Interface engineering of sulfide electrolytes for all-solid-state lithium batteries
Interface engineering of sulfide electrolytes for all-solid-state lithium batteries
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DOI：
10.1016/j.nanoen.2018.09.061
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发表时间：
2018-11-01
期刊：
影响因子：
17.6
通讯作者：
Wang, Chunsheng
中科院分区：
文献类型：
--
作者：
Xu, Ruochen;Han, Fudong;Wang, Chunsheng
采用硫化物固体电解质的全固态锂电池（ASSLIB）由于其高安全性和能量密度而具有很高的希望取代传统的液体电解质LIB。然而，在硫化物电解液中Li枝晶的生长限制了ASSLIB高能量的实现。在本工作中，我们使用LiF（或LiI）层在锂和硫化物电解液之间的界面处，并渗透HFE（或I溶液）内部的硫化物电解液来抑制锂枝晶生长。由于LiF/Li比LiI/Li具有更高的界面能，LiF中间层对Li枝晶的抑制能力比LiI高得多。即使Li枝晶突破LiF（或LiI）夹层，Li枝晶也将被涂覆/穿透的HEF（或I）消耗，形成LiF（或LiI），从而防止Li枝晶生长。采用HFE涂覆/渗透的Li 7 P3 S11玻璃陶瓷作为电解质，LiF涂覆的Li金属作为阳极的LiNbO3@LiCoO2/Li 7 P3 S11/Li ASSLIB显示出在0.1mA cm（-2）下118.9mAh g（-1）的高可逆放电容量，并且在100次循环后保持96.8mAh g（-1）。在锂和固体电解质之间设计的具有高界面能的固体电解质界面为锂金属电池的商业化提供了新的机会。
All-solid-state lithium batteries (ASSLIBs) employing sulfide solid electrolyte hold high promise to replace traditional liquid-electrolyte LIBs due to their high safety and energy density. However, Li dendritic growth in sulfide electrolyte limits the realization of the high energy of ASSLIBs. In this work, we use LiF (or LiI) layer at the interface between Li and sulfide electrolyte and penetrated HFE (or I solution) inside of sulfide electrolyte to suppress the Li dendrite growth. Due to the higher interface energy of LiF/Li than that of LiI/Li, LiF interlayer show much higher capability than LiI in suppressing the Li dendrite. Even if the Li dendrite breaks through LiF (or LiI) interlayer, the Li dendrites will be consumed by coated/penetrated HEF (or I) forming LiF (or LiI) thus preventing Li dendrite growth. A LiNbO3 @ LiCoO2/Li7P3S11/Li ASSLIB employing HFE coated/infiltrated Li7P3S11 glass-ceramic as electrolyte, and LiF coated Li metal as anode shows a high reversible discharge capacity of 118.9 mAh g(-1) at 0.1 mA cm(-2) and retains 96.8 mAh g(-1) after 100 cycles. The designed solid electrolyte interphase between Li and solid electrolyte that has a high interface energy to Li provides new opportunity to commercialize the Li metal batteries.