Issue 18, 2024

Field-responsive grain boundary against dendrite penetration for all-solid-state batteries

Abstract

All-solid-state-lithium-batteries (ASSLBs) using crystalline solid electrolytes (e.g., garnet-type Li7La3Zr2O12, LLZO) are promising electrochemical energy storage systems. However, Li penetration within the solid-state electrolytes (SSEs) due to a large electric field gradient and local electronic conductivity at the crystal grain boundary (GB) causes quick cell failures. Here, we design a field-responsive GB with ferroelectric materials for crystalline SSEs to prevent Li nucleation via a weakened local electric field. Additionally, the mixed-conducting interlayer formed at the Li/BaTiO3-modified LLZO (BTO–LZ) interface is favorable for homogenizing the interfacial Li+ flux. As a result, Li penetration through the bulk SSE can be effectively suppressed with an ultra-high critical current density of 6.1 mA cm−2. ASSLBs with a low interfacial resistance, high capacity and rate performance can be realized using the BTO–LZ electrolyte and thermally soldered LiCoO2. This study offers a generic strategy against dendrites in various solid-state batteries.

Graphical abstract: Field-responsive grain boundary against dendrite penetration for all-solid-state batteries

Supplementary files

Article information

Article type
Paper
Submitted
01 Jul 2024
Accepted
24 Jul 2024
First published
01 Aug 2024

Energy Environ. Sci., 2024,17, 6707-6716

Field-responsive grain boundary against dendrite penetration for all-solid-state batteries

B. Xiong, X. Liu, Q. Nian, Z. Wang, Y. Zhu, X. Luo, J. Jiang, D. Ruan, J. Ma, J. Jiang, Y. Cheng, C. Li and X. Ren, Energy Environ. Sci., 2024, 17, 6707 DOI: 10.1039/D4EE02853H

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