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Carbon-coated LiMnBO3/C is synthesized by a sol-gel method using polyethylene glycol 6000 (PEG-6000) as carbon source. The influences of different sintering temperatures on the crystal structure, morphology, and electrochemical performance of LiMnBO3/C composites are investigated. XRD results indicate that the samples consist of the monoclinic phase LiMnBO3 (m-LiMnBO3) and the hexagonal phase LiMnBO...
xLiVPO4F·yLi3V2(PO4)3/C cathode materials are prepared by a two-step carbon coating method. XRD results show that all the xLiVPO4F·yLi3V2(PO4)3/C composites (x:y ≠ 0) contain both LiVPO4F and Li3V2(PO4)3 phases, and no impurities are detected. SEM results show that the average primary size of the composites is 0.3–1 μm. All the composites show less aggregation than the single LiVPO4F/C and Li3V2(PO...
LiNi0.5Mn1.5O4 cathode material was prepared by electrospinning using lithium hydroxide, manganese acetate, nickel acetate, acetic acid, ethanol, and poly(vinyl pyrrolidone) as raw materials. The effect of calcination temperature on the structure, morphology, and electrochemical properties was investigated. XRD results indicate that the LiNi0.5Mn1.5O4 composite is well crystallized as a spinel structure...
LiMn1-xCrxPO4/C (x = 0, 0.01, 0.03, and 0.05) compounds are synthesized by a sol–gel combined ball milling method. The effects of Cr doping on the structure, morphology, and electrochemical performance of LiMnPO4 are investigated. XRD analysis results indicate that all the samples exhibit the single LiMnPO4 phase and Cr ions substitute on Mn site (x ≤ 0.03), with charge compensating vacancies on...
5LiFePO4⋅Li3V2(PO4)3/C composite cathode material is synthesized by a polyethylene glycol (PEG)-assisted rheological phase method. As a surfactant and dispersing agent, PEG can effectively inhabit the aggregation of colloidal particles during the formation of the gel. Meanwhile, PEG will coat on the particles to play the role of carbon source during the sintering. The samples are characterized by...
A series of mechanical mixture of lithium–iron–vanadium–phosphate compositions that can be represented in two-component notation, xLiFePO4·y Li3V2(PO4)3 (LFVP), has been evaluated as electrodes in lithium cells for x:y = 0:1, 1:1, 5:1, 10:1, and 1:0, in which an olivine component, LiFePO4 (LFP), and a monoclinic component, Li3V2(PO4)3 (LVP), coexisted. Powder X-ray diffraction (XRD) patterns show...
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