Anion-immobilized solid composite electrolytes based on metal-organic frameworks and superacid ZrO_(2) fillers for high-performance all solid-state lithium metal batteries  

作　　者：Tao Wei Zao-hong Zhang Qi Zhang Jia-hao Lu Qi-ming Xiong Feng-yue Wang Xin-ping Zhou Wen-jia Zhao Xiang-yun Qiu 

机构地区：[1]School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang 212003,China [2]Institute of Mechanics and Energy,National Research Ogarev Mordovia State University,Saransk 430000,Russia [3]Jiangsu University Jingjiang College,Zhenjiang 212003,China [4]Department of Chemistry,College of Science,Nanjing Agricultural University,Nanjing 210095,China [5]Power&Energy Storage System Research Center,College of Mechanical and Electrical Engineering,Qingdao University,Qingdao 266071,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2021年第10期1636-1646,共11页矿物冶金与材料学报（英文版）

基　　金：financially supported by National Natural Science Foundation of China(No.21701083);Zhenjiang Key Laboratory of Marine Power Equipment Performance(SS2018006);The Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.SJCX19_0612);Project of Jiangsu University(High-Tech Ship)Collaborative Innovation Center(2019,1174871801-11).

摘　　要：Anion-immobilized solid composite electrolytes(SCEs)are important to restrain the propagation of lithium dendrites for all solid-state lithium metal batteries(ASSLMBs).Herein,a novel SCEs based on metal-organic frameworks(MOFs,UiO-66-NH_(2))and superacid ZrO_(2)(S-ZrO_(2))fillers are proposed,and the samples were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),thermo-gravimetric analyzer(TGA)and some other electrochemical measurements.The-NH_(2) groups of UiO-66-NH_(2) combines with F atoms of poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)chains by hydrogen bonds,leading to a high electrochemical stability window of 5 V.Owing to the incorporation of UiO-66-NH_(2) and S-ZrO_(2) in PVDF-HFP polymer,the open metal sites of MOFs and acid surfaces of S-ZrO_(2) can immobilize anions by strong Lewis acid-base interaction,which enhances the effect of immobilization anions,achieving a high Li-ion transference number(t_(+))of 0.72,and acquiring a high ionic conductivity of 1.05×10^(-4) S·cm^(-1) at 60℃.The symmetrical Li/Li cells with the anion-immobilized SCEs may steadily operate for over 600 h at 0.05 mA·cm^(-2) without the shortcircuit occurring.Besides,the solid composite Li/LiFePO_(4)(LFP)cell with the anion-immobilized SCEs shows a superior discharge specific capacity of 158 mAh·g^(-1) at 0.2 C.The results illustrate that the anion-immobilized SCEs are one of the most promising choices to optimize the performances of ASSLMBs.

关 键 词：solid composite electrolytes poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP) all solid-state lithium metal batteries metal-organic frameworks anion-immobilized 

分 类 号：TM912[电气工程—电力电子与电力传动]