Open AccessEngineering Ferroelectric Interlayer between Li 1. 3 Al 0 . 3 Ti 1 .7 ( PO 4 ) 3 and Lithium Metal for Stable Solid‐State Batteries Operating at Room Temperature
Author(s) -
Gu Tian,
Chen Likun,
Huang Yanfei,
Ma Jiabin,
Shi Peiran,
Biao Jie,
Liu Ming,
Lv Wei,
He Yanbing
Publication year - 2023
Publication title -
energy and environmental materials
Language(s) - English
Resource type - Journals
ISSN - 2575-0356
DOI - 10.1002/eem2.12531
Subject(s) - materials science , anode , lithium (medication) , metal , ferroelectricity , ceramic , electrolyte , chemical engineering , composite number , nanotechnology , composite material , electrode , dielectric , optoelectronics , metallurgy , chemistry , medicine , engineering , endocrinology
The poor contact and side reactions between Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) and lithium (Li) anode cause uneven Li plating and high interfacial impendence, which greatly hinder the practical application of LATP in high‐energy density solid‐state Li metal batteries. In this work, a multifunctional ferroelectric BaTiO 3 (BTO)/poly(vinylidene fluoride‐co‐trifluoroethylene‐co‐chlorotrifluoroethylene) (P[VDF‐TrFE‐CTFE]) composite interlayer (B‐TERB) is constructed between LATP and Li metal anode, which not only suppresses the Li dendrite growth, but also improves the interfacial stability and maintains the intimate interfacial contact to significantly decrease the interfacial resistance by two orders of magnitude. The B‐TERB interlayer generates a uniform electric field to induce a uniform and lateral Li deposition, and therefore avoids the side reactions between Li metal and LATP achieving excellent interface stability. As a result, the Li/LATP@B‐TERB/Li symmetrical batteries can stably cycle for 1800 h at 0.2 mA cm −2 and 1000 h at 0.5 mA cm −2 . The solid‐state LiFePO 4 /LATP@B‐TERB/Li full batteries also exhibit excellent cycle performance for 250 cycles at 0.5 C and room temperature. This work proposes a novel strategy to design multifunctional ferroelectric interlayer between ceramic electrolytes and Li metal to enable stable room‐temperature cycling performance.