Work

Enhancing the Dendritic Tolerance of NASICON-Based Electrolytes by Grain Boundary Engineering

Year: 2025

Type: article

Abstract: A grain boundary modification strategy relying on the liquid-sintering method is proposed for using NASICON-type ceramics Na 1+x Zr 2 Si x P 3-x O 12 as solid-state electrolytes (SSEs) for all-solid-state batteries (ASSBs). It is found that with the addition of Na 3 AlF 6, the grain boundaries of Na 3.3 Mg 0.15 Zr 1.85 Si 2 PO 12 ceramics (MNZSP) are filled with the amorphous and nanocrystalline phase reducing the electronic conductivity and improving the mechanical strength of the electrolyte. This effectively inhibits dendrite initiation and blocks sodium dendrite penetration. Besides, the grain boundary phase with high ionic conductivity is conducive to provide a continuous Na + transport path through the whole electrolyte. Thus, the symmetric cells represent a high critical current density (CCD) of 2.1 mA cm –2 and demonstrate extended cycling stability over 1200 h at 0.3 mA cm –2 . The high-load-capacity (99.1 mAh g –1 ) full-cells based on MNZSP demonstrate remarkable cycling stability for 200 cycles at 0.5 C. This grain boundary modification approach presents a promising pathway for developing practical high-performance SSEs.

Source: ACS Applied Materials & Interfaces

DOI: 10.1021/acsami.5c12799

Authors: Wei Shan, Jiayu Chen, Xiaoyang Wei, Bobba V. R. Chowdari, Xiangwei Wu, Zhaoyin Wen

Institutions: Chinese Academy of Sciences, Shanghai Institute of Ceramics, University of Chinese Academy of Sciences, Nanyang Technological University

Language: English

Topic: Advanced Battery Materials and Technologies

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: green

Funders: National Natural Science Foundation of China, Science and Technology Commission of Shanghai Municipality