采用分段高温氧化固相法合成了掺杂La3+、F-的锂离子电池正极材料 LiLax Mn2-x Fx O4-x (x=0、0.01、0.02和0.05)。结果发现，在小于等于1C时，掺杂与否对其放电容量影响不大；在2~10C时，掺杂可明显改善倍率性能；在15C 时，掺杂量也显示出重要影响，未掺杂的LiMn2 O4的高倍率放电能力仅为4%，而掺杂x=0.02的达到56%。XRD 物相、CV循环伏安和 EIS 电化学阻抗分析支撑了倍率性能的实验结果，当不出现第二相时，随掺杂量增加，电荷转移电阻、阳极和阴极反应极化逐渐减小，反应可逆性逐渐增大，但当x=0.05出现第二相时，电荷转移电阻、阳极和阴极反应极化又开始增大。
Co-doping with La and F lithium manganese oxide LiLaxMn2-xFxO4-x(x=0,0.01,0.02,0.05)mate-rials were synthesized by segmented solid-state sintering method.The results showed that co-doping had unob-vious effect on the discharge capacity at the current density below or equal to 1C.However,the rate perform-ance from 2 to 10C was significantly improved.Besides,doping amount had great influence on the discharge property at 15C.Especially,when the doping amount was 0.02,the discharge capacity was increased from only 4% to 5 6%.The results were supported by means of X-ray diffraction (XRD),cyclic voltammetry (CV)and electrochemical impedance spectroscopy (EIS).When there was no second phase,the charge transfer resist-ance,the anodic and cathodic polarization decreased and the electrochemical reversibility enhanced gradually with the increase of doping amount.However,when the second phase appeared at x=0.05,the charge transfer resistance,anodic and cathodic polarization began to increase.
参考文献
| [1] | Scrosati B .Battery technology-challenge of portable pow-er[J].Nature,1995,373(6515):557-558. |
| [2] | Tarascon J M;Armand M .Issues and challenges facing rechargeable lithium batteries[J].Nature,2001,414(6861):359-367. |
| [3] | Byoungwoo Kang;Gerbrand Ceder .Battery Materials For Ultrafast Charging And Discharging[J].Nature,2009(7235):190-193. |
| [4] | Tsutomu Ohzuku;Ralph J. Brodd .An overview of positive-electrode materials for advanced lithium-ion batteries[J].Journal of Power Sources,2007(2):449-456. |
| [5] | Xu, B.;Qian, D.;Wang, Z.;Meng, Y.S. .Recent progress in cathode materials research for advanced lithium ion batteries[J].Materials Science & Engineering, R. Reports: A Review Journal,2012(5/6):51-65. |
| [6] | Wu, Y.;Wen, Z.;Feng, H.;Li, J. .Hollow porous LiMn _2O _4 microcubes as rechargeable lithium battery cathode with high electrochemical performance[J].Small,2012(6):858-862. |
| [7] | Tarascon J M;Wang E;Shokoohi F K et al.The spinel phase of LiMn2 O4 as a cathode in secondary lithium cells[J].Journal of the Electrochemical Society,1991,138(10):2859-2864. |
| [8] | Thackeray M M .Manganese oxides for lithium batteries[J].Progress in Solid State Chemistry,1997,25(01):1-71. |
| [9] | V. Manev;B. Banov;A. Momchilov;A. Nassalevska .LiMn_2O_4 for 4 V lithium-ion batteries[J].Journal of Power Sources,1995(1/2):99-103. |
| [10] | J.M. Tarascon;F. Coowar;G. Amatuci;F.K. Shokoohi;D.G. Guyomard .The Li_(1 + x)Mn_2O_4/C system Materials and electrochemical aspects[J].Journal of Power Sources,1995(1):103-108. |
| [11] | Nishi Y .Lithium ion secondary batteries;past 10 years and the future[J].Journal of Power Sources,2001,100(01):101-106. |
| [12] | Qianqian Yu;Keiko Sasaki;Tsuyoshi Hirajima .Bio-templated synthesis of lithium manganese oxide microtubes and their application in Li~+ recovery[J].Journal of hazardous materials,2013(Nov.15):38-47. |
| [13] | Chen Y;Xie K;Pan Y et al.Nano-sized LiMn2 O4 spi-nel cathode materials exhibiting high rate discharge capa-bility for lithium-ion batteries[J].Journal of Power Sources,2011,196(15):6493-6497. |
| [14] | 孙怀兵,朱丁,陈云贵.LiGdxMn2-xO4（0≤x≤0.1）材料的结构与电化学性能[J].功能材料,2011(05):955-958. |
| [15] | R.H. Zeng;W.S. Li;D.S. Lu;Q.M. Huang .A study on insertion/removal kinetics of lithium ion in LiCr_xMn_(2-x)O_4 by using powder microelectrode[J].Journal of Power Sources,2007(2):592-597. |
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