Ultrathin zwitterionic polymeric interphases for stable lithium metal anodes
Ultrathin zwitterionic polymeric interphases for stable lithium metal anodes
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DOI：
10.1016/j.matt.2021.09.025
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发表时间：
2021-10
期刊：
影响因子：
18.9
通讯作者：
S. Stalin;Pengyu Chen;Gaojin Li;Yue Deng;Zachary W Rouse;Yifan Cheng;Zheyuan Zhang;Prayag Biswal;Shuo Jin;S. Baker;Rong Yang;L. Archer
中科院分区：
文献类型：
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作者：
S. Stalin;Pengyu Chen;Gaojin Li;Yue Deng;Zachary W Rouse;Yifan Cheng;Zheyuan Zhang;Prayag Biswal;Shuo Jin;S. Baker;Rong Yang;L. Archer
锂金属电沉积物以不规则形态特征的形式，松散地称为枝晶，在平面阳极基底上。这些沉积物可能导致电池快速失效和安全问题。由于Li的高度还原性（相对于标准氢电极[SHE]为-3.04 V），在电极/电解质界面处不可避免地形成固体电解质中间相（SEI），其调节Li的后续电沉积。合理设计SEI膜的化学、机械和离子输运性质对确定电沉积金属的形貌起着重要作用。我们报告使用引发的化学气相沉积（iCVD），以创建精确的厚度在10-500 nm的范围内的共形两性离子聚合物界面。发现两性离子部分能够调节锂阳离子在电极/电解质界面处的溶剂化环境，从而实现锂金属的紧凑、平面沉积。这些发现为金属阳极的离子聚合物界面的设计提供了新的方向。
Lithium metal electrodeposits in the form of irregular morphological features, loosely termed dendrites, on planar anode substrates. The deposits may lead to rapid battery failure and safety concerns. Due to the highly reducing nature of Li (−3.04 V versus standard hydrogen electrode [SHE]), a solid electrolyte interphase (SEI) inevitably forms at the electrode/electrolyte interface, which regulates the subsequent electrodeposition of Li. Rational design of the chemical, mechanical, and ion transport properties of SEI plays an important role in determining the morphology of electrodeposited metals. We report on using initiated chemical vapor deposition (iCVD) to create ultrathin conformal zwitterionic polymeric interphases with precise thicknesses in the range of 10–500 nm. It was found that zwitterionic moieties are able to tune the solvation environment of the lithium cation at the electrode/electrolyte interface, enabling compact, planar deposition of the lithium metal. These findings provide new directions for designing ionic polymeric interphases for metal anodes.