© 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited. Lithium metal is a high-energy-density battery electrode material, but the largely irreversible growth of lithium protrusions on an initially planar electrode during cycling makes it unsuitable for incorporation into a commercial battery. In this study, a lithium electrode with globular protrusions was stripped electrochemically, and the local morphology of the electrode as a function of time was determined by hard X-ray tomography. We demonstrate that globules are preferentially stripped compared to a planar electrode in our system, which incorporates a nanostructured block copolymer electrolyte. We report current density at the electrode as a function of micron-scale position and time. The local current density during the electrode healing process calculated from a reference frame at the electrode/electrolyte interface provides insight into the driving forces responsible for selective stripping of the globule. These results imply the possibility of discharging protocols that may return a lithium electrode to its initial planar state.

中文翻译：

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锂突起的优先剥离导致平面电极的恢复

© 2020 作者。由 IOP Publishing Limited 代表电化学学会出版。锂金属是一种高能量密度的电池电极材料，但在循环过程中最初平面电极上锂突起的大部分不可逆增长使其不适合并入商业电池。在这项研究中，具有球状突起的锂电极被电化学剥离，电极的局部形态作为时间的函数通过硬 X 射线断层扫描确定。我们证明，与我们系统中的平面电极相比，小球优先被剥离，其中包含纳米结构的嵌段共聚物电解质。我们将电极处的电流密度报告为微米级位置和时间的函数。从电极/电解质界面处的参考系计算的电极愈合过程中的局部电流密度提供了对负责选择性剥离小球的驱动力的洞察。这些结果意味着放电协议可能会使锂电极恢复到其初始平面状态。