材料科学
纳米纤维
聚合物电解质
电解质
芳纶
聚合物
固态
离子
化学工程
纳米技术
复合材料
工程物理
电极
纤维
离子电导率
有机化学
物理化学
化学
工程类
作者
Lehao Liu,Jing Lyu,Jinhan Mo,Hejin Yan,Lele Xu,Peng Peng,Jingru Li,Bing Jiang,Lihua Chu
出处
期刊:Nano Energy
[Elsevier]
日期:2020-03-01
卷期号:69: 104398-104398
被引量:87
标识
DOI:10.1016/j.nanoen.2019.104398
摘要
Abstract Satisfactory ionic conductivity and mechanical stability are the prerequisites for the applications of solid polymer electrolytes in Li-ion batteries. Herein, by using aramid nanofibers (ANFs) as multifunctional nano-additives, comprehensively-upgraded polyethylene oxide (PEO)-LiTFSI electrolytes with 3D ANF network frames are achieved through the hydrogen-bond interactions between the 1D ANFs. The hydrogen-bond interactions between the ANFs and the PEO chains and TFSI‒ anions can greatly prevent the ANF agglomeration, suppress the PEO crystallization, facilitate the LiTFSI dissociation, and prolong the ion transport paths at the 3D ANF framework/PEO-LiTFSI interfaces. Thus, the ANF-modified electrolytes show superior room-temperature conductivity of 8.8 × 10−5 S cm−1. The ANF-containing composite electrolytes also display greatly-enhanced mechanical strength, thermostability, electrochemical stability and interfacial resistance against Li dendrites, attributed to the 3D ANF framework. In consequence, the composite electrolyte-based LiFePO4/Li cells exhibit better rate performance and cycling stability (e.g., 135 mAh g−1 after 100 cycles at 0.4 C). This work offers a novel and effective strategy to comprehensively upgrade polymer electrolytes by employing organic nanofillers in the composite electrolyte design and revealing the ion transport mechanism for promising all-solid-state Li-ion battery applications.
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