Ionic Conductivity Enhancement of Polymer Electrolytes with Ceramic Nanowire Fillers
Ionic Conductivity Enhancement of Polymer Electrolytes with Ceramic Nanowire Fillers
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DOI：
10.1021/acs.nanolett.5b00600
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发表时间：
2015-04-01
期刊：
影响因子：
10.8
通讯作者：
Cui, Yi
中科院分区：
文献类型：
--
作者：
Liu, Wei;Liu, Nian;Cui, Yi
与传统的液体电解质相比，固态电解质在锂离子电池的安全性和电化学稳定性方面有了实质性的改善，这使其成为下一代高能电池的有前途的替代技术。目前，锂离子在固体电解质中的低迁移率限制了其实际应用。在过去的几十年中，对陶瓷纳米颗粒分散到聚合物基体中的持续研究已被证明是有效的，以提高离子导电性，虽然它是具有挑战性的，以形成有效的离子导电网络与纳米颗粒。在这项工作中，我们首先报告说，陶瓷纳米线填料可以促进在聚合物基固体电解质中形成这样的离子导电网络，以提高其离子电导率三个数量级。在聚丙烯腈-LiClO 4中加入15wt%Li_（0.33）La_（0.557）TiO_3纳米线复合电解质，室温下的离子电导率达到2.4 × 10 ~（-4）S cm ~（-1），这是由于陶瓷纳米线作为导电网络在聚合物基体中的快速离子输运。此外，陶瓷-纳米线填充的复合聚合物电解质显示出扩大的电化学稳定窗口相比，没有填料。本工作的发现为设计具有上级性能的固体离子电解质铺平了道路。
Solid-state electrolytes provide substantial improvements to safety and electrochemical stability in lithium-ion batteries when compared with conventional liquid electrolytes, which makes them a promising alternative technology for next-generation high-energy batteries. Currently, the low mobility of lithium ions in solid electrolytes limits their practical application. The ongoing research over the past few decades on dispersing of ceramic nanoparticles into polymer matrix has been proved effective to enhance ionic conductivity although it is challenging to form the efficiency networks of ionic conduction with nanoparticles. In this work, we first report that ceramic nanowire fillers can facilitate formation of such ionic conduction networks in polymer-based solid electrolyte to enhance its ionic conductivity by three orders of magnitude. Polyacrylonitrile-LiClO4 incorporated with 15 wt % Li0.33La0.557TiO3 nanowire composite electrolyte exhibits an unprecedented ionic conductivity of 2.4 x 10(-4) S cm(-1) at room temperature, which is attributed to the fast ion transport on the surfaces of ceramic nanowires acting as conductive network in the polymer matrix. In addition, the ceramic-nanowire filled composite polymer electrolyte shows an enlarged electrochemical stability window in comparison to the one without fillers. The discovery in the present work paves the way for the design of solid ion electrolytes with superior performance.