以碳酸氢铵为沉淀剂采用共沉淀法合成球形Co 0.9 Ni 0.05 Mn 0.05 CO 3前驱体，以碳酸盐前驱体和Li 2 CO 3为原料，在空气中通过固相反应制备出LiCo 0.9 Ni 0.05 Mn 0.05 O 2正极材料，研究烧结温度对产物结构及电化学性能的影响。采用扫描电镜(SEM)、X射线衍射(XRD)和光电子能谱(XRS)分别表征样品的形貌、结构和元素价态。结果表明：不同烧结温度下合成产物的性能差别很大，较适合的合成温度为900℃；在3.0~4.5 V电压范围内， LiCo0.9Ni0.05Mn0.05O2显示出较好的倍率性能；在25℃测试条件下，材料在0.2C、0.5C、1C、5C和10C时的放电比容量分别为181.6、178.3、173.9、167.8和157.1 mA?h/g。
The spherical precursor of metal carbonate, Co 0.9 Ni 0.05 Mn 0.05 CO 3 , was prepared by co-precipitation method using NH 4 HCO 3 as precipitating agent. LiCo 0.9 Ni 0.05 Mn 0.05 O 2 was prepared by solid-state reaction method in air using Co 0.9 Ni 0.05 Mn 0.05 CO 3 and Li 2 CO 3 as starting materials. The effects of sintering temperature on the structure and electrochemical properties of the product were studied. The morphology and structure of LiCo 0.9 Ni 0.05 Mn 0.05 O 2 were characterized by SEM and XRD, respectively. The valence state of transition metal was determined by XPS. The results show that sintering temperature has a critical role in the performance of the product and the suitable sintering temperature is 900℃. LiCo0.9Ni0.05Mn0.05O2 exhibits good cycle performance and high rate capability within the voltage range of 3.0?4.5 V. At 25 ℃, the initial discharge capacity are 181.6, 178.3, 173.9, 167.8 and 157.1 mA?h/g at 0.2C, 0.5C, 1C, 5C and 10C, respectively.
参考文献
| [1] | 张宝,张明,李新海,王志兴,郭华军,彭文杰.锂离子电池正极材料LiNi0.45Co0.10Mn0.45O2的合成及电化学性能[J].中南大学学报（自然科学版）,2008(01):75-79. |
| [2] | 朱伟雄,李新海,王志兴,郭华军.锂离子电池富锂材料 Li[Li0.2Ni0.2Mn0.6]O2的制备及掺杂改性[J].中国有色金属学报,2013(04):1047-1052. |
| [3] | Qin Hao;Caixia Xu;Suzhen Jia;Xiaoyun Zhao.Improving the cycling stability of LiCoO_2 at 4.5 V through surface modification by Fe_2O_3 coating[J].Electrochimica Acta,2013:439-445. |
| [4] | 杜柯,黄霞,胡国荣,彭忠东.高容量正极材料Li[Li0.2Ni0.2Mn0.6]O2的合成及电化学性能[J].中国有色金属学报,2012(04):1201-1208. |
| [5] | J.Cho;G.Kim .Enhancement of Thermal Stability of LiCoO2 by LiMn2O4 Coating[J].Electrochemical and solid-state letters,1999(6):253-255. |
| [6] | ZENG Dong-li;CABANA J;YOON W S;GERY C P .Investigation of the structure changes in Li[Ni y Mn y Co(1-2y)]O 2(y=0.05)upon electrochemical lithium deintercalation[J].CHEMISTRY OF MATERIALS,2010,22:1209-1219. |
| [7] | SAADOUNE I;LABRINI M;YAHYA M;ALMAGGOUSSI A, EHRENBERG H .LiNi 0.1 Mn 0.1 Co 0.8 O 2 electrode material:Structure changes upon lithium electrochemical extraction[J][J].Electrochimica Acta,2010,55:5180-5185. |
| [8] | BENTALEB Y;SAADOUNE I;KENZA M;SAADI L, FUJIMOTO K, ITO S .On the LiNi 0.2 Mn 0.2 Co 0.6 O 2 positive electrode material[J].Journal of Power Sources,2010,195:1510-1515. |
| [9] | Abdelfattah Mahmoud;Ismael Saadoune;Jose Manuel Amarilla;Rachid Hakkou .On the LiCo_(2/3)Ni_(1/6)Mn_(1/6)O_2 positive electrode material[J].Electrochimica Acta,2011(11):4081-4086. |
| [10] | Whitfield PS;Davidson IJ;Cranswick LMD;Swainson IP;Stephens PW .Investigation of possible superstructure and cation disorder in the lithium battery cathode material LiMn1/3N1/3Co1/3O2 using neutron and anomalous dispersion powder diffraction[J].Solid state ionics,2005(5/6):463-471. |
| [11] | 王希敏,王先友,易四勇,曹俊琪.层状锂离子电池正极材料LiNi0.8Co0.1Mn0.1O2的制备及性能[J].过程工程学报,2007(04):817-821. |
| [12] | 马全新,孟军霞,杨磊,曹文.锂离子电池正极材料LiNi0.5Co0.2Mn0.3O2的制备及电化学性能[J].中国有色金属学报,2013(02):456-462. |
| [13] | 赵军峰 .三元系锂离子电池正极材料的制备与研究[D].中南大学,2011. |
| [14] | 叶茂;周震;卞锡奎;阎杰 .电解Co-Ni-Mn合金制备LiCo1/3Ni1/3Mn1/3O2正极材[J].无机化学学报,2006,22(11):2006-2010. |
| [15] | KIM Y;KIM H S;MARTIN S W .Synthesis and electrochemical characteristics of Al 2 O 3-coated LiNi 1/3 Co 1/3-Mn1/3O2 cathode materials for lithium ion batteries[J].Electrochimica Acta,2006,52:1316-1322. |
| [16] | Lu CH;Wang HC .Microemulsion-mediated synthesis and electrochemical characterization of nanosized LiNi0.25Co0.5Mn0.25O2 powders[J].Journal of the Electrochemical Society,2005(6):C341-C347. |
| [17] | J. C. Dupin;D. Gonbeau;H. Benqlilou-Moudden;Ph. Vinatier;A. Levasseur .XPS analysis of new lithium cobalt oxide thin-films before and after lithium deintercalation[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2001(1):23-32. |
| [18] | Oswald S.;Bruckner W. .XPS depth profile analysis of non-stoichiometric NiO films[J].Surface and Interface Analysis: SIA: An International Journal Devoted to the Development and Application of Techniques for the Analysis of Surfaces, Interfaces and Thin Films,2004(1):17-22. |
| [19] | TSAI Y W;LEE J F;LIU D G .In-situ X-ray absorption spectroscopy investigations of a layered LiNi 0.65 Co 0.25 Mn 0.1 O 2 cathode material for rechargeable lithium batteries[J].Journal of Materials Chemistry,2004,14:958-965. |
| [20] | V. R. Galakhov;M. A. Korotin;N. A. Ovechkina;E. Z. Kurmaev;V. S. Gorshkov;D. G. Kellerman;S. Bartkowski;M. Neumann .Electronic structure of LiMnO_2: X-ray emission and photoelectron spectra and band structure calculations[J].The European physical journal, B. Condensed matter physics,2000(2):281-286. |
| [21] | 黄果,杨顺毅,雷钢铁,黄友元,岳敏,胡社军,任建国,侯贤华.Li（1+x）Ni0.166Co0.166Mn0.667O（2.175+x/2）正极材料的喷雾干燥法合成及电化学性能[J].中国有色金属学报,2014(03):725-732. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%