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Electrode and battery

A battery and electrode technology, applied in the field of electrodes of the battery, can solve the problems of reduced other characteristics, inability to form sufficient coatings, and increased manufacturing costs

Inactive Publication Date: 2006-02-22
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when conventional additives are used, a sufficient coating cannot be formed unless a certain amount of additive is added
Therefore, even if the target characteristics can be improved, there are problems such as reduction of other characteristics and increase of manufacturing cost

Method used

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  • Electrode and battery
  • Electrode and battery
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1 to 1-3

[0050] First, 64 parts by mass of lithium cobalt oxide (LiCoO 2 ), 3 parts by mass of graphite as a conductive agent, and 3 parts by mass of polyvinylidene fluoride as a binder were uniformly mixed. After that, N-methylpyrrolidone was added to the mixture to obtain a positive electrode mixture coating liquid. Next, the positive electrode current collector made of aluminum foil with a width of 56 mm, a length of 550 mm, and a thickness of 20 μm is evenly coated with the obtained positive electrode mixture coating liquid, and the coating liquid is dried to form a 70 μm thick layer on both sides of the positive electrode current collector. positive electrode mixture layer. Thus, the positive electrode 21 was manufactured. Subsequently, a cathode lead 25 made of aluminum was attached to one end of the cathode current collector.

[0051] In addition, 94 parts by mass of graphite as a negative electrode active material and 6 parts by mass of polyvinylidene fluoride as a binder we...

Embodiment 2-1 to 2-4

[0060] As Examples 2-1, 2-2, 2-3, and 2-4, secondary batteries were manufactured as in Example 1-2, except that the electrolyte-insoluble and 100 mm 2 Poly(methylhydrogensiloxane), poly(methylphenylsiloxane), poly(hexafluoropropylene oxide), and perfluoropentadecane with a dynamic viscosity of / S and a surface tension of about 20 mN / m Instead of poly(dimethylsiloxane). Like Example 1-2, the secondary batteries of Examples 2-1 to 2-4 were also disassembled and observed. As a result, it was confirmed that poly(methylhydrogensiloxane), poly(methylphenylsiloxane), poly(hexafluoropropylene oxide), or perfluoropentadecane was formed on the surfaces of the positive electrode 21 and the negative electrode 22. coating. In addition, as in Example 1-2, charge and discharge tests were performed to examine cycle characteristics. Its result is shown together with the result of embodiment 1-2 and comparative example 1 in image 3 middle.

[0061] Such as image 3 It was demonstrated th...

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Abstract

An electrode and battery enabling to improve cycle characteristics owing to formation of an effective coating are disclosed. A positive electrode (21) and a negative electrode (22) are wound while having a separator (23) interposed therebetween. The separator (23) is impregnated with an electrolyte. The surface of the positive electrode (21) or the negative electrode (22) is provided with a coating which contains a compound having a surface tension smaller than that of the electrolyte and insoluble to the electrolyte, specifically a siloxane such as poly(dimethylsiloxane), poly(methylhydrosiloxane) or poly(methylphenylsiloxane), a perfluoropolyether such as poly(hexafluoropropylene oxide), or a perfluoroalkane such as perfluoropentadecane. Consequently, a coating effective for suppressing decomposition reaction of the electrolyte can be formed without using a large amount of the compound which forms the coating.

Description

technical field [0001] The present invention relates to a battery comprising a positive electrode, a negative electrode, and an electrolytic solution, particularly using lithium (Li) or the like as an electrode reaction substance, and to an electrode used for the battery. Background technique [0002] In recent years, many portable electronic devices such as combination cameras (video tape recorders), digital still cameras, mobile phones, personal digital assistants, and laptop computers have been introduced, and size reduction and weight reduction of these portable electronic devices have been carried out. Along with these circumstances, research and development to improve the energy density of batteries, particularly secondary batteries as portable power sources for these electronic devices, has been actively promoted. In particular, since such lithium ion secondary batteries can provide greater energy density compared with lead storage batteries, nickel-cadmium batteries,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M10/40H01M4/06H01M6/16H01M6/18H01G9/00H01M4/13H01M4/62H01M10/05H01M10/052H01M10/0564H01M10/0567H01M10/0569H01M10/0587
CPCH01M10/052H01M4/13H01M4/62Y02E60/122Y02E60/10Y02P70/50H01M10/05
Inventor 川岛敦道远藤琢哉
Owner SONY CORP
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