Engendering High Energy Density LiFePO Electrodes with Morphological and Compositional Tuning.

Improving the energy density of Li-ion batteries is critical to meet the requirements of electric vehicles and energy storage systems. In this work, LiFePO active material was combined with single-walled carbon nanotubes as the conductive additive to develop high-energy-density cathodes for rechargeable Li-ion batteries. The effect of the morphology of the active material particles on the cathodes' electrochemical characteristics was investigated.

Rational Screening of High-Voltage Electrolytes and Additives for Use in LiNiMnO-Based Li-Ion Batteries.

In the present work, we focus onthe experimental screening of selected electrolytes, which have been reported earlier in different works, as a good choice for high-voltage Li-ion batteries. Twenty-four solutions were studied by means of their high-voltage stability in lithium half-cells with idle electrode (C+PVDF) and the LiNiMnO-based composite as a positive electrode. Some of the solutions were based on the standard 1 M LiPF in EC:DMC:DEC = 1:1:1 with/without additives, such as fluoroethylene carbonate, lithium bis(oxalate) borate and lithium difluoro(oxalate)borate.

Revisited TiNbO as an Anode Material for Advanced Li-Ion Batteries.

TiNbO with a tunnel-type structure is considered as a perspective negative electrode material for Li-ion batteries (LIBs) with theoretical capacity of 252 mAh g corresponding to one-electron reduction/oxidation of Ti and Nb, but only ≈160 mAh g has been observed practically. In this work, highly reversible capacity of 200 mAh g with the average (de)lithiation potential of 1.5 V vs Li/Li is achieved for TiNbO with pseudo-2D layered morphology obtained via thermal decomposition of the NHTiNbO intermediate prepared by K→ H→ NH cation exchange from KTiNbO.

Unlocking the Allometric Growth and Dissolution of Zn Anodes at Initial Nucleation and an Early Stage with Atomic Force Microscopy.

Zn anodes have gained intensive attention for their environmental-friendliness and high volumetric capacity but are limited by their severe dendrite formation. Understanding the initial nucleation behavior is critical for manipulating the uniform deposition of Zn. Herein, the allometric growth and dissolution of Zn in the initial nucleation and early stages are visualized with in situ atomic force microscopy in aqueous ZnCl electrolytes.

One-step synthesis of vanadium-doped anatase mesocrystals for Li-ion battery anodes.

Here we report a successful one-step synthesis of vanadium-doped anatase mesocrystals by reactive annealing of NHTiOF/PEG2000 mesocrystal precursors with NHVO. The formation solid solution TiVOwith vanadium content up to = 25 at% inheriting the structure of mesocrystals is observed for the first time. The doping mechanism via vapor phase transport of vanadium is proposed.