为提高Li4Ti5O12材料的振实密度,以十六烷基三甲基溴化铵(CTAB)为结构导向剂,通过溶胶-凝胶法合成了球形Li4Ti5O12材料.利用TGA/DSC、XRD、SEM、CV和恒流充放电仪对材料的结构、形貌和电化学性能进行测试.结果表明,在800℃热处理12 h所得样品为单一的尖晶石晶体结构,结晶度较高,颗粒基本呈规则球形、流动性较好,粒径分布均匀,并表现出较好的电化学性能,振实密度达1.86 g/mL.在室温下以0.1 C充放电时,其首次放电比容量为173.19 mAh/g,50次充放电循环后其放电比容量保持率为97.4％.
To increase the tap density of Li4Ti5O12,spherical Li4Ti5O12 was synthesized by a sol-gel method using hexadecyl trimethyl ammonium bromide (CTAB) as structure directing agents.The structure,morphology and electrochemical performance of the sample were tested by TGA/DSC,XRD,SEM,CV and galvanostatic charge/discharge device.It is found that when heated at 800 ℃ for 12 h,the sample has a pure spinel crystal structure,high degree of crystallinity,spherical particle,good fluidity,uniform particle size distribution and good electrochemical performance with a tap density of 1.86 g/mL.At 0.1 C discharging rate,the first discharge specific capacity is 173.19 mAh/g,and after 50 cycles,its specific discharge capacity retention rate is 97.4％.
参考文献
| [1] | Ohzuku T.;Yamamoto N.;Ueda A. .ZERO-STRAIN INSERTION MATERIAL OF LI[LI1/3TI5/3]O-4 FOR RECHARGEABLE LITHIUM CELLS[J].Journal of the Electrochemical Society,1995(5):1431-1435. |
| [2] | 赵尧敏,刘国群,江志裕.锂离子电池负极材料Li4TiH5O12的制备及电化学性能[J].稀有金属材料与工程,2009(06):1076-1079. |
| [3] | 王瑾,成雪莲,王子港,杨晖.高分散纳米晶Li_4Ti_5O_（12）电极材料的制备及电化学性能的研究[J].无机材料学报,2010(03):235-241. |
| [4] | Tang YF;Yang L;Qiu Z;Huang JS .Preparation and electrochemical lithium storage of flower-like spinel Li4Ti5O12 consisting of nanosheets[J].Electrochemistry communications,2008(10):1513-1516. |
| [5] | Li JR;Tang ZL;Zhang ZT .Controllable formation and electrochemical properties of one-dimensional nanostructured spinel Li4Ti5O12[J].Electrochemistry communications,2005(9):894-899. |
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