Preparation and properties of PEO/LiClO4/KH560-SiO2 composite polymer electrolyte by sol-gel composite-in-situ method

Composite polymer electrolytes based on polyethylene oxide（PEO） were prepared by using LiClO4 as doping salt and silane-modified SiO2 as filler. SiO2 was formed in-situ in （PEO）8LiClO4 matrix by the hydrolysis and condensation reaction of Si（OC4H9）4. The crystallinity,morphology and ionic conductivity of composite polymer electrolyte films were examined by differential scanning calorimetry,scanning electron microscopy,atom force microscopy and alternating current impedance spectroscopy,respectively. Compared with the crystallinity of the unmodified SiO2 as inert filler,that of composite polymer electrolytes is decreased. The results show that silane-modified SiO2 particles are uniformly dispersed in （PEO）8LiClO4 composite polymer electrolyte film and the addition of silane-modified SiO2 increases the ionic conductivity of the （PEO）8LiClO4 more noticeably. When the mass fraction of SiO2 is about 10%,the conductivity of （PEO）8LiClO4-modified SiO2 attains a maximum value of 4.8×10^-5 S·cm^-1.     

改性无机微粒掺杂的固体聚合物电解质

为了提高锂离子电池固体聚合物电解质的电导率,用硫酸对纳米SiO₂和TiO₂进行表面改性,并加入到PEO基体中.采用溶液铸膜法制备出无机微粒 LiClO₄PEO全固态聚合物电解质（SPE）.运用数字显微镜、交流阻抗和拉伸测试对电解质膜的性能进行了表征,研究了无机微粒中w（酸）对电解质电导率的影响.结果表明,SiO₂微粒中w（酸）对电导率影响不大;TiO₂微粒中的w（酸）与电导率成正比.当w（酸）=8%时,电解质的室温电导率可达1.83×10^-6 S/cm.改性后的TiO₂ 微粒,可进一步提高固体聚合物电解质的电导率.     

PEO基聚合物电解质的制备

为采用蒸馏水替代有机溶剂溶解PEO,减轻对空气的污染,改善由于有机溶剂挥发较快使得聚合物膜易裂的缺点,采用溶液浇铸法,首次以蒸馏水为溶剂溶解PEO,以纳米SiO₂为填料,锂盐采用LiClO₄,制备出复合聚氧化乙烯基电解质PEO-LiClO₄-SiO₂,并对纳米SiO₂的作用进行分析．采用SEM、XRD和交流阻抗法等测试方法对PEO基复合电解质的微观形貌、晶体结构和相关电化学性能等进行表征．结果表明:添加纳米填料后,PEO聚合物电解质的结晶度下降,拉伸强度增加．PEO-LiClO₄-SiO₂(6％)聚合物电解质的电化学稳定窗口为4.8 V,离子电导率(25 ℃)为3.95×10-5S·cm-1,离子迁移数为0.29．     

CeO2-Y2O3电解质薄膜等效电路研究

测量了采用溶胶-凝胶法制备的CeO2-Y2O3电解质薄膜的阻抗谱，结果表明阻抗谱与薄膜的热处理温度有关。根据阻抗谱的变化及薄膜的XRD图，提出了薄膜内部的模拟等效电路，并由此对不同热处理温度下薄膜的阻抗谱进行了分析。     

复合凝胶聚合物电解质的制备及电化学性能

以偏氟乙烯和六氟丙烯共聚物为基体,通过与聚甲基丙烯酸甲酯共混,加入导电盐LiPFs、增塑剂聚乙烯吡咯烷酮,制备了高电导率的复合凝胶聚合物电解质（CGPE）。用红外光谱测试了聚合物电解质膜的结构,用交流阻抗法测试了CGPE的导电性能,用线性扫描伏安法研究了它的电化学稳定性。测试了以CGPE为电解质制备的锂离子电池的充放电性能。结果表明,当聚甲基丙烯酸甲酯（PMMA）质量分数为20％时,CGPE电导率大于10^-3s／cm,在4．65V电化学窗口以下稳定。以磷酸亚铁锂为正极时,在0．1C和0．2C倍率下放电时,聚合物电解质电池的首次放电容量分别为138mAh／g和98．3mAh／g。     

聚合物锂离子电池用凝胶电解质的研究进展

综述聚氧化乙烯(PEO)、聚偏氟乙烯(PVDF)、聚甲基丙烯酸甲酯(PMMA)和聚丙烯腈(PAN)等聚合物材料用作锂离子电池凝胶电解质的特性.PAN体系凝胶电解质的离子电导率一般在10-3S/cm数量级,其锂离子迁移数比PEO体系大,可达到0.5;与PAN基凝胶电解质相比,以PMMA为基的凝胶电解质与锂电极的界面稳定性和循环性能更好,但是机械强度较差;PVDF大分子链上含有很强的推电子基(-CF2),且介电常数较高(ε=8.4),有利于促进锂盐更充分的溶解,增加载流子浓度.提出添加无机纳米粒子的凝胶电解质是目前的研究热点,是凝胶电解质的发展趋势.     

