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Nonaqueous electrolyte secondary battery and method for manufacturing nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, non-aqueous electrolytes, etc., can solve problems such as DC resistance rise

Inactive Publication Date: 2015-06-17
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with regard to the nonaqueous electrolyte secondary battery described in the examples of Patent Document 1, if it is placed in a high temperature environment such as 60° C. when the battery is used with a low state of charge, there is a direct current at low temperatures such as below freezing point. The problem that the resistance has increased significantly compared to before placement

Method used

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  • Nonaqueous electrolyte secondary battery and method for manufacturing nonaqueous electrolyte secondary battery

Examples

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Effect test

Embodiment 1

[0051] A lithium ion secondary battery as a nonaqueous electrolyte secondary battery was produced by the methods (1) to (4) shown below.

[0052] (1) Production of positive electrode

[0053] Manganese sulfate hydrate, nickel sulfate hydrate, and cobalt sulfate hydrate were dissolved in ion-exchanged water so that the respective elements of manganese, nickel, and cobalt became 1:1:1, to prepare a mixed solution. At this time, the concentration of the mixed solution was 0.667 M and the volume was 180 ml. Next, 600 ml of ion-exchanged water was prepared in a 1-liter beaker, and 8N NaOH was added dropwise to prepare a lye solution adjusted to pH 11.5. In addition, the temperature of the beaker was adjusted to 50° C., and Ar gas was bubbled in the lye. Thereafter, the above-mentioned mixed solution was added dropwise to the alkali solution at 3 ml / min while maintaining the temperature and pH of the alkali solution. At the same time, 50 ml of 2.0 M hydrazine aqueous solution was...

Embodiment 2～16 and comparative example 1～10

[0061] As shown in Table 1, except for changing the type of the positive electrode active material, the average particle diameter of the positive electrode active material, the type of the cyclic sulfate ester compound, or the concentration of the cyclic sulfate ester compound in the electrolyte, it is the same as in Example 1. to manufacture lithium-ion secondary batteries. In addition, in Comparative Examples 1 to 4, instead of the lithium nickel-cobalt-manganese composite oxide used as the positive electrode active material, Li1.1 mn 1.8 al 0.1 o 4 It is produced by the following general synthesis method. That is, by mixing lithium hydroxide, aluminum hydroxide and MnO in a specified molar ratio 2 The obtained solution was dried by a spray drying method to obtain a precursor containing Li and Mn. The precursor was pre-calcined in air at 500°C for 12 hours, followed by calcination at 750°C for 12 hours, and further crushed and classified to obtain Li with an average part...

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Abstract

The present invention addresses the problem of providing a nonaqueous electrolyte secondary battery which is suppressed in increase in the direct-current resistance after being left at relatively high temperatures with low remaining battery power. The present invention provides, as a means for solving this problem, a nonaqueous electrolyte secondary battery which is provided with an electrolyte and a positive electrode that has a particulate positive electrode active material. The positive electrode active material contains a nickel-containing lithium transition metal oxide, and has an average particle diameter of 3-15 μm. The electrolyte contains a cyclic sulfuric acid ester compound that has a specific structure.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery and a method for manufacturing the nonaqueous electrolyte secondary battery. Background technique [0002] Conventionally, as a nonaqueous electrolyte secondary battery, a lithium ion secondary battery provided with an electrolyte containing a lithium salt, etc. are known. Specifically, it is known that the positive electrode active material contains LiCoO 2 or LiMnO 2 Lithium-containing transition metal oxides, and the electrolyte contains 4,4’-bis-1,3,2-bis A non-aqueous electrolyte secondary battery of cyclic sulfate ester compounds such as oxathiophene 2,2,2',2'-tetroxide (Patent Document 1). [0003] Examples of Patent Document 1 describe a non-aqueous electrolyte secondary battery in which the positive electrode active material contains the above-mentioned lithium-containing transition metal oxide and the electrolyte contains the above-mentioned cyclic sulfate compoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/58H01M4/587H01M10/052
CPCH01M4/505H01M4/525H01M10/052H01M10/0567H01M2004/021H01M4/587Y10T29/49108Y02E60/10Y02P70/50H01M10/0525H01M10/058H01M2004/028H01M2300/0025
Inventor 西江胜志川副雄大八田刚志
Owner GS YUASA INT LTD
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