研究论文Article*E-mail:huojinghao@sust.edu.cnReceivedNovember10,2022;publishedDecember19,2022.ProjectsupportedbytheNaturalScienceFoundationofShaanxiUniversityofScienceandTechnology(No.2016BJ-49)andNaturalScienceFoundationofShaanxiProvince(No.2020JM-505).项目受陕西科技大学自然科学基金(No.2016BJ-49)和陕西省自然科学基金(No.2020JM-505)资助.6http://sioc-journal.cn©2023ShanghaiInstituteofOrganicChemistry,ChineseAcademyofSciencesActaChim.Sinica2023,81,6—13化学学报ACTACHIMICASINICA基于P掺杂TiO2/C纳米管负极的高性能锂离子电容器张国强a霍京浩*,a王鑫a郭守武a,b(a陕西科技大学材料科学与工程学院西安710021)(b上海交通大学电子信息与电气工程学院上海200240)摘要以磷酸二氢钠(NaH2PO4)为磷源,通过溶剂热法制备了P掺杂的TiO2/C(P-TiO2/C)纳米管以改善TiO2的储锂性能.电化学测试表明:P-TiO2/C负极具有高的比容量(在0.1A•g−1的电流密度下达到335mAh•g−1)、优异的倍率性能(在2.0A•g−1的电流密度下为92mAh•g−1)及循环性能(在1.0A•g−1的电流密度下经过1000次循环后放电比容量仍维持在135mAh•g−1).并且,P-TiO2/C在2mV•s−1时的赝电容贡献约为96%.由P-TiO2/C负极和活性炭正极组装的锂离子电容器在250W•kg−1的功率密度下能量密度能够达到74.7Wh•kg−1.此外,该锂离子电容器在10000次循环后比电容保持率约为43%.此外,该器件在1.0A•g−1下循环10000次后充满电仍可点亮18只红色的LED灯组成的“LIC”字样.该工作为高性能锂离子电容器TiO2负极材料的设计提供了思路.关键词二氧化钛;磷掺杂;负极;锂离子电容器P-dopedTiO2/CNanotubesasAnodesforHigh-performanceLi-ionCapacitorsZhang,GuoqiangaHuo,Jinghao*,aWang,XinaGuo,Shouwua,b(aSchoolofMaterialsScienceandEngineering,ShaanxiUniversityofScience&Technology,Xi’an710021)(bSchoolofElectronicInformationandElectricalEngineering,ShanghaiJiaoTongUniversity,Shanghai200240)AbstractAsananodematerialforLi-ioncapacitors(LICs),TiO2exhibitspseudocapacitivebehavior,lowsodiumstoragepotentialandsmallstructuralchangesinlithiumstorageprocess.However,poorconductivityandslowiondiffusionleadtosluggishlithiumstoragekinetics.Usingsodiumdihydrogenphosphate(NaH2PO4)asaphosphorussource,P-dopedTiO2/C(P-TiO2/C)nanotubesarepreparedbya...
