Secondary zinc-manganese dioxide batteries for high power applications
A battery and flow battery technology, applied in secondary batteries, battery electrodes, alkaline batteries, etc., can solve problems such as reducing battery cycle life
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example 1
[0151] For a non-flowing secondary Zn-MnO 2 The characteristics of the battery and / or its components are studied. More precisely, for a MnO 2 Viscosity properties of the cathode mixture; MnO 2 The effect of the thickness of the cathode on the discharge capacity was studied.
[0152] A MnO was prepared by blending the following for 2 min 2 Cathode mix: 65wt.% MnO 2 , 35wt.% graphite and 5wt.% TEFLON emulsion, wherein the TEFLON emulsion contains 60wt.% TEFLON; then filter the MnO 2 Cathode mix. The MnO was tested by an ARES controlled strain rheometer 2 The viscosity properties of the cathode mixture were analyzed, and the data are presented in Figure 4A in the graph of . The MnO 2 The cathode mixture clearly exhibits a strong shear thinning property. For stresses below about 50 Pa, elastic properties dominate over viscous properties. For stresses above about 50Pa, the dominant term is inverted, as Figure 4B shown in .
example 2
[0154] MnO described in Example 1 2 The cathode mix was used to prepare three different thicknesses of MnO 2 Cathode: 1mm (0.039 inches), 0.6mm (0.024 inches), 0.4mm (0.016 inches). The anode used in all cases was a 0.4 mm (0.016 inch) thick non-flowing battery Zn anode comprising 85 wt.% Zn, 10 wt.% ZnO and 5 wt.% TEFLON emulsion containing 60 wt.% TEFLON. The non-flow battery electrolyte solution was a 30 wt. % potassium hydroxide aqueous solution.
[0155] Non-flowing secondary Zn-MnO 2 The battery was prepared by heat-sealing the non-flow battery Zn anode in a layer of FS 2192 SG film as the electrode separator of the anode; 2 The cathode was wrapped in 3 layers of battery-grade cellophane as the electrode separator for the cathode; two MnO 2 The cathodes were alternately sandwiched with three no-flow cell Zn anodes, which were then held under compression in a polysulfone molded box. A 30 wt.% potassium hydroxide (KOH) solution was used as the non-flow battery electr...
example 3
[0158] For a non-flowing secondary Zn-MnO 2 The characteristics of the battery and / or its components are studied. More precisely, for MnO 2The thickness of the cathode electrode separator on the non-flowing secondary Zn-MnO 2 The effect on the performance of the battery was studied.
[0159] Non-flowing secondary Zn-MnO 2 Cells were prepared as described in Example 2, except that the MnO 2 The number of layers of electrode separator (eg, battery grade cellophane) of the cathode was varied in order to obtain the desired electrode separator thickness. used to measure the non-flowing secondary Zn-MnO 2 A measure of battery performance is the product of the applied current at a given voltage and the thickness of the electrode separator, which represents an indirect measure of resistance across the electrode separator, and the results are shown in Figure 6 middle. as from Figure 6 It can be seen from the graph that, with the MnO 2 The thickness of the cathode electrode s...
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