Electrode and battery

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,...

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