以月桂酸为表面活性剂,通过无水溶胶-凝胶法合成了高分散的Li_4Ti_5O_(12)纳米晶.采用XRD、SEM、TG-DSC以及恒流充放电测试等手段对材料的形貌、结构和电化学性能进行表征.通过研究Li/Ti摩尔比、表面活性剂的量及煅烧温度对物相结构、颗粒形貌及电化学性能的影响,优化制备工艺.结果表明,表面活性剂的量对Li_4Ti_5O_(12)的微观形貌及其电化学性能有显著的影响.800℃热处理10h后的产物,颗粒尺寸在100～300nm之间,基本无团聚,具有较好的分散性,显示出优异的电化学性能,1和2C下,首次放电容量分别为163.3和132.3mAh/g,50次放电循环后,放电容量无明显衰减.
Nano-sized Li_4Ti_5O_(12) powders with high dispersivity were prepared by a novel sol-gel route using lauric acid as surfactant.The crystal structure,microstructure and the electrochemical properties of the samples were characterized by XRD,SEM,TG-DSC and galvanostatically charge-discharge experiments.The effects of molar ratio of Li to Ti,the content of surfactant and the calcining temperature on the phase structure,the microstructure and the electrochemical properties were studied to optimize process.The results demonstrated that the crystallization,microstructure and electrochemical properties were influenced significantly by the content of the surfactant.Li_4Ti_5O_(12) powders calcined at 800℃ for 10h comprised of crystallites with the particle size in the range 100-300nm revealing high dispersivity almost without any agglomerates,exhibiting an excellent electrochemical performance.Its discharge capacity at 1 and 2C rates can reach 163.3 and 132.3mAh/g,respectively.After 50 cycles,fairly stable cycling performance was achieved without obvious capacity fade.
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] | Mukai K;Ariyoshi K;Ohzuku T .[J].Journal of Power Sources,2005,146(1-2):213-216. |
| [3] | Zaghib K;Simoneau M;Armand M et al.[J].Journal of Power Sources,1999,81-82:300-305. |
| [4] | Kingo Ariyoshi;Ryoji Yamato;Tsutomu Ohzuku .Zero-strain insertion mechanism of Li[Li{sub}(1/3)Ti{sub}(5/3)] O{sub}4 for advanced lithium-ion (shuttlecock) batteries[J].Electrochimica Acta,2005(6):1125-1129. |
| [5] | Ge H;Li N;Li DY;Dai CS;Wang DL .Study on the effect of Li doping in spinel Li4+xTi5-xO12 (0 <= x <= 0.2) materials for lithium-ion batteries[J].Electrochemistry communications,2008(7):1031-1034. |
| [6] | Huang S H;Wen Z Y;Zhu X J et al.[J].Journal of Power Sources,2007,165(01):408-412. |
| [7] | J. Wolfenstine;J.L. Allen .Electrical conductivity and charge compensation in Ta doped Li_4Ti_5O_(12)[J].Journal of Power Sources,2008(1):582-585. |
| [8] | Robertson A D;Trevino L;Tukamoto H et al.[J].Journal of Power Sources,1999,81-82:352-357. |
| [9] | Y.-K. Sun;D.-J. Jung;Y.S. Lee;K.S. Nahm .Synthesis and electrochemical characterization of spinel Li[Li_((x-1)/3)Cr_xTi_((5-2x)/3)]O_4 anode materials[J].Journal of Power Sources,2004(2):242-245. |
| [10] | Mukai K;Ariyoshi K;Ohzuku T .[J].Journal of Power Sources,2005,146(1-2):213-216. |
| [11] | 苏岳锋,吴锋,臧戈,包丽颖,陈实.多孔炭模板法制备Li4Ti5O12及其嵌锂行为[J].物理化学学报,2008(06):1002-1006. |
| [12] | Guefri A;Charest P;Kinoshita K et al.[J].Journal of Power Sources,2004,126(1-2):163-168. |
| [13] | Cheng L;Li XL;Liu HJ;Xiong HM;Zhang PW;Xia YY .Carbon-coated Li4Ti5O12 as a high rate electrode material for Li-ion intercalation[J].Journal of the Electrochemical Society,2007(7):A692-A697. |
| [14] | G.J. Wang;J. Gao;L.J. Fu;N.H. Zhao;Y.P. Wu;T. Takamura .Preparation and characteristic of carbon-coated Li_4Ti_5O_(12) anode material[J].Journal of Power Sources,2007(2):1109-1112. |
| [15] | Junjie Huang;Zhiyu Jiang .The preparation and characterization of Li{sub}4Ti{sub}5O{sub}12/carbon nano-tubes for lithium ion battery[J].Electrochimica Acta,2008(26):7756-7759. |
| [16] | Liu H;Feng Y;Wang K;Xie JY .Synthesis and electrochemical properties of Li4Ti5O12/C composite by the PVB rheological phase method[J].The journal of physics and chemistry of solids,2008(8):2037-2040. |
| [17] | Chunhai Jiang;Masaki Ichihara;Itaru Honma;Haoshen Zhou .Effect of particle dispersion on high rate performance of nano-sized Li{sub}4Ti{sub}5O{sub}12 anode[J].Electrochimica Acta,2007(23):6470-6475. |
| [18] | Jiang C H;Hosono E J;Ichihara M et al.[J].Journal of the Electrochemical Society,2008,155(08):A553-A556. |
| [19] | Choi D;Kumta P N .[J].Journal of Power Sources,2007,163(1-2):1064-1069. |
| [20] | Dan Xie;Wei Pan .Study on BaBi_4Ti_4O_(15) nanoscaled powders prepared by sol-gel method[J].Materials Letters,2003(19):2970-2974. |
| [21] | Bach S;Pereira-Ramos J P;Baffier N .[J].Journal of Power Sources,1999,81-82:273-276. |
| [22] | 赵国玺.表面活性剂物理化学[M].北京:北京大学出版社,1984:179. |
| [23] | A. D. Robertson;H. Tukamoto;J. T. S. Irvine .Li{sub}(1+x)Fe{sub}(1-3x)Ti{sub}(1+2x)O{sub}4 (0.0≤x≤0.33) based spinels: possible negative electrode materials for future Li-Ion batteries[J].Journal of the Electrochemical Society,1999(11):3958-3962. |
| [24] | 苏岳锋,吴锋,陈朝峰.纳米微晶TiO2合成Li4Ti5O12及其嵌锂行为[J].物理化学学报,2004(07):707-711. |
| [25] | Kim DH;Ahn YS;Kim J .Polyol-mediated synthesis of Li4Ti5O12 nanoparticle and its electrochemical properties[J].Electrochemistry communications,2005(12):1340-1344. |
| [26] | Yuan T;Cai R;Wang K et al.[J].Ceramics International,2009,35(05):1757-1768. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%