基于γ^(60)Co辐照技术原位制备高性能聚乙二醇二丙烯酸酯基准固态电解质  

High-performance poly(ethylene glycol)diacrylate-based quasi solid electrolyte via in-situγ^(60)Co irradiation

作　　者：李新宇 杨学英 陈琦琛 李睿洋 李伟[2] 邓翊 张鹏 赵金保[2] LI Xinyu;YANG Xueying;CHEN Qichen;LI Ruiyang;LI Wei;DENG Yi;ZHANG Peng;ZHAO Jinbao(College of Energy,Xiamen University,Xiamen 361102,China;College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]厦门大学能源学院,福建厦门361102 [2]厦门大学化学化工学院,福建厦门361005

出　　处：《厦门大学学报(自然科学版)》2025年第1期103-111,共9页Journal of Xiamen University:Natural Science

基　　金：国家重点研发计划(2021YFB2400300);国家自然科学基金(21875195);中央高校基础科研经费(20720190040)。

摘　　要：[目的]为解决固态电解质中离子传输缓慢、电极和电解质界面接触不良等问题,通过γ^(60)Co辐照技术原位制备高性能准固态电解质.[方法]以聚乙二醇二丙烯酸酯[poly(ethylene glycol)diacrylate,PEGDA]为单体,碳酸酯基液态电解质为增塑剂和氧化铝涂覆的聚酰亚胺(PI@Al_(2)O_(3))隔膜为支撑膜,利用γ射线电离辐照技术实现原位固化,制得PEGDA基准固态电解质(PEGDA-based quasi solid electrolyte,PEGDA-QSE),考察PEGDA的质量分数和辐照剂量对制备的PEGDA-QSE性能的影响,并对优化条件下制得的PEGDA-QSE进行物性表征和电化学性能测试.[结果]液态高亲和性单体PEGDA经过γ射线辐照之后原位交联形成三维结构,并将液态小分子固定在其中,减少泄露以及燃烧风险.内部的小分子起到辅助离子传输、提升离子传导的作用.在PEGDA质量分数为10%、辐照剂量为30 kGy的条件下制备的PEGDA-QSE展现出优异的电化学性能和安全性能.其室温离子电导率为0.69 mS/cm,电化学窗口为4.7 V.所组装的磷酸铁锂半电池在0.5 C倍率下稳定循环300圈,循环后容量为147.3 mAh/g.软包电池在机械断裂条件下依然可以正常工作.[结论]本研究基于γ^(60)Co辐照技术原位制备的PEGDA-QSE具有高离子电导率、优异的界面接触和安全性能等特点,为高性能固态锂电池的设计提供了一种可行的解决方案.[Objective]Traditional lithium-ion batteries with liquid electrolytes presents risks such as flammability and leakage,making them highly prone to safety accidents during application.A feasible solution to these problems is replacing the liquid electrolyte with a solid-state electrolyte.However,the requirement of ionic conductivity and interfacial compatibility often failed to simultaneously meet for solid-state electrolyte in the application.In order to achieve high ionic conductivity and good interfacial compatibility of solid-state electrolyte,poly(ethylene glycol)diacrylate-based quasi solid electrolyte(PEGDA-QSE)was prepared via in-situγ^(60)Co irradiation.[Methods]The PEGDA-QSE was prepared via in-situγ^(60)Co irradiation,using PEGDA as the monomer and a polyimide separator coated with Al_(2)O_(3)(PI@Al_(2)O_(3))as the support membrane.The precursor solution was made by mixing commercial carbonate-based liquid electrolyte and PEGDA with appropriate proportions.The effects of PEGDA mass fraction and irradiation dose on the performance of the prepared PEGDA-QSE were investigated,along with physical characterization and electrochemical performance tests conducted under optimized conditions.The situation of PEGDA-QSE polymerization was analyzed using the Fourier transform infrared spectrometer(FT-IR)equipped with an attenuated total reflection(ATR)detector.The FT-IR spectral resolution was about 4 cm-1.The crystal structures of PI@Al_(2)O_(3) and PEGDA-QSE were characterized using the X-ray diffraction(XRD)with Cu Kαray(λ=0.154 nm).[Results]The liquid monomer PEGDA with high affinity was transformed into a poly(PEGDA)with solid-state three-dimensional crosslinked structure after appropriate dose irradiation withγ^(60)Co.The small liquid molecules of commercial liquid electrolyte were locked in the three-dimensional crosslinked structure of poly(PEGDA),which could reduce the risks such as flammability and leakage.The small liquid molecules in the three-dimensional crosslinked structure could aid in Li+transp

关 键 词：准固态电解质 γ^(60)Co辐照 原位固化 锂电池 

分 类 号：TM911.3[电气工程—电力电子与电力传动]