method for manufacturing the positive electrode active material for a lithium ion secondary battery. Background technique [0002] Lithium ion secondary batteries are widely used in portable electronic devices such as cellular phones and notebook computers. LiCoO is used as a positive electrode active material for lithium-ion secondary batteries 2 , LiNiO 2 、LiNi 0.8 co 0.2 o 2 , LiMnO 4 Composite oxides such as lithium and transition metals. Especially with LiCoO 2 Lithium-ion secondary batteries that use carbon such as lithium alloys, graphite, and carbon fibers as negative electrodes as positive electrode active materials are widely used as batteries with high energy density because they can obtain a high voltage of 4 V class. However, in recent years, as lithium-ion secondary...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/36H01M4/505
CPCH01M4/131H01M4/1391H01M4/485H01M4/505H01M4/525H01M10/052H01M2004/028C01G51/50C01G53/50C01P2002/54C01P2006/40C01P2002/52H01M4/366Y02E60/10H01M4/0471H01M4/13H01M4/364H01M4/382H01M10/0525
Inventor 角崎健太郎曾海生
Owner ASAHI GLASS CO LTD
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