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[2] viXra:2009.0161 [pdf] submitted on 2020-09-23 11:04:13
Authors: Sergey Sevtsov
Comments: 6 Pages.
The technical problem solved in [this work] is to create such an electrolyte so that the diffusion rates of its ions during charging and discharging are as close as possible in magnitude without taking into account the height of the electrolyte volume.
The technical result expected from the solution of the technical problem when using the claimed possible invention is an increase in the capacity and average voltage of the bit of lead-acid batteries.
Category: Chemistry
[1] viXra:2009.0081 [pdf] submitted on 2020-09-12 13:16:07
Authors: R. Köferstein
Comments: 23 Pages. The paper was published in: Journal of Solid State Chemistry 287 (2020) 121380 (DOI: 10.1016/j.jssc.2020.121380)
Nanocrystalline Li0.5Fe2.5O4 was prepared by a starch-based soft-chemistry synthesis. Calcining of the (LiFe)-gel between 350 and 1000 °C results in Li0.5Fe2.5O4 powders with crystallite sizes from 13 to 141 nm and specific surface areas between 35 and 7.1 m2 g-1. XRD investigations reveal the formation of ordered Li0.5Fe2.5O4. Sintering between 1050 and 1250 °C leads to ceramics with relative densities of 67-95 % consisting of grains between 0.3 and 54 μm. As the sintering temperature increases a rising weight loss of the ceramic samples was observed due to the loss of Li2O. Temperature-dependent magnetic measurements indicate a superparamagnetic behaviour for the nano-sized samples. Field-dependent measurements at 3 K of ceramics sintered between 1050 and 1200 °C show increasing saturation magnetization values (Ms) of 70.0 to 73.0 emu g-1 most likely due to the formation of lithium vacancies and a decrease of the inversion parameter. The magnetization drops down to 67.7 emu g-1 after sintering at 1250 °C caused by the formation of hematite. Diffuse reflectance spectra reveal an indirect allowed band gap decreasing from 1.93 to 1.60 eV depending on thermal treatment. DSC measurements of the order - disorder phase transition on nano-sized powders and bulk ceramics exhibit transition temperatures between 734 and 755 °C and enthalpy changes (H) ranging from 5.0 to 13.5 J g-1. The linear thermal expansion coefficient was found to be 11.4x10-6 K-1.
Category: Chemistry
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