Melt-Impregnation M-I Method for EMD

An EMD and LiNO, mixture (molar ratio 3 1) is heated at 260 °C (the melting point of LiN03) and then further heated to 350 °C for 5 h. 

A mixture of LiOH and EMD is heated at 420 °C for 2-3 h in order to allow molten LiOH to penetrate into the pores of the EMD. The mixture is then heated from 650 to 800 °C to produce LiMn204. The amount of LiOH and EMD in the mixture must be stoichiometric (LiOH Mn02 = 1 2). The product, LiMn204, is usually tested by cyclic voltammetry (Fig. 22) a good LiMn204does not have peaks at a and b.(peak a (3.3 V) would be due to the oxygen deficiency and peak b (4.5 V) to replacement of the Li ion sites by Mn4+ 

116] A. Kozawa, G. Kana, K. Horiba, Y.Takeuchi, Denki Kagaku 1988, 7, 2. 

117] A. Kozawa, M. Yoshio, H. Noguchi, G. Piao, A.Uchiyama, Prog. Batteries Batt. Mater. 1992, II, 235. 

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