Abstract: LiMn0.8-xFe0.15+xMg0.05PO4 anode material was synthesized by the solvothermal method.The structure,morphology and electrochemical properties of as-prepared samples were characterized by XRD,SEM and galvanostatic charge and discharge process.The results showed that samples were nano particles with olivine-type structure.Mg doping improved capacity rate of Mn and Fe,promoted by 23.2% at 0.1C.Specific capacity after 100 cycles at 1 C was 110.1mAh/g with retention rate of more than 94%.
戴仲葭. 锂离子电池正极材料LiMn0.8-xFe0.15+xMg0.05PO4的制备、表征及电化学过程研究[J]. 化工新型材料, 2018, 46(9): 198-201.
Dai Zhongjia. Synthesis,characterization and electrochemical process of LiMn0.8-xFe0.15+xMg0.05PO4 anode material for lithium ion battery. New Chemical Materials, 2018, 46(9): 198-201.
[1]Padhi A K,Nanjundaswamy K S,Goodenough J B.Phospho-olivines as positive-electrode materials for rechargeable lithium batteries[J].Journal of the Electrochemical Society,1997,144(4):1188-1194. [2]Yang S,Zavalij P Y,Stanley Whittingham M.Hydrothermal synthesis of lithium iron phosphate cathodes[J].Electrochemistry Communications,2001,3(9):505-508. [3]Chung S Y,Bloking J T,Chiang Y M.Electronically conductive phospho-olivines as lithium storage electrodes[J].Nature Materials,2002,1(2):123-128. [4]Tajimi S,Ikeda Y,Uematsu K,et al.Enhanced electrochemical performance of LiFePO4 prepared by hydrothermal reaction[J].Solid State Ionics,2004,175(1/2/3/4):287-290. [5]Zhou F,Cococcioni M,Kang K,et al.The Li intercalation potential of LiMPO4 and LiMSiO4 olivines with M=Fe,Mn,Co,Ni[J].Electrochemistry Communications,2004,6(11):1144-1148. [6]Wang D,Buqa H,Crouzet M,et al.High-performance,nano-structured LiMnPO4 synthesized via a polyol method[J].Journal of Power Sources,2009,189(1):624-628. [7]Bramnik N N,Nikolowski K,Baehtz C,et al.Phase transitions occurring upon lithium insertion-extraction of LiCoPO4[J].Chemistry of Materials,2007,19(4):908-915. [8]Saravanan K,Vittal J,Reddy M V,et al.Storage performance of LiFe1-xMnxPO4 nanoplates (x=0,0.5,and 1)[J].J Solid State Electrochem,2010,14(10):1755-1760. [9]Saravanan K,Ramar V,Balaya P,et al.Li(MnxFe1-x)PO4/C(x=0.5,0.75 and 1) nanoplates for lithium storage application[J].Journal of Materials Chemistry,2011,21(38):14925-14935. [10]Wang H,Yang Y,Liang Y,et al.LiMn1-xFexPO4 nanorods grown on graphene sheets for ultrahigh-rate-performance lithium ion batteries[J].Angewandte Chemie International Edition,2011,50(32):7364-7368. [11]Martha S K,Grinblat J,Haik O,et al.LiMn0.8Fe0.2PO4:an advanced cathode material for rechargeable lithium batteries[J].Angewandte Chemie International Edition,2009,48(45):8559-8563. [12]Fisher C A J,Hart Prieto V M,Islam M S.Lithium battery materials LiMPO4(M=Mn,Fe,Co,and Ni):insights into defect association,transport mechanisms,and doping behavior[J].Chemistry of Materials,2008,20(18):5907-5915. [13]Lu Q,Hutchings G S,Zhou Y,et al.Nanostructured flexible Mg-modified LiMnPO4 matrix as high-rate cathode materials for Li-ion batteries[J].Journal of Material Chemistry A,2014,2(18):6368-6373. [14]Gao H,Jiao L,Yang J,et al.High rate capability of Co-doped LiFePO4/C[J].Electrochimica Acta,2013,97:143-149. [15]Li C,Zhang S,Cheng F,et al.Porous LiFePO4/NiP composite nanospheres as the cathode materials in rechargeable lithium-ion batteries[J].Nano Research,2008,1(3):242-248. [16]Yang G,Ni H,Liu H,et al.The doping effect on the crystal structure and electrochemical properties of LiMnxM1-xPO4(M=Mg,V,Fe,Co,Gd)[J].Journal of Power Sources,2011,196(10):4747-4755. [17]Harrison K L,Bridges C A,Paranthaman M P,et al.Temperature dependence of aliovalent-vanadium doping in LiFePO4 cathodes[J].Chemistry of Materials,2013,25(5):768-781. [18]Yoo H,Jo M,Jin B S,et al.Flexible morphology design of 3D-macroporous LiMnPO4 cathode materials for Li secondary batteries:ball to flake[J].Advanced Energy Materials,2011,1(3):347-351.