新型复合电解质PEO-LiClO4-Cex Ti（1-x）O2的制备与性能研究

以PEO-LiC lO4为基质材料,以CeO2和TiO2作为无机填料,采用原位复合法与溶液浇铸法相结合的方法制备了PEO-LiC lO4-CexTi1-xO2全固态复合聚合物电解质薄膜（CPE）.利用交流阻抗方法和差示扫描量热法对CPE的电导率、玻璃化转变温度和结晶度进行了研究.结果表明,添加不同粒径的纳米氧化物可在不同尺度上更加有效地破坏聚合物基体的结晶行为,增大离子传输所需的无定形区域,同时,降低了聚合物PEO的玻璃化转变温度和结晶度,并使其结晶度在较长时间内维持在较低水平,最终使离子电导率得到了明显提升.     

MMA与4-VP共聚物的制备和性能研究

由于4-乙烯基吡啶（4-VP）均聚合成的聚电解质的亲水性强和力学性能差，使其应用受到很大的限制。采用自由基共聚法，用甲基丙烯酸甲酯（MMA）对其改性，得到共聚物P（4-VP-MMA），再将共聚物与正溴辛烷进行季铵化反应得到线形的、水不溶聚电解质。对该聚电解质用IR、DSC表征，并检测其拉伸性能和吸水率，效果很好、     

声电联合技术氧化降解2-氯酚的研究

在优化电解（EC）条件的基础上，以2-氯酚（2-CP）为模拟污染物，研究了超声（US）-电解（EC）联合技术氧化降解的性能，并初步探讨了其降解过程．结果表明：电解质Na2SO4浓度和pH是影响声电组合技术的重要因素，当pH〉9，电解质Na2SO4浓度大于0．15mol／L时，声电组合降解2-CP的效率最高．US—EC降解2-CP的动力学方程符合拟一级动力学关系，其表观反应速率常数（0．0096min^-1）大于EC（0．0055min^-1）和US（0．0034min^-1）两种单因素作用之和，表明超声与电解组合降解2-CP时，对电解产生显著的协同效应。通过LC／MS检测，2-氯-1，4-对苯醌为2-CP降解中间产物，说明2-CP的降解经历了羟基对位氧化、开环等过程．     

液晶离聚物蒙脱土掺杂PMMA/PEO电解质膜的性能

为了解决聚环氧乙烷作为聚合物电解质基体在室温下电导率低的问题,采用由液晶离聚物插层蒙脱土(LCT)制成的层状硅酸盐纳米复合材料作为功能性掺杂剂,采用自动刮膜技术制备液晶离聚物蒙脱土掺杂PMMA/PEO聚合物电解质膜.结果表明:掺杂0.5%LCT的PMMA/PEO电解质中PEO结晶度最低为25.0%;掺杂1.5%LCT的PMMA/PEO电解质的初始分解温度由157.4℃提高到212.0℃;添加2.5%LCT的电解质膜表面最平整,几乎没有孔洞;添加0.5%LCT后电解质的电导率由1.12×10^-5S/cm提高到3.26×10^-5S/cm,提高了约2倍;添加1.5%LCT后电解质拉伸强度提高到6.43 MPa,添加0.5%LCT后电解质的断裂伸长率提高到883%. LCT的加入有利于PMMA/PEO聚合物电解质膜电性能、热性能和力学性能的提高.     

AMPS对PEO/PMMA固态聚合物电解质电导率的影响

针对固态聚合物电解质室温电导率较低的问题,采用刮膜法制备了PEO/PMMA/LiClO_4/AM PS共混聚合物电解质,考察了2-丙烯酰胺-2-甲基丙磺酸(AM PS)的端基磺酸基团对电解质性能的影响.结果表明,添加AMPS后,红外图谱中出现了由C—O的拉伸振动和SO_3~(2-)的络合作用所引起的尖峰.PMMA与PEO共混后,大大降低了PEO的结晶度,且添加AMPS后,电解质形成了完全均相体系.AMPS的添加使得电解质的电导率明显提升了两个数量级.当AMPS的质量分数为1.3%时,电解质的室温电导率达到最大值.添加同样含有端基磺酸基团的液晶离聚物(LCI)后,电解质的电导率无明显提升,因而可以选择磺酸基团质量比更高的AMPS作为添加剂.     

Electrochemical behaviors of novel composite polymer electrolytes for lithium batteries

A novel composite polymer electrolyte was prepared by blending an appropriate amount of LiC104 and 10% (mass fraction) fumed SiO2 with the block copolymer of poly (ethylene oxide) (PEO) synthesized by poly (ethylene glycol) (PEG) 400 and CH2CI2.The ionic conductivity, electrochemical stability, interfacial characteristic and thermal behavior of the composite polymer electrolyte were studied by the measurements of AC impedance spectroscopy, linear sweep voltammetry and differential scanning calorimetry (DSC), respectively. The glass transition temperature acts as a function of salt concentration, which increases with the LiC104 content.Lewis acid-base model interaction mechanism was introduced to interpret the interactive relation between the filled fumed SiO2 and the lithium salt in the composite polymer electrolyte. Over the salt concentration range and the measured temperature, the maximum ionic conductivity of the composite polymer electrolyte (10^4.41 S/cm) appeared at EO/Li=25 (mole ratio) and 30~C, and the beginning oxidative degradation potential versus Li beyond 5 V.     

