Copper Foil Smooth on Both Sides for Lithium-Ion Battery
An electrodeposited copper foil has been used in many areas of printed-wiring boards, such asrigid printed-wiring boards and flexible printed-wiring boards, as shown in Fig. 10.1 . Even now, it is estimated that more than 90 % of all the electrodeposited
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Copper Foil Smooth on Both Sides for Lithium-Ion Battery Akitoshi Suzuki and Jun Shinozaki
10.1 Introduction An electrodeposited copper foil has been used in many areas of printed-wiring boards, such as rigid printed-wiring boards and flexible printed-wiring boards, as shown in Fig. 10.1. Even now, it is estimated that more than 90 % of all the electrodeposited copper foil production is being used for printed-wiring boards. On the other hand, the use of electrodeposited copper foil as the negative electrode collector of lithium-ion batteries has recently been attracting attention. The time when the electrodeposited copper foil came into use in this field was comparatively recent, i.e., in the latter half of the 1990s. Many lithium-ion batteries are being used for mobile phones, smart phones, notebook personal computers, etc. In addition, major automakers around the world are currently studying its use in EV, HEV, PHEV, etc. A ‘‘copper foil smooth on both sides,’’ which is an electrodeposited copper foil for lithium-ion batteries, has been developed during the optimization process because a decrease in the capacity retention rate occurred during repeated charge and discharge of the battery when the electrodeposited copper foil for a printedwiring board was used as the lithium-ion battery negative electrode collector. Around 1991 lithium-ion batteries began to be industrially mass-produced. At that time, a rolled copper foil was used as the negative electrode collector. In the mid-1990s, an attempt to use an electrodeposited copper foil as the negative
A. Suzuki (&) Development Dept. Copper Foil Division, Furukawa Electric Co., Ltd. Metal Research Center, 601-2, Otorozawa, Nikko-City, Tochgi 321-2336, Japan e-mail: [email protected] J. Shinozaki Furukawa Electric Co., Ltd. Metal Research Center, Nikko-City, Japan e-mail: [email protected]
K. Kondo et al. (eds.), Copper Electrodeposition for Nanofabrication of Electronics Devices, Nanostructure Science and Technology 171, DOI: 10.1007/978-1-4614-9176-7_10, Springer Science+Business Media New York 2014
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A. Suzuki and J. Shinozaki
Fig. 10.1 Uses of electrodeposited foil
electrode collector instead of the rolled copper foil was performed in order to reduce costs. Because only the electrodeposited copper foil for printed-wiring boards existed as an electrodeposited copper foil at that time, the electrodeposited copper foil for printed-wiring boards was used as the negative electrode collector in manufactured batteries for charge–discharge tests. The electrodeposited copper foil for printed-wiring boards has (a) a ‘‘matte side’’ with pyramidal convexities and the opposite side and (b) a ‘‘shiny side’’ with a smooth face as shown in Fig. 10.2. Though the battery capacity retention rate of lithium-ion batteries gradually decreases with repeated charge and discharge, the capacity retention rate of the battery using the electrodeposited copper foil for printed-wiring boards as the negative electrode collector decreased at a rate faster than
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