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Dissolution of Mn into an electrolyte from LiMn2O4 in Li ion cell is researched recently. To study an influence of the dissolved manganese species on performance of negative electrode, electrochemical behavior of graphite was investigated in LiClO4 solution containing Mn2+ by dissolving Mn(ClO4)2. During charging, manganese ions were firstly electroreduced on the electrode, followed by Li intercalation into graphite. Mn deposition was confirmed after charge-discharge test, furthermore, the reversible capacity of lithium intercalation was decreased. The results were compared to those in a cobalt additive electrolyte.

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lntroduclion Magnetic wood, which was first introduced and developed by the Oka group in 1991, achieves both woody and magnetic functions by actively adding magnetic characteristics to the wood itself[l] [2]. In addition to showing magnetic characteristics, this magnetic wood also offers a wood texture, low specific gravity and is very easy to process. This study proposes a grooving process for the coating-type magnetic wood in order to take advantage of the easy processing offered by this method. The experimental results show that by changing the shape and size of the surface, the electromagnetic wave absorption characteristics can be controlled . Figures I(a),(b) and (c) show fiber wood boards that have undergone a grooving process on their respective surfaces. The patterns embedded into the surfaces by the grooving process are parallel lines, column shapes and grid lines, respectively. W ' 1 00 w (b) column shapes (c) gridlines Fig I Coating-type magnetic wood with patterns embedded by grooving process Exuerimental ResultsFig2 shows the measured results of the electromagnetic wave absorption characteristics of coating-type magnetic wood with grid lines embedded by the grooving process. We used a Free-space technique for the measurement. Table 1 shows a comparison of the electromagnetic wave absorption characteristics of three types of processed magnetic wood boards and a non-processed magnetic wood board.