基于铜基底的TiO2纳米管阵列储锂性能.pdf

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1、第29卷第8期无机化学学报Vo1．29No．82013年8月CHINESEJOURNALOFIN0RGANICCHEMISTRYl759一l768基于铜基底的TiO2纳米管阵列储锂性能陈公德张卫新杨则恒王强姚宏旭(合肥工业大学化工学院，可控化学与材料化工安徽省重点实验室，合肥230009)摘要：研究了基于铜基底的TiO，纳米管阵列直接作为锂离子电池电极的储锂性能。以铜基底上生长的Cuf0H纳米棒阵列为模板，采用自牺牲模板法，通过外向包覆与内向刻蚀，制备了非晶态的TiO，纳米管阵列，然后将其在500℃下退火处理4h．获得锐钛矿型TiO

2、：纳米管阵列。采用X射线衍射、场发射扫描电镜、透射电镜、热重分析对样品进行表征；采用恒电流充放电、循环伏安和交流阻抗谱测试对退火前后TiO纳米管阵列的电化学性能进行研究。结果表明：与非晶态的TiO纳米管阵列相比，锐钛矿型TiO，纳米管阵列吸附水的含量低，结晶度高，电荷迁移阻力小，锂离子扩散系数大，结构稳定，具有更好的循环性能和倍率性能；在O．2C下，其首次放电比容量为353mAh-g--．经过40次循环后的放电比容量仍为243mAh．g-．在8C下的放电比容量为90mAh·g～。关键词：TiO2；纳米管阵列；模板；负极；锂离子电池中

3、图分类号：O614．33；TM912．9文献标识码：A文章编号：1o014861(20l3)08．1759．10DOI：10．3969／j．issn．1001—4861．2013．00．308LithiumStoragePerformancesofTi02NanotubeArraysonCopperSubstrateCHENGong—DeZHANGWei-XinYANGZe-HengWANGQiangYAOHong-Xu(SchoolofChemicalEngineering,HefeiUniversityofTechnology,

4、AnhuiKeyLaboratoryofControlla]aleChemistryReaction&MaterialChemicalEngineering,Hefei230009．China)Abstract：LithiumstorageperformancesofTiO2nanotuhearraysoncoppersubstrateaselectrodesinlithium—ionbatterieswereinvestigated．AmorphousTiO2nanotubearrayswerepreparedviaasacrif

5、icialtemplatemethodfromoutwardcoatingofTiOzandinwardetchingofCu(OH)2nanorodaraytemplatesoncoppersubstrate．AnataseTi02nanotubearrayswereobtainedbypost-heatingthesampleat500qCfor4h．ThesampleswerecharacterizedbyX—raydiffraction(XRD)，field—emissionscanningelectronmicroscop

6、y(FESEM)，transmissionelectronmicroscopy(TEM)，andthermogravimetrieanalysis(TGA)．TheelectrochemicalperformancesofamorphousandanataseTiO2nanotubearrayswereinvestigatedbygalvanostaticcharge·dischargemeasurements，cyclicvoltammetry(cv)，andelectrochemicalimpedancespectroscopy

7、(EIS)．TheresultsindicatethatcomparedwithamorphousTi02nanotubearrays，anataseTiO2nanotubearraysexhibitasuperiorratecapabilityandcyclingperformanceduetotheirloweramountsofadsorbedwater，highercrystallization，lowercharge—transferresistance，higherlithium—iondiffusioneoeficie

8、nt，andmorestableone-dimensionaltubularstructure．Theyshowaninitialspecificdischargecapacityof353mAh·g一and243mAh·g一even