Visualizing Chemomechanical Degradation of a Solid-State Battery Electrolyte
Visualizing Chemomechanical Degradation of a Solid-State Battery Electrolyte
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固态电池电解质化学机械降解的可视化
DOI：
10.1021/acsenergylett.9b00816
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发表时间：
2019
影响因子：
22
通讯作者：
McDowell, Matthew T.
中科院分区：
文献类型：
--
作者：
Tippens, Jared;Miers, John C.;Afshar, Arman;Lewis, John A.;Cortes, Francisco Javier;Qiao, Haipeng;Marchese, Thomas S.;Di Leo, Claudio V.;Saldana, Christopher;McDowell, Matthew T.
固态电解质（SSE）和锂金属电极之间的界面处的转变可导致固态电池循环期间的高阻抗和容量衰减，但界面的结构/化学/机械演变与电化学之间的联系尚不清楚。在这里，我们使用原位X射线计算机断层扫描，以揭示在锂1 + xAlxGe 2-x（PO 4）3（LAGP）SSE在电化学循环过程中的相间生长所造成的机械损伤的演变。与膨胀体积驱动器在这种材料中的断裂的界面相的生长，并在循环过程中的断裂的程度被发现是导致阻抗增加的主要因素，而不是界面相本身的电阻。观察到裂纹开始附近的锂/LAGP接口，这与模拟的边缘。这里研究的界面生长的化学力学效应预计将在各种SSE材料中发挥作用，这项工作是朝着设计持久界面迈出的一步。
Transformations at interfaces between solid-state electrolytes (SSEs) and lithium metal electrodes can lead to high impedance and capacity decay during cycling of solid-state batteries, but the links between structural/chemical/mechanical evolution of interfaces and electrochemistry are not well understood. Here, we use in situ X-ray computed tomography to reveal the evolution of mechanical damage within a Li1+xAlxGe2–x(PO4)3(LAGP) SSE caused by interphase growth during electrochemical cycling. The growth of an interphase with expanded volume drives fracture in this material, and the extent of fracture during cycling is found to be the primary factor causing the impedance increase, as opposed to the resistance of the interphase itself. Cracks are observed to initiate near the edge of the lithium/LAGP interface, which agrees with simulations. The chemomechanical effects of interphase growth studied here are expected to play a role in a variety of SSE materials, and this work is a step toward designing durable interfaces.
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影响因子：
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作者：
Oluwadamilola O. Taiwo;M. Loveridge;S. Beattie;D. Finegan;R. Bhagat;D. Brett;P. Shearing
通讯作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
McDowell, Matthew T.
影响因子：
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