Polymerized Ionic Liquid-Containing Interpenetrating Network Solid Polymer Electrolytes for All-Solid-State Lithium Metal Batteries
Polymerized Ionic Liquid-Containing Interpenetrating Network Solid Polymer Electrolytes for All-Solid-State Lithium Metal Batteries
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DOI：
10.1021/acsami.9b09985
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发表时间：
2019-09-25
影响因子：
9.5
通讯作者：
Li, Christopher Y.
中科院分区：
文献类型：
--
作者：
Li, Xiaowei;Zheng, Yongwei;Li, Christopher Y.
锂离子电池在循环过程中锂沉积不均匀，阻碍了高能量密度金属锂电池的实际应用。为了缓解这一过程，在本工作中，通过将聚合离子液体(PIL)、聚(二烯丙基二甲基铵)双(三氟甲磺酰亚胺)引入多面体低聚倍半硅氧烷-聚乙二醇基网络固体聚合物电解质(IPN SPE)，制备了互穿聚合物网络固体聚合物电解质(IPN SPE)。与原始的SPE相比，新开发的IPN SPE表现出更好的离子导电性、优异的锂树枝晶电阻和优越的电池性能，这归功于含有PIL的IPN提供的均匀的、固定的离子网络。此外，通过恒电流循环和极化测量，在低于和高于基于Chazalviel模型估计的沙子临界电流密度时，定量地描述了离子电导率和均匀离子分布的影响。全电池测试也显示出出色的放电容量、循环寿命和库仑效率。我们的结果表明，含有PIL的IPN SPE为稳定锂电沉积和制备高性能LMBs提供了一个很有前途的体系。
The practical application of lithium metal batteries (LMBs) with high energy density is hindered by uneven lithium deposition during battery cycling. To mitigate this process, in this work, an interpenetrating polymer network solid polymer electrolyte (IPN SPE) is prepared by introducing a polymerized ionic liquid (PIL), poly(diallyldimethylammonium) bis(trifluoromethanesulfonyl)imide to a polyhedral oligomeric silsesquioxane-poly(ethylene glycol)-based network SPE. Compared with the virgin SPE, the newly developed IPN SPE exhibited improved ionic conductivity, excellent lithium dendrite resistance, and superior battery performance, which was attributed to the homogeneous, immobilized ion network provided by the PIL-containing IPN. Furthermore, the effects of ionic conductivity and homogenized ion distribution were quantitatively delineated by galvanostatic cycling and polarization measurements at current densities that were below and above the estimated Sand's critical current density based on the Chazalviel model. Full battery tests also showed excellent discharge capacity, cycle life, and Coulombic efficiency. Our results suggest that the PIL-containing IPN SPEs provide a promising system for stabilizing lithium electrodeposition and fabricating high-performance LMBs.