High-performance Ta-doped Li7La3Zr2O12 garnet oxides with AlN additive

Abstract

Garnet-type oxide is one of the most promising solid-state electrolytes (SSEs) for solid-state lithium-metal batteries (SSLMBs). However, the Li dendrite formation in garnet oxides obstructs the further development of the SSLMBs seriously. Here, we report a high-performance garnet oxide by using AlN as a sintering additive and Li as an anode interface layer. AlN with high thermal conductivity can promote the sintering activity of the garnet oxides, resulting in larger particle size and higher relative density. Moreover, Li3N with high ionic conductivity formed at grain boundaries and interface can also improve Li-ion transport kinetics. As a result, the garnet oxide electrolytes with AlN show enhanced thermal conductivity, improved ionic conductivity, reduced electronic conductivity, and increased critical current density (CCD), compared with the counterpart using Al2O3 sintering aid. In addition, Li symmetric cells and Li∣LiFePO4 (Li∣LFP) half cells using the garnet electrolyte with the AlN additive exhibit good electrochemical performances. This work provides a simple and effective strategy for high-performance SSEs.

Fast ion-conducting high-entropy garnet solid-state electrolytes with excellent air stability

“…Besides, pentavalent element doping (Ta and Nb) into LLZO can further enhance the room-temperature conductivity because of the increased amount of Li + vacancies as the hopping sites [39]. In addition, the activation energies of Li + migration in pellets were determined using the following equation [40] (Eq. ( 4)):…”

Double Perovskite La2MnNiO6 as a High‐Performance Anode for Lithium‐Ion Batteries

“…However, traditional LIBs could not meet the ever-increasing energy and safety demands for electric vehicles (EVs) up to now. [1][2][3][4][5] The low insertion/extraction kinetics of the graphite anode restricts the Li-ion diffusion, resulting in a weak rate capability and fast-charging performance. The low working potential (≈0.1 V versus Li + /Li) of graphite is close to lithium plating potential, possibly causing "dead" Li and lithium dendrite growth, which may cause fast capacity decay and serious safety issues.…”

LFP-based binder-free electrodes produced via fused filament fabrication

“…To address these concerns, two different strategies have been typically explored. On one hand, a great deal of effort focuses on improving both the electrochemical performance and stability of active materials and the search for novel compositions, as is the case of solid electrolytes, which are in the spotlight as they promise a radical advance in terms of safety [4,5]. On the other hand, performance enhancement may be achieved via manufacturing routes to maximise the volumetric and gravimetric energy density of the final devices [6,7].…”