以MnSO4?H2 O 和Li3 PO4前驱体为原料,以水和二甘醇(DEG)的混合物为溶剂,采用微波溶剂热法合成LiMnPO4/C复合正极材料,用 XRD、SEM、CV、EIS 和恒电流充放电技术研究了温度对微波溶剂热合成材料的结构、微观形貌和电化学性能的影响.结果表明,随着反应温度的增加,块状前驱体 Li3 PO4逐渐转变为片状LiMnPO4.190℃时合成的材料为 Pmnb 空间群橄榄石型结构 LiMnPO4晶体.该温度得到的 LiMnPO4/C 的1 C放电比容量为108．3 mAh/g,循环50次后容量保持率高达99．9％.
LiMnPO4/C composites were prepared by a microwave solvothermal method using MnSO4?H2 O and Li3 PO4 precursor as source materials,water and diethylene glycol mixed solvents as reaction solvents.The effects of temperature on the structure and electrochemical performances of samples were investigated by XRD, SEM,CV,EIS charge/discharge tests.As the temperature increased,block like Li3 PO4 precursor gradually transformed into a flaky LiMnPO4.The sample prepared at 190 ℃ formed the olivine structure with the space group Pmnb.The prepared LiMnPO4/C delivered an initial discharge capacity of 108.3 mAh/g with a capacity retention of 99.9% after 50 cycles at 1 C.
参考文献
| [1] | Padhi AK.;Goodenough JB.;Nanjundaswamy KS..PHOSPHO-OLIVINES AS POSITIVE-ELECTRODE MATERIALS FOR RECHARGEABLE LITHIUM BATTERIES[J].Journal of the Electrochemical Society,19974(4):1188-1194. |
| [2] | Jiangfeng Ni;Yoshiteru Kawabe;Masanori Morishita;Masaharu Watada;Tetsuo Sakai.Improved electrochemical activity of LiMnPO_4 by high-energy ball-milling[J].Journal of Power Sources,201119(19):8104-8109. |
| [3] | 刘爱芳;刘亚菲;胡中华;高歌;雷磊.金属离子掺杂LiMnPO4的电化学性能研究[J].功能材料,2010(7):1144-1146,1149. |
| [4] | Yonemura M;Yamada A;Takei Y;Sonoyama N;Kanno R.Comparative kinetic study of olivine LixMPO4 (M = Fe, Mn)[J].Journal of the Electrochemical Society,20049(9):A1352-A1356. |
| [5] | 王志兴;李向群;常晓燕;郭华军;彭文杰;李新海;陈启元.锂离子电池橄榄石结构正极材料LiMnPO4的合成与性能[J].中国有色金属学报,2008(4):660-665. |
| [6] | Thierry Drezen;Nam-Hee Kwon;Paul Bowen;Ivo Teerlinck;Motoshi Isono;Ivan Exnar.Effect of particle size on LiMnPO_4 cathodes[J].Journal of Power Sources,20072(2):949-953. |
| [7] | Seung-Min Oh;Hun-Gijung;Chong Seung Yoon;Seung-Taek Myung;Zonghai Chen;Khalil Amine;Yang-Kook Sun.Enhanced electrochemical performance of carbon-LiMn_(1-x)Fe_xPO_4 nanocomposite cathode for lithium-ion batteries[J].Journal of Power Sources,201116(16):6924-6928. |
| [8] | Yang, Z.;Cao, G.-S.;Xie, J.;Zhao, X.-B..Oleic acid-assisted preparation of LiMnPO _4 and its improved electrochemical performance by Co doping[J].Journal of solid state electrochemistry,20123(3):1271-1277. |
| [9] | Choi, D.;Wang, D.;Bae, I.-T.;Xiao, J.;Nie, Z.;Wang, W.;Viswanathan, V.V.;Lee, Y.J.;Zhang, J.-G.;Graff, G.L.;Yang, Z.;Liu, J..LiMnPO_4 nanoplate grown via solid-state reaction in molten hydrocarbon for Li-ion battery cathode[J].Nano letters,20108(8):2799-2805. |
| [10] | Ramesh Kumar, P.;Venkateswarlu, M.;Satyanarayana, N..Three-dimensional lithium manganese phosphate microflowers for lithium-ion battery applications[J].Journal of Applied Electrochemistry,20123(3):163-167. |
| [11] | Yang JS;Xu JJ.Synthesis and characterization of carbon-coated lithium transition metal phosphates LiMPO4 (M = Fe, Mn, Co, Ni) prepared via a nonaqueous sol-gel route[J].Journal of the Electrochemical Society,20064(4):A716-A723. |
| [12] | Tae-HeeKim;Han-Saem Park;Myeong-Hee Lee;Sang-YoungLee;Hyun-Kon Song.Restricted growth of LiMnP04 nanoparticles evolved from a precursor seed[J].Journal of Power Sources,2012Jul.15(Jul.15):1-6. |
| [13] | The Nam Long Doan;Izumi Taniguchi.Cathode performance of LiMnP0_4/C nanocomposites prepared by a combination of spray pyrolysis and wet ball-milling followed by heat treatment[J].Journal of Power Sources,20113(3):1399-1408. |
| [14] | 王志高;李建玲;王新东.LiFePO4/C的微波法制备和性能[J].电池,2006(2):142-143. |
| [15] | 唐昌平;应皆荣;雷敏;李维;姜长印;万春荣.控制结晶-微波碳热还原法制备高密度LiFePO4/C[J].电化学,2006(2):188-190. |
| [16] | Hongmei Ji;Gang Yang;Huan Ni;Soumyajit Roy;Joao Pinto;Xuefan Jiang.General synthesis and morphology control of LiMnPO_4 nanocrystals via microwave-hydrothermal route[J].Electrochimica Acta,20119(9):3093-3100. |
| [17] | Idalia Bilecka;Andreas Hintennach;Marta D. Rossell.Microwave-assisted solution synthesis of doped LiFePO4 with high specific charge and outstanding cycling performance[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,201116(16):5881-5890. |
| [18] | Feng Yu;Lili Zhang;Mingyuan Zhu;Yongxin An;Lili Xia;Xugen Wang;Bin Dai.Overwhelming microwave irradiation assisted synthesis of olivine-structured LiMP04 (M = Fe, Mn, Co and Ni) for Li-ion batteries[J].Nano Energy,2014:64-79. |
| [19] | 吕正中;周震涛.LiFePO4/C复合正极材料的结构与性能[J].电池,2003(5):269-271. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%