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Method for producing positive electrode active material for lithium ion secondary batteries

A positive active material, secondary battery technology, applied in battery electrodes, lithium storage batteries, chemical instruments and methods, etc., can solve problems such as insufficient discharge capacity, achieve reduction in initial capacity, improve cycle characteristics, and high durability. sexual effect

Inactive Publication Date: 2013-10-09
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Patent Document 2, like the above-mentioned Patent Document 1, cannot obtain a sufficient discharge capacity.

Method used

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  • Method for producing positive electrode active material for lithium ion secondary batteries
  • Method for producing positive electrode active material for lithium ion secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] (Example 1)

[0129] In manganese acetate 4-hydrate (chemical formula: Mn(CH 3 COO) 2 ·4H 2 O, molecular weight: 245.09) 17.8 g of distilled water was added to 7.2 g to prepare a pH 7.0 Mn solution (composition (1)).

[0130] Next, with respect to 15 g of the lithium-containing composite oxide of the example being stirred, 3.6 g of the prepared Mn aqueous solution was spray-added, and the lithium-containing composite oxide of the example and the Mn aqueous solution were mixed and brought into contact. Next, the resulting mixture was heated at 600° C. for 3 hours in an oxygen-containing atmosphere to obtain the positive electrode active material of Example 1. The positive electrode active material is composed of an oxide containing Mn element more present on the surface of the lithium-containing composite oxide. Particle composition.

[0131] In the positive electrode active material, the manganese coated with the Mn aqueous solution is calculated as {(coated Mn) in molar rat...

Embodiment 6

[0135] (Example 6)

[0136] Except that the coating conditions of the manganese compound on the surface of the lithium-containing composite oxide were set to the conditions shown in Table 1 below using a mixed solution of manganese acetate and nickel acetate, the positive electrode activity was obtained by the same procedure as in Example 1 above. substance. Here, {(Total number of moles of coated Mn and Ni) / (Total number of moles of Ni, Co and Mn of lithium-containing composite oxide before application)}=0.03, and the molar ratio of coated Mn to Ni is Mn: Ni=75:25.

Embodiment 7

[0137] (Example 7)

[0138] Except that the coating conditions of the manganese compound on the surface of the lithium-containing composite oxide were set to the conditions shown in Table 1 below using a mixed solution of manganese acetate, nickel acetate, and cobalt acetate, the same procedure as in Example 1 was performed. The positive electrode active material is obtained. Here, {(Total number of moles of Ni, Co, Mn to be coated) / (Total number of moles of Ni, Co, and Mn of lithium-containing composite oxide before application)}=0.03, the moles of coated Mn, Ni, and Co The ratio is Mn:Ni:Co=65:25:10.

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Abstract

Provided are: a method for producing a positive electrode active material for lithium ion secondary batteries, which has excellent discharge capacity, excellent cycle characteristics and high durability; a lithium ion secondary battery; and a method for producing a positive electrode for lithium ion secondary batteries. A positive electrode active material for lithium ion secondary batteries is produced by bringing a lithium-containing complex oxide, which contains Li element and at least one transition metal element selected from the group consisting of Ni, Co and Mn (provided that the molar amount of the Li element is more than 1.2 times the total molar amount of the transition metal element(s)), into contact with a composition (1) (a composition that is obtained by dissolving or dispersing a compound (1), which essentially contains Mn element but does not contain Li element, in a solvent) and heating the resulting.

Description

Technical field [0001] The present invention relates to a method for manufacturing a positive electrode active material for lithium ion secondary batteries. In addition, the present invention relates to a method for manufacturing a positive electrode for a lithium ion secondary battery and a lithium ion secondary battery using the positive electrode active material. Background technique [0002] Lithium ion secondary batteries are widely used in portable electronic devices such as mobile 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 , LiMn 2 O 4 Compound oxides such as lithium and transition metals. [0003] However, in recent years, as portable electronic equipment and automotive lithium ion secondary batteries, miniaturization and weight reduction are required, and the discharge capacity per unit mass or the characteristic that the discharge capacity does not decrease aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/36H01M4/525
CPCC01G45/1228H01M4/505H01M4/525H01M4/502C01G53/50C01G53/42C01P2006/40C01G53/44C01P2002/52C01G51/50H01M10/052C01G51/42C01G51/44C01D15/02Y02E60/122Y10T29/49115Y02E60/10
Inventor 角崎健太郎曾海生
Owner ASAHI GLASS CO LTD
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