Quasi-solid-state polymer plastic crystal electrolyte for subzero lithium-ion batteries  

作　　者：Yumei Zhou Fengrui Zhang Peixin He Yuhong Zhang Yiyang Sun Jingjing Xu Jianchen Hu Haiyang Zhang Xiaodong Wu 

机构地区：[1]i-Lab,Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO),Chinese Academy of Sciences,Suzhou 215123,Jiangsu,China [2]Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials,Key Laboratory for the Synthesis and Application of Organic Functional Molecules,Ministry of Education,College of Chemistry and Chemical Engineering,Hubei University,Wuhan 430062,Hubei,China [3]National Engineering Laboratory for Modern Silk,College of Textile and Clothing Engineering,Research Center of Cooperative Innovation for Functional Organic/Polymer Material Micro/Nanofabrication,Soochow University,199 Ren-Ai Road,Suzhou Industrial Park,Suzhou 215123,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2020年第7期87-93,I0003,共8页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China[grant numbers:21503265,51603135,21473241];Ministry of Science and Technology[grant number:2016YFB0100102];Nantong Science and Technology Bureau[grant number:JC2018038]。

摘　　要：Succinonitrile(SN)-based polymer plastic crystal electrolytes(PPCEs)have attracted considerable attention as solid-state electrolytes owing to their high ionic conductivities similar to those of liquid electrolytes,excellent contacts with the electrodes,and good mechanic properties.As a crucial property of a solid-state electrolyte,the ionic conductivity of the PPCE directly depends on the interactions between the constituent parts including the polymer,lithium salt,and SN.A few studies have focused on the effects of polymer–lithium–salt and polymer–SN interactions on the PPCE ionic conductivity.Nevertheless,the impact of the lithium–salt–SN combination on the PPCE ionic conductivity has not been analyzed.In particular,tuning of the lithium-salt–SN interaction to fabricate a subzero PPCE with a high low-temperature ionic conductivity has not been reported.In this study,we design and fabricate five PPCE membranes with different weight ratios of Li N(SO2 CF3)2(Li TFSI)and SN to investigate the effect of the Li TFSI–SN interaction on the PPCE ionic conductivity.The ionic conductivities of the five PPCEs are investigated in the temperature range of–20 to 60°C by electro-chemical impedance spectroscopy.The interaction is analyzed by Fourier-transform infrared spectroscopy,Raman spectroscopy,and differential scanning calorimetry.The Li TFSI–SN interaction significantly influences the melting point of the PPCE,dissociation of the Li TFSI salt,and thus the PPCE ionic conductivity.By tuning the Li TFSI–SN interaction,a subzero workable PPCE membrane having an excellent low-temperature ionic conductivity(6×10-4 S cm–1 at 0°C)is obtained.The electro-chemical performance of the optimal PPCE is evaluated by using a Li Co O2/PPCE/Li4 Ti5 O12 cell,which confirms the application feasibility of the proposed quasisolid-state electrolyte in subzero workable lithium-ion batteries.

关 键 词：SUCCINONITRILE Polymer plastic crystal electrolyte Ionic conductivity Lithium-salt–succinonitrile interaction Subzero lithium-ion battery 

分 类 号：O646.1[理学—物理化学] TM912[理学—化学]