欢迎访问《电化学(中英文)》期刊官方网站,今天是
研究论文

PVA碱性凝胶聚合物电解质薄膜电化学稳定性研究

  • 王军红 ,
  • 刘建敏 ,
  • 杨化滨 ,
  • 周作祥
展开
  • 南开大学新能源材料化学研究所,南开大学新能源材料化学研究所,南开大学新能源材料化学研究所,南开大学新能源材料化学研究所 天津300071 ,天津300071 ,天津300071 ,天津300071

收稿日期: 2005-05-28

  修回日期: 2005-05-28

  网络出版日期: 2005-05-28

Electrochemical Stability of PVA Alkaline Gel Polymer Electrolyte Membranes

  • WANG Jun-hong ,
  • LIU Jian-min ,
  • YANG Hua-bin~ ,
  • ZHOU Zuo-xiang
Expand
  • (Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071,China

Received date: 2005-05-28

  Revised date: 2005-05-28

  Online published: 2005-05-28

摘要

应用溶解—铸膜法制备聚乙烯醇(polyvinylalcohol,PVA)碱性凝胶聚合物电解质(gelpolymerelectrolyte,GPE)薄膜.交流阻抗(EIS)测试表明,随着KOH含量的增加,该薄膜的离子电导率表现为先增大而后减小的变化趋势,当KOH含量为42%(bymass,下同)时,电导率达到最大值,为2.01×10-3S/cm.X射线衍射(XRD)结果表明,当膜中KOH含量大于20%时,晶态的PVA就逐渐转变为非晶态结构.又当KOH含量增加到一定值后,由于体系中未电离的非晶态KOH量的增多而导致离子电导率下降.循环伏安(CV)和拉曼光谱(Raman)结果表明,该薄膜具有很好的电化学稳定性,可应用于碱性二次电池.

本文引用格式

王军红 , 刘建敏 , 杨化滨 , 周作祥 . PVA碱性凝胶聚合物电解质薄膜电化学稳定性研究[J]. 电化学, 2005 , 11(2) : 129 -132 . DOI: 10.61558/2993-074X.1627

Abstract

Polyvinyl alcohol (PVA) alkaline polymer gel electrolyte(GPE) membranes were successfully prepared by a solution-casting technique and their electrochemical stabilities were investigated. The electrochemical impedance spectrum (EIS) results showed that the ionic conductivity of the PVA alkaline GPE membranes first increased with the increase of KOH content, then decreased with the further increase of KOH. When the weight percentage of the KOH in the PVA alkaline GPE membrane approached to 42%, it exhibitedthe highest ionic conductivity of 2.01×10~(-3 ) S/cm at room temperature (R.T.). The X-ray diffraction (XRD) results revealed that with the increase of KOH the crystalline of the PVA was disrupted and converted into an amorphous phase. While the ionic conductivity decreased due to the increase of the amorphous unionized KOH in the membranes with the further increase of KOH. The cyclic voltammograms (CV) and Raman spectra indicated that the GPE membranes had promising electrochemical stabilities. It is suggested that the PVA alkalineGPE membranes could be used for practical applications in alkaline rechargeablebatteries.

参考文献

[1] FentonDE,ParkerJM,WrightPV.Complexesofal kalimetalionswithpoly(ethyleneoxide)[J].Poly mer,1973,14:589. [2] WrightPV.Electricalconductivityinioniccomplexes ofpoly(ethyleneoxide)[J].Br.Polym.J.,1975,7:319. [3] ArmandMB,ChabagnoJM,DuclotM.SecondInter nationalMeetingonSolidElectrolytes,ExtendedAb stract[C].St.Andrews,Scotland:paperno.6.5,Sept.1978:20~22. [4] LewandowskiA,SkorupskaK,MalinskaJ.Novelpoly(vinylalcohol)KOH H2Oalkalinepolymerelectrolyte[J].SolidStateIonics,2002,133:265. [5] PalaciosI,CastilloR,VargasRA.Thermalandtrans portpropertiesofthepolymerelectrolytebasedonpoly(vinylalcohol)KOH H2O[J].Electrochim.Acta,2003,48:2195. [6] MohamadAA,MohamedNS,YahyaMZ,etal..Ionicconductivitystudiesofpoly(vinylalcohol)alka linesolidpolymerelectrolyteanditsuseinnickel zinc cells[J].SolidStateIonics,2003,156:171.
文章导航

/