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Atomic interlamellar ion path in polymeric separator enables long-life and dendrite-free anode in lithium ion batteries
Journal of Power Sources ( IF 9.2 ) Pub Date : 2020-01-21 , DOI: 10.1016/j.jpowsour.2020.227773
Junying Zhao , Dongjiang Chen , Bismark Boateng , Guangfeng Zeng , Yupei Han , Cheng Zhen , John B. Goodenough , Weidong He

Separator-lithium anode interface featured with uniform lithium-ion plating/stripping is of paramount importance for the safe operation of batteries. Lithium anode paired with traditional polyolefin separator is considerably challenged with uncontrolled formation of Li dendrites, giving rise to undesirable rate capacity and cycle life. In this work, through an electrophoretic deposition technique, hexafluoropropylene separator embedded with atomic interlamellar lithium-channel phyllosilicate clay is realized. With large absorption with electrolyte, the separator with interlamellar spacing of 1.31 nm provides abundant active sites for Li+ and enables fast transfer of lithium ions, giving rise to an ionic conductivity of 5.66 × 10−4 S cm−1 at ambient temperature. The parallel interlayers unify the direction of Li+ flows, which leads to the uniform deposition of Li+ on the anode and effectively eliminates lithium dendrite issues in Li+ plating/stripping processes. The cell assembled with the robust polymer/clay separator is more advantageous than state-of-the-art in the literature, delivering a reversible capacity of 152 mAh g−1 with a 98.5% capacity retention after 300 cycles at 0.5C.



中文翻译:

聚合物隔膜中的原子层间离子通道可实现锂离子电池中的长寿命且无枝晶的阳极

具有均匀的锂离子镀层/剥离特性的隔板-锂阳极界面对于电池的安全运行至关重要。与传统的聚烯烃隔膜配对的锂阳极受到锂枝晶形成不受控制的挑战,从而导致不希望的倍率容量和循环寿命。在这项工作中,通过电泳沉积技术,实现了嵌入原子间层状锂通道层状硅酸盐粘土的六氟丙烯隔膜。电解质吸收量大,层间间距为1.31 nm的隔膜为Li +提供了丰富的活性位,并能够快速转移锂离子,从而产生了5.66×10 -4  S cm -1的离子电导率。在环境温度下。平行的中间层统一了Li +的流动方向,从而导致Li +在阳极上的均匀沉积,并有效消除了Li +电镀/剥离过程中的锂枝晶问题。与坚固的聚合物/粘土隔板组装在一起的电池比文献中的最新技术更具优势,在0.5C下300次循环后,可逆容量为152 mAh g -1,容量保持率为98.5%。

更新日期:2020-01-22
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