Spatially controlled lithium utilization in anode-free all-solid-state batteries via diffusive interface
Journal
Nano Energy
Journal Volume
142
ISSN
2211-2855
Date Issued
2025-09
Author(s)
Abstract
The anode-free solid-state battery represents the perfect balance of safety, cost-effectiveness, and high energy density for future batteries. However, it encounters significant challenges that result in rapid capacity fade in performance. An in situ-formed Li-rich interlayer can establish a diffusive Li-ion dynamic interface where spatially distributed Li+ enclosing reduces the rate of void accumulation. Moreover, the uneven Li+ flux at the electrolyte interface can be uniform through the Li-rich diffusive interface, leading to uniform deposition of Li0 on the current collector. The garnet solid-electrolyte LLZO-Ta (Li6.75La3Zr1.75Ta0.25O12) has been explored in an all-solid anode-free battery fabrication with a focus on uniform lithium deposition governed by operating conditions through a 500 nm Indium interlayer for enhancing anode-free battery performance. The evolved internal pressure due to the Li–In intermetallic crystal phase change preserves the dimensional stability of the interlayer during Li+ diffusion. More Li utilization is achieved through Li–In interlayer without introducing an excess Li source or applying external stack pressure. A Li-rich interphase coupled with cycling protocols can provide more lithium accessibility during cycling in limited-capacity Li batteries.
Subjects
All-solid-state
Anode-free
Cycling protocols
Diffusive interlayers
Garnet
Internal pressure
SDGs
Publisher
Elsevier BV
Type
journal article