Li_1.4Al_0.4Ti_1.6(PO₄)₃-Modified Li₄Ti₅O₁₂ Anode for Lithium-Ion Storage with Enhanced Rate and Cycling Performance

Abstract

The capacity of Li 4 Ti 5 O 12 (LTO) at high rates is limited due to the polarization caused by its modest Li-ion (Li + ) diffusion coefficient and low electrical conductivity. Coating with ionic conductors is an available method to ameliorate charge transport. Li 1+x Al x Ti 2−x (PO 4 ) 3 ion conductors with thermal, chemical, and electrochemical stabilities have been proven to be modification materials for electrodes. Herein, the Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 (LATP) precursor dispersion with optimized preparation is applied to the surface modification of LTO by a dynamic mix-drying method. A proper amount of LATP ultrafine particle coating could develop the ion transport rate in the electrode and restrain side reactions. The 2 wt % LATP−LTO anode exhibits an optimized capacity of 168.2 mA h g −1 at 0.1 A g −1 and retains 96.7% of its capacity after 5000 cycles at 5.0 A g −1 , while the P-LTO anode retains 86.3% of the capacity. Improved Li + transport and interface stability in the electrodes lead to the boosted rate and cycling stability. The LATP-modified LTO composites provide a possibility for the further application of related materials in the energy storage field.

Dual-Channel-Ion Conductor Membrane for Low-Energy Lithium Extraction

“…Therefore, these similar values of the diffusion coefficients indicated the coupled transport of the cations and anions. The diffusion coefficient of the Li + ion of the dual-channel membrane was higher than the LATP membranes in dry conditions at room temperature due to the hydration of grain boundaries which reduced the ion transport resistance and provided additional pathways. − The diffusion pathways of the Cl – ion were combined by the AEPs and the bulk solution in the nanochannels. Therefore, the overall diffusion coefficient of Cl – ions with a low porosity of ∼4% was ∼1 order of magnitude lower than the common anion-exchange membranes. , The properties of the anions could also influence lithium transport.…”