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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Sci+Adv
2017 ; 3
(4
): e1601659
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English Wikipedia
Toward garnet electrolyte-based Li metal batteries: An ultrathin, highly
effective, artificial solid-state electrolyte/metallic Li interface
#MMPMID28435874
Fu KK
; Gong Y
; Liu B
; Zhu Y
; Xu S
; Yao Y
; Luo W
; Wang C
; Lacey SD
; Dai J
; Chen Y
; Mo Y
; Wachsman E
; Hu L
Sci Adv
2017[Apr]; 3
(4
): e1601659
PMID28435874
show ga
Solid-state batteries are a promising option toward high energy and power
densities due to the use of lithium (Li) metal as an anode. Among all solid
electrolyte materials ranging from sulfides to oxides and oxynitrides, cubic
garnet-type Li(7)La(3)Zr(2)O(12) (LLZO) ceramic electrolytes are superior
candidates because of their high ionic conductivity (10(-3) to 10(-4) S/cm) and
good stability against Li metal. However, garnet solid electrolytes generally
have poor contact with Li metal, which causes high resistance and uneven current
distribution at the interface. To address this challenge, we demonstrate a
strategy to engineer the garnet solid electrolyte and the Li metal interface by
forming an intermediary Li-metal alloy, which changes the wettability of the
garnet surface (lithiophobic to lithiophilic) and reduces the interface
resistance by more than an order of magnitude: 950 ohm·cm(2) for the pristine
garnet/Li and 75 ohm·cm(2) for the surface-engineered garnet/Li.
Li(7)La(2.75)Ca(0.25)Zr(1.75)Nb(0.25)O(12) (LLCZN) was selected as the
solid-state electrolyte (SSE) in this work because of its low sintering
temperature, stabilized cubic garnet phase, and high ionic conductivity. This low
area-specific resistance enables a solid-state garnet SSE/Li metal configuration
and promotes the development of a hybrid electrolyte system. The hybrid system
uses the improved solid-state garnet SSE Li metal anode and a thin liquid
electrolyte cathode interfacial layer. This work provides new ways to address the
garnet SSE wetting issue against Li and get more stable cell performances based
on the hybrid electrolyte system for Li-ion, Li-sulfur, and Li-oxygen batteries
toward the next generation of Li metal batteries.