Lithium Diffusion Pathway in Li_1.3Al_0.3Ti_1.7(PO₄)₃ (LATP) Superionic Conductor

Abstract

The Al-substituted LiTi2(PO4)3 powders Li(1+x)Al(x)Ti(2-x)(PO4)3 (LATP) were successfully prepared by a water-based sol-gel process with subsequent calcination and sintering. The crystal structure of obtained samples was characterized at different temperatures using high-resolution synchrotron-based X-ray and neutron powder diffraction. Possible lithium diffusion pathways were initially evaluated using the difference bond-valence approach. Experimental 3D lithium diffusion pathway in LATP was extracted from the negative nuclear density maps reconstructed by the maximum entropy method. Evaluation of the energy landscape determining the lithium diffusion process in NASICON-type superionic conductor is shown for the first time.

Microwave-assisted reactive sintering and lithium ion conductivity of Li1.3Al0.3Ti1.7(PO4)3 solid electrolyte

“…It has been unambiguously demonstrated recently that lithium ion conduction involves both sites according to a M1-M3-M3-M1 zig zag pathway (Fig. 4b) [33,34]. The corresponding activation energy, calculated from data obtained by the maximum-entropy method (MEM), is 0.30 eV (maximum entropy method), which is equal to the value obtained in this work below 135 °C.…”

Ionic Conductivity of the NASICON‐Related Thiophosphate Na1+xTi2−xGax(PS4)3

“…All impedance data were fit with an equivalent circuit consisting of two parallel CPE/resistor elements in series with a CPE, representing the bulk, grain boundary and blocking electrodes, respectively. The capacitance of the high‐frequency CPE/resistor element is 6.4×10 −11 F cm −2 with an α‐value of≈0.85, representing the ideality of the CPE, and corroborating this to be a bulk‐process . At the lower frequency side of the bulk semicircle, a small grain boundary process is visible with a capacitance of 1.7×10 −7 F cm −2 .…”

Room temperature lithium superionic conductivity in high entropy oxides

“…2,3 Indeed, without liquid electrolyte, devices are safer and also comply with current environmental standards. [5][6][7][8][9][10][11][12][13][14] It has been shown recently that the entropic contribution to the Gibbs free energy can be used to stabilize new oxide phases, similarly to the situation that occurs in high entropy alloys. However, usual solid electrolytes are not sufficiently conductive to allow ultrafast charge/discharge rates (which are crucial for high power applications).…”