For all energies, dσ/dΩ = r*e*^2 at zero angle, both classically and quantum mechanically.
This came up in my radiation interactions class today, and the prof didn't have a good answer either. I get that the low-energy case has to reduce to the classical limit, but see no obvious reason why it has to be so at low-angle even at high energies.
I read lots and lots of DAE posts that usually go along the lines of "I like sex and money. DAE like sex and money?" and I thought it would be nice to water down it a little.
The statement is true though and is the reason for the existence of superconductors. Through the Cooper instability mechanism.
Lithium is big here on this sub but haven't seen much on LIS since it's arguably overhyped launch.
It's slid a fair bit since it's listing but I've just come across this article that could significantly increase their capacity.
https://newatlas.com/energy/kevlar-fibers-lithium-sulfur-battery-five-times-capacity/
Does anyone hold or have any views on LIS?
A lot of electric batteries for cars are based on lithium. Sodium has some advantages including its more abundant and easy to extract, and can be used without cobalt (expensive). Note that its possible to have cobalt free lithium iron like BYD (https://cleantechnica.com/2020/08/12/byd-takes-its-all-new-han-to-stuttgart-for-some-street-cred/)
Sodium however have limitations.
>Sodium ions have a more significant volume and higher requirements for materials’ structural stability and kinetic characteristics than lithium ions.
>
>Because sodium is three times heavier than lithium, sodium-ion batteries are likewise heavier, despite lithium accounting for less than 5% of a battery’s overall weight.
>
>Because of the 0.3-volt lower cell voltage, sodium batteries lose roughly 10% of their energy density, making them less potent. This is partly because previous graphite anodes used in batteries absorbed far too little sodium.
>
>The industrialization of sodium-ion batteries has hit a snag because of this.
Further reading the first Na ion battery was a French effort which had power density of 90 Watt hours per kg in 2015
https://news.cnrs.fr/articles/a-battery-revolution-in-motion
This article in 2020 (https://pubs.acs.org/doi/10.1021/acsenergylett.0c02181) predicted Na ion batteries would reach 150 Watt hours / kg which would be comparable to closer to that of Li-ion cells with LiFePO4 cathode.
By 2021 CATL made Na ion batteries with 160 Watt hours / kg (https://www.electronicdesign.com/markets/automotive/article/21171384/electronic-design-sodiumion-batteries-achieve-160whkg-energy-density-fast-charging) and note that CATL supplies lithium-iron-phosphate (LFP) with 200 Watt hours / kg to Tesla.
Now in early 2022 CATL has filed a patent for a Na ion battery with 200 Watt hours / kg
(https://c
... keep reading on reddit ➡
Molecular‐level understanding of transport and adsorption mechanisms of electrolyte ions in nanoporous electrodes under applied potentials is essential to control the performance of double layer capacitors for rapidly emerging high power energy storage. Here in operando small angle neutron scattering (SANS) is used to directly detect ion movements into the nanopores of a conductive metal‐organic framework (MOF) electrode under operating conditions. Neutron scattering data reveals that most of the void space within the MOF is accessible to the solvent. Upon the addition of the electrolyte NaOTF, the ions are adsorbed on the outer surface of the protrusions to form a 30 Å layer instead of entering the ionophobic pores in the absence of an applied charging potential. The changes in scattering intensity when potentials are applied suggests the ion rearrangement in the micropores following different mechanisms depending on the electrode polarization. These observations shed new insights on ion electrosorption in electrode materials.
https://ift.tt/39FA7y6
Ion arrangements in a conductive metal–organic framework (MOF) electrode are examined with in operando neutron scattering, as reported by L. He et al. in their Research Article (DOI: https://doi.org/10.1002/anie.20191620110.1002/anie.201916201). The non‐destructive method provides direct and accurate information on the multi‐length scale morphology of the dry MOF, the pore accessibility upon soaking with solvent and electrolyte, and the changes in species confined within the micropores under operating conditions.
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... keep reading on reddit ➡Ion arrangements in a conductive MOF electrode are examined with in operando neutron scattering. The non‐destructive method provides direct and accurate information on the multi‐length scale morphology of the dry MOF, the pore accessibility upon soaking with solvent and electrolyte, and the changes in species confined within the micropores under operating conditions.
Abstract
A molecular‐level understanding of transport and adsorption mechanisms of electrolyte ions in nanoporous electrodes under applied potentials is essential to control the performance of double‐layer capacitors. Here, in operando small‐angle neutron scattering (SANS) is used to directly detect ion movements into the nanopores of a conductive metal–organic framework (MOF) electrode under operating conditions. Neutron‐scattering data reveals that most of the void space within the MOF is accessible to the solvent. Upon the addition of the electrolyte sodium triflate (NaOTf), the ions are adsorbed on the outer surface of the protrusions to form a 30 Å layer instead of entering the ionophobic pores in the absence of an applied charging potential. The changes in scattering intensity when potentials are applied suggests the ion rearrangement in the micropores following different mechanisms depending on the electrode polarization. These observations shed insights on ion electrosorption in electrode materials.
https://ift.tt/39FA7y6
