Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as curing, and achieve the effect of improving quality and productivity

Active Publication Date: 2008-09-24
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the material mixture slurry contains an alkali metal salt, there is a problem of solidifying the material mixture layer along with the coagulation of the slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] (i) Production of positive electrodes

[0069] Solid solution nickel hydroxide containing a certain amount of cobalt and aluminum is used as a raw material of the positive electrode active material. More specifically, solid solution nickel hydroxide (nickel hydroxide A) and lithium hydroxide having an average particle diameter of 7 µm were mixed, followed by firing at 950°C. The resulting product was cooled slowly to 100°C for 12 hours. Thereby obtaining secondary particles of lithium-nickel composite oxide (composition: LiNi 0.8 co 0.15 Al 0.05 o 2 ), called particulate matter A. Meanwhile, granular substance B was prepared in the same manner as in the production of granular substance A except that solid solution nickel hydroxide (nickel hydroxide B) having an average particle diameter of 0.3 μm was used.

[0070] The weight ratio of the particulate matter A and B is A:B=70:30. Particulate matter A has an average particle size of 20 microns. The average particl...

Embodiment 2 to 4

[0083] Except by changing the average particle diameter of solid solution nickel hydroxide B to 1 micron, 1.5 micron and 3 microns respectively, so that the average particle diameter of particulate matter B is changed to 3 microns, 5 microns and 10 microns respectively, according to the embodiment Batteries of Examples 2, 3 and 4 were produced in the same manner as in 1.

Embodiment 5 to 7

[0085] Except that by changing the average particle size of solid solution nickel hydroxide A to 3 microns, the average particle size of particulate matter A changes by 10 microns, and by changing the average particle size of solid solution nickel hydroxide B to 1 micron and 1.5 microns and 2.5 microns, so that the average particle size of the particulate matter B was changed to 3 microns, 5 microns and 8 microns, respectively, and the batteries of Examples 5, 6 and 7 were produced in the same manner as in Example 1.

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Abstract

Disclosed is a non-aqueous electrolyte secondary battery having an electrode group in which a positive electrode and a negative electrode are spirally wound with a separator interposed therebetween. The positive electrode contains a positive electrode active material and a binder. The positive electrode active material contains a mixture of two different particulate substances having different average particle sizes. The two different particulate substances are lithium composite metal oxides containing nickel as an essential element. The binder includes fluorocarbon resin and rubber particles. The fluorocarbon resin contains at least a vinylidene fluoride unit. The amount of the rubber particles per 100 parts by weight of the fluorocarbon resin is 1 to 25 parts by weight.

Description

technical field [0001] The present invention relates to a high-capacity non-aqueous electrolyte secondary battery, in particular to the improvement of the flexibility of the positive electrode. Background technique [0002] In recent years, with the spread of smaller and lighter-weight electronic devices, such as cellular phones and notebook computers, the demand for higher-capacity secondary batteries as their power sources is increasing. So far, there have been developed materials containing lithium cobalt oxides (such as LiCoO 2 ) as a positive electrode of a positive electrode active material, and a nonaqueous electrolyte secondary battery including a negative electrode of a carbon material, and is now widely used. [0003] However, because of the Co content, LiCoO 2 it's very expensive. To this end, various metal oxides have been proposed as LiCoO 2 alternatives and has been studied intensively. Examples of these metal oxides include lithium composite metal oxides ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M10/40H01M4/131H01M4/525H01M4/62
CPCY02E60/122Y02E60/10
Inventor 谷口明宏铃木刚平堤修司武野光弘渡边耕三竹内崇斋藤贵也
Owner PANASONIC CORP
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