CAJ | 학술논문

为解决高温烧结制备的锂离子电池负极材料 Li4 Ti5 O12易团聚、形貌差的问题,采用水热低温烧结法,以钛酸丁酯、氢氧化锂分别为钛源和锂源,异丙醇为溶剂,制备纯相 Li4 Ti5 O12。用 X射线衍射仪(XRD)、扫描电子显微镜(SEM)和比表面测试仪对样品进行表征,采用恒流充放电法对钛酸锂进行电化学性能评价。结果表明,在400℃低温煅烧后可得到单一纯相尖晶石型 Li4 Ti5 O12,所制备样品为具有大比表面积的纳米絮状粉体,表现出良好的电化学性能,在常温条件下,以0.1C倍率进行充放电,首次放电容量达到155.7 mA·h/g,经50次循环后容量仍保持约143 mA·h/g,容量保持率达到91.8%。
위해결고온소결제비적리리자전지부겁재료 Li4 Ti5 O12역단취、형모차적문제,채용수열저온소결법,이태산정지、경양화리분별위태원화리원,이병순위용제,제비순상 Li4 Ti5 O12。용 X사선연사의(XRD)、소묘전자현미경(SEM)화비표면측시의대양품진행표정,채용항류충방전법대태산리진행전화학성능평개。결과표명,재400℃저온단소후가득도단일순상첨정석형 Li4 Ti5 O12,소제비양품위구유대비표면적적납미서상분체,표현출량호적전화학성능,재상온조건하,이0.1C배솔진행충방전,수차방전용량체도155.7 mA·h/g,경50차순배후용량잉보지약143 mA·h/g,용량보지솔체도91.8%。
Pure lithium titanate Li4Ti5O12was synthesized by a facile hydrothermal method using TBT and LiOH·H2O as raw materials.The as-prepared samples were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM)and BET analysis.The electrochemical performance of the sample was tested by using galvanostatic charge-discharge method.The results show that pure single-phase spinel Li4 Ti5 O12 can be obtained at a low calcination temperature of 400 ℃. The particles are nanoflocculent-like with greater specific surface area.The flocculent-like Li4 Ti5 O12 has excellent electro-chemical performance with initial discharge capacity of 155.7 mA·h/g at 0.1C rate.After cycled for 50 times at 0.1C,the capacity is remained about 143 mA·h/g.The capacity retention ratio can be up to 91.8%.