Structural Characterization of Heat‐treated Electrolytic Manganese Dioxide and Topotactic Transformation of Discharge Products in the Li ‐ MnO2 Cells

1997 ◽  
Vol 144 (9) ◽  
pp. 3147-3153 ◽  
Author(s):  
Y. Shao‐Horn ◽  
S. A. Hackney ◽  
B. C. Cornilsen
Keyword(s):  
Manganese Dioxide ◽  
Structural Characterization ◽  
Electrolytic Manganese Dioxide ◽  
Heat Treated ◽  
Electrolytic Manganese ◽  
Topotactic Transformation

XRD and Tem Characterization of Cathodic MnO2 and Discharge Products in the Li-MnO2 Cell

1995 ◽  
Vol 393 ◽  
Author(s):  
Y. Shao ◽  
S.A. Hackney ◽  
B.C. Cornilsen
Keyword(s):  
Lattice Parameter ◽  
X Ray Diffraction ◽  
Electrolytic Manganese Dioxide ◽  
Cathodic Material ◽  
X Ray ◽  
Heat Treated ◽  
Electrolytic Manganese ◽  
Xrd Patterns ◽  
Convergent Beam

ABSTRACTThe crystal structures of the undischarged, heat-treated electrolytic manganese dioxide (HEMD) and discharge products are characterized by high spatial resolution convergent beam electron diffraction (CBED). The results are compared with the x-ray diffraction (XRD) patterns characterized by broad, diffuse peaks. The CBED results for HEMD show that the starting cathodic material has the pyrolusite space group, but with a range of c/a ratios. The variability of the lattice parameter from grain to grain is found to coincide with the broadening on the low angle side of the XRD peaks. The CBED patterns of discharge products suggest a reduction range in c/a ratios and the formation of another phase.

Thermal expansion of manganese dioxide using high-temperaturein situX-ray diffraction

2013 ◽  
Vol 46 (5) ◽  
pp. 1283-1288 ◽  
Author(s):  
Wesley M. Dose ◽  
Scott W. Donne
Keyword(s):  
Thermal Expansion ◽  
Manganese Dioxide ◽  
Thermal Response ◽  
X Ray Diffraction ◽  
Electrolytic Manganese Dioxide ◽  
Synthesis Conditions ◽  
Thermal Expansion Coefficients ◽  
Heat Treated ◽  
Electrolytic Manganese ◽  
Different Origins

High-temperaturein situX-ray diffraction is used to determine the thermal expansion behaviour of manganese dioxide in air at temperatures between 298 and 673 K, the range accessible prior to material decomposition. Two manganese dioxide samples of different origins are investigated to observe the effect of synthesis conditions and resultant material properties on the thermal response. β-MnO2prepared by a chemical pathway is found to expand linearly over the temperature window with thermal expansion coefficients (in units of K−1) of αa= 9.3 (4) × 10−6, αc= 7.0 (2) × 10−6and β = 25.6 (8) × 10−6. Conversely, the thermal expansion of heat-treated electrolytic manganese dioxide is disjointed about 473 K in theadirection and for the overall unit-cell volume, and about 523 K in thecdirection. Coefficients are therefore given (in units of K−1) as αa= 23 (4) × 10−6(298–473 K), 10 (3) × 10−6(473–673 K); αc= 0.2 (9) × 10−6(298–523 K), 10 (1) × 10−6(523–673 K); and β = 49 (9) × 10−6(298–473 K), 26 (5) × 10−6(473–673 K).

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