Lithium ion cell of portable electronic equipment

Abstract

A lithium cell of portable electronic apparatus, includes shell, positive active material in the shell, negative active material and electrodes formed by the material, membrane and electrolyte between electrode, whose characteristic is that the positive active material is compound material mixed by lithium-cobalt oxide (LiCoO2) and lithium-manganese oxide (LiMnO4).It can be used as electric powder source in mobile phone, digital photographer digital camera MP3 and another portable electronic apparatus, has low cost and excellent property, solves the problem that lithium cell is prone to expand and increases overcharge property of battery.

Description

technical field [0001] The invention relates to the technical field of methods and devices for directly converting chemical energy into electric energy, and in particular to the technical field of electrodes composed of inorganic oxides as active materials. Background of the invention [0002] In recent years, in order to meet the needs of the development of electronic equipment, especially mobile phones, digital cameras, MP3 and other communication equipment and portable electronic equipment, the requirements for batteries as a necessary component are also getting higher and higher, including low prices, superior Performance, small volume, etc.; but ordinary lithium cobalt oxide (LiCoO 2 ) materials due to the high price of rare metal cobalt, resulting in high battery costs; while lithium cobalt oxide (LiCoO 2 ) The expansion performance of the material during charging makes it difficult to control the thickness of the battery, because the internal expansion of the battery...

AI Technical Summary

Problems solved by technology

[0002] In recent years, in order to meet the needs of the development of electronic equipment, especially mobile phones, digital cameras, MP3 and other communication equipment and portable electronic equipment, the requirements for batteries as a necessary component are also getting higher and higher, including low prices, superior Performance, small volume, etc.; but ordinary lithium cobalt oxide (LiCoO 2 ) materials due to the high price of rare metal cobalt, resulting in high battery costs; while lithium cobalt oxide (LiCoO 2 ) The expansion performance of the material during charging makes it difficult to control the thickness of the battery, because the internal expansion of the battery during charging causes the battery thickness to exceed the standard; again lithium cobalt oxide (LiCoO 2 ) The anti-overcharge performance of the material is low, and the overcharge voltage of the battery is low; the use of cheap lithium manganese oxide (LiMn 2 o 4 ) material to replace the expensive lithium cobalt oxide (LiCoO 2 ) materials have been proposed by many people, but lithium manganese oxide (LiMn 2 o 4 ) The gram specific capacity of the material is low, only 100mAh / g, only lithium cobalt oxide (LiCoO 2 ) 2 / 3 of the material, to achieve the same as lithium cobalt oxide (LiCoO 2 ) The same capacity battery made of materials will inevitably increase the volume, which is not suitable for portable electronic devices; in order to reduce costs, have high repeat stability and good environmental compatibility, someone proposes a lithium-manganese, Nickel oxide Li(Mn x Ni 1-x )O 2 As an electrode material, see the publication specification of my country's invention patent application, publication number: CN1402889A; but making this compound is more complicated and difficult to implement