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Fluoroethylene carbonate-Li-ion enabling composite solid-state electrolyte and lithium metal interface self-healing for dendrite-free lithium deposition.

Fluoroethylene carbonate-Li-ion enabling composite solid-state electrolyte and lithium metal interface self-healing for dendrite-free lithium deposition.

Authors :
Li, Haoyu
Liu, Wen
Yang, Xiaodan
Xiao, Junyu
Li, Yongliang
Sun, Lingna
Ren, Xiangzhong
Zhang, Peixin
Mi, Hongwei
Source :
Chemical Engineering Journal. Mar2021, Vol. 408, pN.PAG-N.PAG. 1p.
Publication Year :
2021

Abstract

• Li 0.35 La 0.55 TiO 3 (LLTO) are synthesized by sol-gel method and two-step calcination. • LLTO-(PEO-FEC) possess high Li+ conductivity vs low electronic conductivity at 25 °C. • LLTO-(PEO-FEC) show a wide electrochemical window of 5.2 V (vs. Li+/Li). • FEC-Li+ coordination enables interface self-healing and dendrite-free Li deposition. Solid-state Li-metal batteries have attracted much attention owing to the high energy density and safety afforded by Li-metal anode and solid-state electrolytes. However, Li-dendrite penetration and unstable interface between solid-state electrolyte and Li-metal incumber their application. Herein, fluoroethylene carbonate (FEC) added Li 0.35 La 0.55 TiO 3 -Poly (ethylene oxide) (LLTO-(PEO-FEC)) composite solid-state electrolytes (CSSEs) are fabricated to address the bottlenecks. The CSSE possesses high Li+ conductivity of 1.13 × 10−4 S·cm−1 vs low electronic conductivity of 1.68 × 10−9 S·cm−1 at 25 °C, presents a wide electrochemical window of 5.2 V (vs. Li+/Li), and shows much more stable lithium deposition at current density of 0.2 mA·cm−2 for 800 h. FEC is driven by Li+ to the damaged interface to form new LiF-rich interface layer, which enables the self-healing of Li-metal and CSSE interface and enhances the electrochemical stability of CSSEs against Li-metal. Li| (LLTO-(PEO-FEC)) |LiFePO 4 cell presents discharge capability of about 115 mAh·g−1 after 100 cycles at 50 °C. This work reveals the mechanism of dendrite-free Li deposition via interface self-healing process under the effect of FEC–Li+ coordination and provides a promising way to prepare the high performances composite solid-state electrolytes and to fabricate the dendrite-free all-solid-state lithium battery. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
13858947
Volume :
408
Database :
Academic Search Index
Journal :
Chemical Engineering Journal
Publication Type :
Academic Journal
Accession number :
148120935
Full Text :
https://doi.org/10.1016/j.cej.2020.127254