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Preparation of Li+:TiO2 nanowires, Li4Ti5O12 nanotubes, and a Li4Ti5O12 nanotube/graphene composite by single-spinneret electrospinning for application in a lithium-ion battery
CrystEngComm ( IF 2.6 ) Pub Date : 2022-10-05 , DOI: 10.1039/d2ce01153k
Hongquan Yu 1 , Chenchen Huang 2 , Yutian Deng 2 , Baojiu Chen 1 , Danyang Wu 1 , Sai Xu 1 , Yong Zhang 2 , Hong Zhao 2
Affiliation  

One-dimensional (1D) Li+:TiO2 nanowires and Li4Ti5O12 nanotubes and a Li4Ti5O12 nanotube/graphene composite were prepared by using an electrospinning technique. The types and molecular weights of polymer templates and the annealing rate have important effects on the electrospun products. The Li4Ti5O12 nanotubes and the Li4Ti5O12 nanotube/graphene composite were obtained by heating at a rate of about 0.5 °C min−1 from a polyvinylpyrrolidone (PVP) template, while the Li+:TiO2 nanowires were obtained by heating at a rate of about 2 °C min−1 from a polyethylene oxide (PEO) template. The Li4Ti5O12 nanotubes have an outer diameter of approximately 120 to 200 nm and their wall thickness is in the range of 30 to 40 nm. The morphology and size of the Li4Ti5O12 nanotube/graphene composite are similar to those of the Li4Ti5O12 nanotubes. The Li+:TiO2 nanowires have diameters in the range of 600–3000 nm. The crystal structure of the Li+:TiO2 nanowires was changed from anatase TiO2 to spinel Li4Ti5O12 with increasing Li+ dopant concentration. The electrochemical performance of the Li4Ti5O12 nanotubes and the Li4Ti5O12 nanotube/graphene composite for intended use in a lithium-ion battery (LIB) was investigated and compared with that of the TiO2:Li+ nanowires. The Li4Ti5O12 nanotube/graphene composite specimen exhibits the highest discharge specific capacities and cycle stability, which can reach an initial capacity of 186.4 mA h g−1, and remain at 175.0 mA h g−1 after 100 cycles under a current density of 100 mA g−1.

中文翻译:

单喷丝头静电纺丝制备用于锂离子电池的 Li+:TiO2 纳米线、Li4Ti5O12 纳米管和 Li4Ti5O12 纳米管/石墨烯复合材料

采用静电纺丝技术制备一维(1D)Li + :TiO 2纳米线和Li 4 Ti 5 O 12纳米管以及Li 4 Ti 5 O 12纳米管/石墨烯复合材料。聚合物模板的种类和分子量以及退火速率对静电纺丝产品有重要影响。通过以约0.5°C min -1的速率加热得到Li 4 Ti 5 O 12纳米管和Li 4 Ti 5 O 12纳米管/石墨烯复合材料来自聚乙烯吡咯烷酮(PVP)模板,而Li + :TiO 2纳米线是通过从聚环氧乙烷(PEO)模板以约2°C min -1的速率加热获得的。Li 4 Ti 5 O 12纳米管具有大约120到200nm的外径并且它们的壁厚在30到40nm的范围内。Li 4 Ti 5 O 12纳米管/石墨烯复合材料的形貌和尺寸与Li 4 Ti 5 O 12纳米管相似。Li + :TiO 2纳米线的直径范围为 600-3000 nm。随着Li +掺杂剂浓度的增加,Li + :TiO 2纳米线的晶体结构从锐钛矿TiO 2变为尖晶石Li 4 Ti 5 O 12 。研究了用于锂离子电池(LIB)的Li 4 Ti 5 O 12纳米管和Li 4 Ti 5 O 12纳米管/石墨烯复合材料的电化学性能,并与TiO 2 :Li +纳米线的电化学性能进行了比较。 . 李四钛_5 O 12纳米管/石墨烯复合样品表现出最高的放电比容量和循环稳定性,在100 mA g的电流密度下可达到186.4 mA hg -1的初始容量,并在100次循环后保持在175.0 mA hg -1 -1
更新日期:2022-10-05
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