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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, electrolytes, etc., can solve the problems of the deterioration of the crystal structure of the positive electrode active material, the reaction between the positive electrode active material and the non-aqueous electrolyte, etc. The effect of structural changes

Inactive Publication Date: 2016-09-28
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the charging voltage of the battery is increased, deterioration of the crystal structure of the positive electrode active material and reaction between the positive electrode active material and the non-aqueous electrolyte are likely to occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] [making of positive electrode]

[0038] The positive electrode active material was produced as follows. Lithium carbonate was used as a lithium source, cobalt tetroxide was used as a cobalt source, and nickel hydroxide, manganese dioxide, and aluminum hydroxide were used as nickel, manganese, and aluminum sources serving as cobalt replacement element sources. After dry mixing cobalt, nickel, manganese and aluminum at a molar ratio of 84:10:5:1, it is mixed with lithium carbonate at a molar ratio of lithium and transition metals of 1:1, and the powder is formed into granules , in an air atmosphere, calcined at 900° C. for 24 hours to prepare a positive electrode active material.

[0039] Next, a rare earth compound is attached to the surface by a wet method as described below. 1000 g of the positive electrode active material and 3 liters of pure water were mixed and stirred to prepare a suspension in which the positive electrode active material was dispersed. While ad...

Embodiment 2

[0055] Battery A2 was fabricated in the same manner as in Example 1 except that the molar ratio of cobalt, nickel, manganese, and aluminum was 79:15:5:1 to prepare the positive electrode active material.

Embodiment 3

[0057] Battery A3 was fabricated in the same manner as in Example 1 except that the molar ratio of cobalt, nickel, manganese, and aluminum was 68:25:5:2 to prepare the positive electrode active material.

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Abstract

Provided is a nonaqueous electrolyte secondary battery which achieves a high capacity and a long service life by being suppressed in structural change of a positive electrode active material at high voltage. A nonaqueous electrolyte secondary battery which is provided with: a positive electrode that comprises a positive electrode active material which absorbs and desorbs lithium ions; a negative electrode that comprises a negative electrode active material which absorbs and desorbs lithium ions; and a nonaqueous electrolyte. This nonaqueous electrolyte secondary battery is characterized in that: the positive electrode active material is a lithium-cobalt composite oxide that contains nickel, manganese and aluminum; and a rare earth compound or oxide adheres to a part of the surface of the positive electrode active material.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery. Background technique [0002] Non-aqueous electrolyte secondary batteries represented by lithium-ion batteries are often used as drive power sources for portable electronic devices such as mobile phones, portable computers, PDAs, and portable music players including smartphones. Furthermore, it is used to suppress fluctuations in output power of electric vehicles, hybrid electric vehicle drive power supplies, solar power generation, wind power generation, etc., and is used for peak shifting of system power that stores power at night and utilizes it during the day, etc. Most of the stationary storage battery systems use non-aqueous electrolyte secondary batteries. [0003] However, there is a tendency for the power consumption to increase further with the improvement of the applied equipment, and further increase in capacity is strongly desired. Measures for increasing the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/36H01M4/505H01M10/052H01M10/0569
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M10/052H01M10/0569H01M2300/0034Y02E60/10Y02P70/50H01M4/131H01M4/623H01M4/625H01M4/661H01M10/0525H01M10/0568H01M10/0587H01M2300/0037Y02T10/70
Inventor 高梨优长谷川和弘鹤田翔福井厚史
Owner SANYO ELECTRIC CO LTD
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