PEO基聚合物固体电解质的键合性能

为了促进微机电系统封装技术的发展, 设计了应用聚氧化乙烯 (polyethylene oxide, PEO) 作为主体材料, 通过掺杂不同的锂盐获得聚合物固体电解质用于阳极键合进行封装.阳极键合对材料的要求主要是具有离子导电性, 因此采用X射线小角衍射 (small-angle X-ray scattering, SAXS) 和傅里叶红外光谱 (Fouriex transform infrared radiation spectroscopy, FTIR) 对设计的高分子固体电解质的导电机理进行分析.研究结果表明:LiClO₄的离解能更小;锂离子的迁移数更多;随着其质量分数的增加, 电导率更高;通过键合结果发现, PEO-LiClO₄和金属铝键合界面过渡层的产生是两者得以焊合的关键.     

PEI-PEO基全固态电解质的性能

聚氧乙烯(PEO)基全固态复合电解质可作为高能全固态锂电池的电解质膜材料.采用溶液浇铸法,以PEO为基质,LiC1O4为锂盐,聚乙烯亚胺(PEI)和柠檬酸(CA)及无机纳米粉体(NCA)做性能改进剂,制备PEI-PEO-LiC1O4-CA-NCA全固态复合聚合物电解质(SCPE)膜,对其进行X射线衍射(XRD)表征和交...     

(Gd2O3)x（ZrO2）1-x（x=0.05-0.15）电解质材料的电导及其分子动力学模拟

为了探讨作为固体氧化物燃料电池电解质材料的可行性,采用交流阻抗谱研究了(Gd2O3)x(ZrO2)1-x(x=0.05-0.15)固体电解质材料的晶粒电导率,并通过分子动力学方法模拟了Gd2O3掺杂ZrO2固体电解质材料的动力学行为,计算并分析了温度和Gd2O3掺杂量对体系离子传导性能的影响.实验和模拟结果均表明,升高温度能明显增强离子电导性能.当Gd2O3掺杂量为8 mol%时,材料的电导性能取得最优值.     

Effect of inorganic additives on physical and chemical properties of PEO-LiCIO_4 polymer electrolyte for lithium-ion batteries

Inorganic additives-added PEO-based solid composite polymer electrolyte(SCPE)was prepared u-sing solution casting method. The effects of LiNi_(0.8)Co_(0.2)O_2 on the physical and chemical properties of the elec-trolyte were investigated. The products were characterized by X-ray diffraction(XRD), Fourier transform infra-red spectrometer(FFIR)and differential scanning calorimetry(DSC). The electrochemical performances of SCPE were measured. Results show that properties of the SCPE are improved significantly by adding LiNi_(0.8)Co_(0.2)O_2 into PEO polymer electrolyte. Its conductivity reaches 5 × 10~(-4)S/cm(25℃)while retaining good mechanical and processing properties.     

聚乙烯醇/聚丙烯酸凝胶聚合物电解质的研究

以丙烯酸、聚乙烯醇、N,N-亚甲基双丙烯酰胺等为原料,采用水溶液聚合法制备聚乙烯醇/聚丙烯酸水凝胶聚合物基质,与6 mol/LKOH溶液制成吸液率约为173%凝胶聚合物电解质,产物在室温时电导率可达567.3 ms.cm-1。并且讨论了聚乙烯醇/聚丙烯酸凝胶聚合物电解质的导电机理及凝胶聚合物吸液率与电导率的关系。     

Synthesis and Characterization of (PEO)_x~-(V_(0.85)Mo_ (0.15)_2O_5 Nanocomposite Films

1　IntroductionSomeinorganiclayeredcompounds ,suchasMoO3 andV2 O5,belongtoarapidlygrowingfieldofcontempo raryresearchinterest,becausetheycanbeintercalatedbyavarietyofalkaliions (Li+ ,Na+ ,etc .) ,atomsorlargermoleculestoformintercalationhost guestcompounds ,whichareexpectedtobepromisingcandidatematerialsforcathodesofsecondaryLibatteriesandelectrochromicdevices[1] .Polymer layeredoxidenanocompositesareat tractingmuchattentionduetotheirspecialstructureaswellassuperiorelectrical,electrochemical…     

Preparation of Poly （ethylene oxide） （PEO） Modified Tungsten Oxide Hybrid Films via Sol-Gel Processing

Poly ( ethylene axide ) ( PEO ) modified WO3 thin films were prepared on glass substrates with special temperature. The sol-gel transition proess was #westigated by using DTA - TG , SEM and XRD. The elec-trochemical characteristic of the films was studied by cyclic voltmmetry measurement. The results show that PEO has heavy effects on the crystallization of W03 during structure evolution because of the interaction between PEO and WO3. It increases the crystallization temperature of the gels and thus improves the electrochemical properties and cyclic life of WO3 film as electrochromic materials.