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Preparation Of Composite MnO/C Nanofibers By Electrospinning And Their Lithium Storage Properties

Posted on:2015-08-18Degree:MasterType:Thesis
Country:ChinaCandidate:B LiuFull Text:PDF
GTID:2271330452955227Subject:Materials science
Abstract/Summary:PDF Full Text Request
In recent years, global energy problem is emerging seriously. Renewable energyconversion and storage systems in instant need are becoming more and more obvious.Electrode materials with high efficiency and environmental benign is dominate in theapplication research. However, traditional electrode materials that have been widely usedcannot gain the futher application for LIBs with more outstanding performance, Such asgraphite, which only has a theoretical capacity of372mAh g. Considering the increasingdemands for large energy and power density currently, people invested a lot of energy toexplore the more suitable anode materials with excellent lithium storage properties. Recently,the TMOs as promising anode materials perform excellent lithium storage properties. But thephenomenon is still not solved volume expansion, structure failure, capacity fading rapidlyand their applications restricts. The valid approaches by refining grain, increasing specificsurface area and coating carbon have significantly improved the lithium-storage performanceof LIBs. Electrospinning has provided versatile and controllable method to produce electrodematerials which possess high specific surface area and excellent electrical conductivity andconstruct uniform one-dimensional (1D) carbon-coated composite fibers at amicro/nano-scale.Finally, substantial TMOs nannofibers have been electrospun combining with solvothermalmethod and then further investigated the lithium-storage properties. Among TMOs, MnO hasaroused much attention for high-performance LIBs, since it possesses high theoreticalcapacity (755mAh g), low voltage hysteresis comparatively (<0.8V). The carbon-coatedMnO nanofibers (MnO/CNFs) were prepared successfully, which include MnO nanocrystalsof~15nm and nanoporous that are encapsulated within porous1D carbon nanofibers. TheMnO/CNFs with novel structure by the self-assembly method is prepared controlled,exhibiting excellent electrochemical results...
Keywords/Search Tags:Lithium-ion batteries, Anode materials, Electrospinning, MnO, Porous, Lithiumstorage properties
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