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Preparation And Electrochemial Performance Research Of Li[Ni1/3Co1/3Mn1/3]O2 And Olivine LiFePO4

Posted on:2009-08-31Degree:MasterType:Thesis
Country:ChinaCandidate:Y XuFull Text:PDF
GTID:2132360245954040Subject:Physical chemistry
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Recently, Li[Ni1/3Co1/3Mn1/3]O2 has been reported to be one of attractive cathode materials in safety and cost. Investigating a simple, environmental new preparation method, and further improving its properties are very necessary for commercialization of the material. Have been large-scale industrialization of the lithium-ion batteries also are not many. Including LiCoO2, Li2MnO4, LiNiO2, LiFePO4. The existence of which LiCoO2 Co resources expensive and toxic and other issues, and the presence of LiNiO2 major difficulties, can not be measured by the ratio of the problem, the researchers have struggled to find new alternative materials to replace the variety of portable devices used in the lithium-ion Battery. This paper examine in detail the battery cathode materials on the basis of progress has selected a layered structure of Li [Ni1/3Co1/3Mn1/3] O2 materials for the research priorities, a key step in its synthesis that is the precursor to the preparation of In-depth and meticulous study and examine the conditions of the Li [Ni1/3Co1/3Mn1/3] O2 electrochemical properties of discussed the temperature and lithium properties of the material.In this paper on the first synthesis of precipitation and reagent selection, precursor processing, heat treatment and preparation of lithium in terms of the ratio of layered Li[Ni1/3Co1/3Mn1/3]O2 material surface, lattice constant, particle size distribution and electrochemical properties of. A method of cathode material - hydroxide total precipitation for its synthetic route: Use of NaOH + NH4OH as precipitation reagent preparation [Ni1/3Co1/3Mn1/3] (OH)2 precipitation precursor, and then mixed with Li2CO3 full uniform, lithium ratio of 1.10, a sintering in subparagraph 450℃under sintering 6 h, To smash the 900℃under calcining 16 h. Through hydroxide precipitation precursor analysis, combined with X-ray diffraction (XRD) analysis, the precursor of the pre-temperature should be 450℃.Calcined inspected the different temperature (800℃,900℃) of Li[Ni1/3Co1/3Mn1/3]O2 the structure and electrochemical properties of light scanning electron microscopy (SEM) Analysis, found that in 900℃under a system of Li[Ni1/3Co1/3Mn1/3]O2 were spherical, uniform size, structure with a-NaFeO2, At different temperatures of the Li[Ni1/3Co1/3Mn1/3]O2, its discharge capacity of the highest recycling rate performance and best performance. In the 2.5-4.6 V, 0.1C under the first discharge capacity of 170.29 mAh / g (to Li for the negative electrode) is a great development prospects of lithium-ion battery cathode materials. In addition, the use of self-made ball Fe2O3 source for iron, LiH2PO4 as a source of lithium, food starch as a carbon source, a synthesis of olivine LiFePO4 its outlook for the transmission electron microscope revealed that type of spherical shape.
Keywords/Search Tags:Lithium-ion batteries, cathode materials, Li[Ni1/3Co1/3Mn1/3]O2, LiFePO4, hydroxides total precipitation
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