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Non-aqueous electrolyte secondary battery

一种非水电解质、二次电池的技术，应用在非水电解质蓄电池、二次电池、锂蓄电池等方向，能够解决循环特性变差、放电容量降低、加速正极侧电解质氧化分解等问题，达到循环特性和充电保存性能优良、初期容量大的效果

Active Publication Date: 2009-06-10
PANASONIC ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when charging at a high voltage, undesired reactions such as oxidative decomposition of the electrolyte on the positive electrode side are accelerated, resulting in poor cycle characteristics.
In addition, when a battery in a charged state is stored under high temperature conditions, the discharge capacity will decrease after storage, or the battery thickness will increase due to the gas generated by the reaction between the positive electrode and the electrolyte.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100]

[0101] Lithium-cobalt composite oxide (active material A), which is one of positive electrode active materials, was produced as follows.

[0102] Zirconium (Zr) which is 0.15 mol% relative to cobalt (Co) and magnesium (Mg) which is 0.5 mol% relative to cobalt are co-precipitated as hydroxides, and thermal decomposition reactions occur, thereby obtaining a product containing zirconium and magnesium. tricobalt tetroxide (Co 3 o 4 ).

[0103] This tricobalt tetroxide was mixed with lithium carbonate, and fired at 850° C. for 24 hours in an air atmosphere. This was pulverized in a mortar to an average particle diameter of 14 μm to obtain a lithium-cobalt composite oxide (active material A) containing zirconium and magnesium.

[0104] In addition, another component in the positive electrode active material: lithium manganese nickel composite oxide (active material B) was produced as follows.

[0105] Lithium carbonate (Li 2 CO 3 ) and Ni 0.33 mn 0.33 co 0.34 (OH...

Embodiment 2

[0115] A nonaqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that the amount of pentafluorophenyl methanesulfonate added was 2.0% by mass relative to the total mass of the nonaqueous electrolyte.

Embodiment 3

[0117] A nonaqueous electrolyte secondary battery was manufactured in the same manner as in Example 1 except that the amount of pentafluorophenyl methanesulfonate added was 3.0% by mass relative to the total mass of the nonaqueous electrolyte.

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Abstract

A non-aqueous electrolyte secondary battery has a high initial capacity and excels in cycle characteristics and storage characteristics even when charged until the potential of the positive electrode active material exceeds as high as 4.3V versus lithium. The non-aqueous electrolyte of the secondary battery contains both 1,3-dioxane and a sulfonic acid ester compound.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery, and more particularly, the present invention relates to a nonaqueous electrolyte secondary battery having improved cycle characteristics and charge storage characteristics. Background technique [0002] Nowadays, mobile information terminals such as mobile phones and notebook computers are rapidly developing in terms of high performance, small size and light weight. As mobile power sources for these terminals, nonaqueous electrolyte secondary batteries represented by lithium ion secondary batteries having high energy density and high capacity have been widely used. [0003] In recent years, in response to the demand for higher performance of these devices, further higher capacity of batteries has been demanded. [0004] As a means for increasing the battery capacity, it is known to increase the utilization efficiency of the positive electrode active material by charging the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/052H01M10/0567H01M10/36
CPCY02E60/122H01M10/052H01M10/0567Y02E60/10
Inventor 岩永征人山下纪子安部浩司三好和弘
Owner PANASONIC ENERGY CO LTD
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