Predicted Discharge Rate for gamma/beta-MnO2 versus lambda-MnO2
Interim rept. 1-21 Jan 2000
ARMY RESEARCH LAB ADELPHI MD
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Recently, lambda-MnO2 has been proposed as an alternative cathode to gammabeta-MnO2 in LiMnO2 primary batteries because of its potential faster discharge rate. The results presented here suggest that 1 switching from gammabeta-MnO2 to lambda-MnO2 of equal particle size will lead to a maximum increase in the discharge rate at room temperature of about an order of magnitude and 2 when formed by acid digestion, gamma-MnO2 and beta-MnO2 have a higher lithium diffusivity and hence a faster discharge rate than when they are produced by the usual commercial means, a difference that may result from the lower structural water content in the materials produced by acid digestion.
- Physical Chemistry
- Electrochemical Energy Storage