Hollow single-crystalline octahedra of hydrated/dehydrated hydroxyl ferric phosphate and crystal-water-enhanced electrochemical properties of the hydrated sample for reversible lithiation–delithiation

CrystEngComm ◽  
2019 ◽  
Vol 21 (19) ◽  
pp. 3036-3046 ◽  
Author(s):  
Xiaoli Ma ◽  
Hongrui Jiang ◽  
Fanghui Tian ◽  
Yamei Ti ◽  
Miaomiao Zhang ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Lithium Intercalation ◽  
Crystal Water ◽  
Single Crystalline ◽  
Cell Parameters ◽  
Lattice Cell ◽  
Ferric Phosphate ◽  
Hydrated Sample

Crystal water could modify lattice cell parameters and improve the lithium intercalation capability of Fe5(PO4)4(OH)3·2H2O hollow single-crystalline octahedra.

Influence on Electrochemical Properties of Different Types of Manganese Oxides

2021 ◽  
Vol 13 (4) ◽  
pp. 569-573
Author(s):  
Xian-Feng Li ◽  
Gui-Qiang Diao ◽  
Fang Xie ◽  
Wen-Hua Liao ◽  
Luigi Agostini ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Anode Materials ◽  
Manganese Oxides ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Activation Effect ◽  
Cell Parameters ◽  
Crystal System ◽  
Valence States ◽  
High Theoretical Capacity

Manganese oxides have been widely studied as anode materials for lithium-ion batteries because they have many advantages such as high theoretical capacity, abundant resources, low price and low environmental tox-icity. In this paper, various manganese oxide materials, i.e., MnO2, Mn3O4, MnO, (FeO)0.331(MnO)0.669 were prepared by facile methods. The above compounds were then characterized through X-ray diffraction spec-troscopy (XRD). The oxidation states of Mn in these compounds were found to be: +4, +3/+2, +2 and +2 each of them corresponding to a different crystal system, respectively: hexagonal, tetragonal cubic, cubic. The electrochemical properties of these four different manganese oxides, used as anode materials, were investigated to find the possible relationship between their valence states, crystal systems and their electrochemical properties. The results show that their electrochemical properties are influenced by their crystal system and cell parameters, while incorporating FeO into MnO has an activation effect on the reversible lithium ion in the batteries.

Influence of doping on the electrochemical properties of anatase

2002 ◽  
Vol 756 ◽  
Author(s):  
Marina V. Koudriachova ◽  
Simon W. de Leeuw
Keyword(s):  
Phase Separation ◽  
Electrochemical Properties ◽  
Electron Density ◽  
First Principles ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Lithium Intercalation ◽  
First Principles Calculations ◽  
Voltage Profile ◽  
Li Content

The effect of substitution on the intercalation properties of anatase-structured titania has been investigated in first principles calculations. Ti4+-ions were substituted by Zr4+, Al3+ and Sc3+ respectively and O2- -ions by N3-. For each compound the open circuit voltage profile (OCV) was calculated and compared to anatase. Lithium intercalation proceeds as in pure anatase through a phase separation into a Li-rich and a Li-poor phase in all cases examined here. The Li-content of the phases depends on the nature of the dopant and its concentration. Substitution by N3--ions does not lead to lower potentials, whereas doping with trivalent Sc3+- and Al3+- ions decreases the intercalation voltage. Substitution by tetravalent Zr4+-ions within the range of solubility does not significantly affect the OCV of anatase. A correlation is observed between the predicted equilibrium voltage and the participation of the Ti4+-ions in accommodating the donated electron density upon lithiation.

Crystal structure of orthorhombic ferrous nitroprusside: Fe[Fe(CN)5NO].2H2O

2005 ◽  
Vol 20 (1) ◽  
pp. 27-32 ◽  
Author(s):  
J. Rodríguez-Hernández ◽  
E. Reguera ◽  
A. Gómez
Keyword(s):  
Crystal Structure ◽  
Rietveld Method ◽  
Strong Hydrogen Bond ◽  
Hydrogen Bond Interaction ◽  
Crystal Water ◽  
Cell Parameters ◽  
Structural Modifications ◽  
Refinement Process ◽  
Final Agreement ◽  
Coordinated Water

Ferrous nitroprusside can be obtained in three structural modifications: two different unstable phases, monoclinic trihydrate and cubic pentahydrate, and the stable one, an orthorhombic dihydrate. This contribution reports the crystal structure of the last one. Cell parameters are: a=13.9734 (2), b=7.4274 (1), and c=10.4697 (1) Å; with four formula units per cell (Z=4). The crystal structure was refined from the corresponding XRD powder pattern using the Rietveld method. Final agreement factors of the refinement process were Rwp=8.46, Rp=6.54, and S=1.38. The crystal structure is formed by a tridimensional assembling of the [Fe(CN)5NO] molecular block through iron atoms bounded at the N end of the CN ligands. The NO group remains unlinked at its O atom. The octahedral coordination of the assembling metal is completed with a coordinated water molecule which stabilizes a second water through a strong hydrogen bond interaction. The tridimensional structure appears as piled up rippled sheets leading to a system of interconnected small cavities which increase their available volume on the material dehydration. This complex loses its crystal water below 100 °C and then remains stable up to above 160 °C when the decomposition process begins with the loss of the NO ligand.

Mesoporous quasi-single-crystalline NiCo2O4 superlattice nanoribbons with optimizable lithium storage properties

2015 ◽  
Vol 3 (19) ◽  
pp. 10336-10344 ◽  
Author(s):  
Baosong Li ◽  
Jinkui Feng ◽  
Yitai Qian ◽  
Shenglin Xiong
Keyword(s):  
Electrochemical Properties ◽  
Hydrothermal Method ◽  
Lithium Storage ◽  
Single Crystalline ◽  
First Time ◽  
Storage Properties

Mesoporous single-crystalline NiCo2O4 superlattice nanoribbons with excellent electrochemical properties have been prepared via a hexamethylenetetramine (HMT)-assisted hydrothermal method applied to Ni–Co precursor nanobelts, followed by annealing in air for the first time.

Single-Crystalline Mesoporous Molybdenum Nitride Nanowires with Improved Electrochemical Properties

2012 ◽  
Vol 96 (1) ◽  
pp. 37-39 ◽  
Author(s):  
Kyung-Hoon Lee ◽  
Young-Woo Lee ◽  
A-Ra Ko ◽  
Guozhong Cao ◽  
Kyung-Won Park
Keyword(s):  
Electrochemical Properties ◽  
Molybdenum Nitride ◽  
Single Crystalline

Growth and Electrochemical Properties of Single-Crystalline V2O5Nanorod Arrays

2005 ◽  
Vol 44 (1B) ◽  
pp. 662-668 ◽  
Author(s):  
Katsunori Takahashi ◽  
Steven J. Limmer ◽  
Ying Wang ◽  
Guozhong Cao
Keyword(s):  
Electrochemical Properties ◽  
Single Crystalline
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