【摘 要】
：
LiMn2O4-xFx prepared by the sol-gel method has a perfect crystal formation .The crystal particle size of the material was medium and distributed uniformly. The
论文部分内容阅读
LiMn2O4-xFx prepared by the sol-gel method has a perfect crystal formation .The crystal particle size of the material was medium and distributed uniformly. The substitution of F for O increased the specific capacity of the material at the cost of the cycleability .The explanation of this results is that the F decreases the valence of Mn,that is,more Mn3+ and less Mn4+ exist in the material.The increase of Mn3+ will improve the initial specific capacity and Mn3+ is the original reason for Jahn-Teller effect that caused the poor cycleability of the cathode material by the micro-distortion of the crystal structure. In addition, the expanded measurement of the crystal lattice is also the reason for the poor cycleability.Therefore,the results of F-substitution and cation-substitution are opposite.If the two methods are combined,they can compensate the inability each other and the satisfactory results may be obtained.
其他文献
Glutathione is an important antioxidant and has many important functions in plant development,growth and defense.Glutathione synthesis and degradation is highly
Background A new technique developed in 2002, real time endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA), has been one of the most i
Potassium ferrate impregnated on montmorillonite is a mild,cheap,and non-toxic reagent for the iodination of phenols, including naphthol,aromatic amines,and het
Two new sapogenins, named (205, 24R)-3β,20,21β,25-tetrahydroxy-21,24-cyclodammarane (1) and 3β-hydroxyetio-17β-dammaranic acid (2), were isolated from the a
Background Blood culture contamination is a significant adverse event.The aim of this project was to evaluate the efficacy of a strict blood collection procedur
Ti-15-3 alloy is a new metastableβ-type titanium. The influence of hot deformation parameters on the microstructureof Ti-15-3 alloy after solution treatment ha
Sulfamic acid was proved to be a cost-effective and recyclable catalyst for Friedel-Crafts type reaction of indole with α,β-unsaturated carbonyl compound and
Phase behavior of binary system of bromobenzene-chlorobenzene (C6H5Br-C6H5Cl) confined in SBA-15 and MCM-41 (pore diameter 8 nm, 3.8 nm, respectively) has been
Background Metformin has become a cornerstone in the treatment of patients with type-2 diabetes. Accumulated evidence suggests that metformin supports direct ca