A Morphologically Stable Li/Electrolyte Interface for All-Solid-State Batteries Enabled by 3D-Micropatterned Garnet,Advanced Materials

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A Morphologically Stable Li/Electrolyte Interface for All-Solid-State Batteries Enabled by 3D-Micropatterned Garnet
Advanced Materials ( IF 27.4 ) Pub Date : 2021-10-10 , DOI: 10.1002/adma.202104009
Rong Xu ₁ , Fang Liu ₁ , Yusheng Ye ₁ , Hao Chen ₁ , Rachel Rae Yang _{1,

2} , Yinxing Ma ₁ , Wenxiao Huang ₁ , Jiayu Wan ₁ , Yi Cui _{1,

3}

Affiliation

Morphological degradation at the Li/solid-state electrolyte (SSE) interface is a prevalent issue causing performance fading of all-solid-state batteries (ASSBs). To maintain the interfacial integrity, most ASSBs are operated under low current density with considerable stack pressure, which significantly limits their widespread usage. Herein, a novel 3D-micropatterned SSE (3D-SSE) that can stabilize the morphology of the Li/SSE interface even under relatively high current density and limited stack pressure is reported. Under the pressure of 1.0 MPa, the Li symmetric cell using a garnet-type 3D-SSE fabricated by laser machining shows a high critical current density of 0.7 mA cm^–2 and stable cycling over 500 h under 0.5 mA cm^–2. This excellent performance is attributed to the reduced local current density and amplified mechanical stress at the Li/3D-SSE interface. These two effects can benefit the flux balance between Li stripping and creep at the interface, thereby preventing interfacial degradation such as void formation and dendrite growth.

中文翻译：

一种形态稳定的锂/电解质界面，用于由 3D 微图案石榴石实现的全固态电池

锂/固态电解质 (SSE) 界面的形态退化是导致全固态电池 (ASSB) 性能下降的普遍问题。为了保持界面完整性，大多数 ASSB 在低电流密度和相当大的堆压下运行，这极大地限制了它们的广泛使用。本文报道了一种新型的 3D 微图案 SSE (3D-SSE)，即使在相对较高的电流密度和有限的堆叠压力下也可以稳定 Li/SSE 界面的形态。在 1.0 MPa 的压力下，使用通过激光加工制造的石榴石型 3D-SSE 的 Li 对称电池显示出 0.7 mA cm ^{-2的高临界电流密度和 0.5 mA cm}^-2下超过 500 小时的稳定循环. 这种优异的性能归因于 Li/3D-SSE 界面处局部电流密度的降低和机械应力的放大。这两种效应有利于界面处锂剥离和蠕变之间的通量平衡，从而防止界面退化，如空隙形成和枝晶生长。

更新日期：2021-12-07

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