制备热解炭/磷酸亚铁锂和纳米炭纤维/磷酸亚铁锂核壳结构材料, 研究了电化学性能. 结果表明, 热解炭和纳米炭纤维包覆层能有效地降低磷酸亚铁锂材料的电阻率, 大大提高材料的充放电容量和循环稳定性. 与热解炭相比, 纳米炭纤维具有一维结构和优异的力学性能, 更适于作为磷酸亚铁锂电极材料的高效导电剂.
Two types of core-shell structured cathode materials-pyrolytic carbon(PyC)/LiFePO4 and carbon nanofiber(CNF)/LiFePO4 were synthesized by fluidized bed chemical vapor deposition method and their electrochemical properties were explored. The PyC or CNF coating can effectively reduce the resistivity of LiFePO4, and greatly improved its charge-discharge capacity and cyclability. Compared with PyC, the one dimensional structure and excellent mechanical performance of CNF make it more suitable as the conductive additive of LiFePO4.
参考文献
| [1] | A.K.Padhi, K.S.Nanjundaswamy, J.B.Goodenough, Phospho-olivines as positive-electrode materials for rechargeable lithium batteries, J. Electrochem. Soc, 144, 1188(1997) [2] S.F.Yang, P.Y.Zavalij, M.S.Whittingham, Hydrothermal synthesis of lithium iron phosphate cathodes, Electrochem. Commun, 3, 505(2001)[3]Z.H.Chen, J.R.Dahn, Reducing carbon in LiFePO4/C composite electrodes to maximize specific energy, volumetric energy, and tap density, J. Electrochem. Soc., 149, A1184(2002)[4]C.H.Mi, X.B.Zhao, G.S.Cao, J.P.Tu, In situ synthesis and properties of carbon-coated LiFePO4 as Li-ion battery cathodes, J. Electrochem. Soc., 152, A483(2005)[5]WANG Guan, JIANG Zhiyu, Preparation of LiFePO4/C composite material using Fe(w)and its electrochemical performance, Battery, 37, 195(2007)[6](王冠, 江志裕, 以三价铁制备LiFePO4/C复合材料及其电化学性能, 电池, 37, 195(2007))[7] K.Kim, J.H.Jeong, I.J.Kim, H.S.Kim, Carbon coatings with olive oil, soybean oil and butter on nano-LiFePO4, J. Power Sources, 167, 524(2007)[8] N.Ravet, Y.Chouinard, J.F.Magnan, S.Besner, M.Gauthier, M.Armand, Electroactivity of natural and synthetic triphylite, J. Power Sources, 97-98, 503(2001)[9] J.L.Li, T.Suzuki, K.Naga, Y.Ohzawa, T.Nakajima, Electrochemical performance of LiFePO4 modified by pressure-pulsed chemical vapor infiltration in lithium-ion batteries, Mat Sci. Eng. B-Solid, 142, 86(2007)[10] I.Belharouak, C.Johnson, K.Amine, Synthesis and electrochemical analysis of vapor-deposited carbon-coated LiFePO4, Electrochem. Commun, 7, 983(2005)[11] X.L.Li, F.Y.Kang, X.D.Bai, W.Shen, A novel network composite cathode of LiFePO4/multiwalled carbon nanotubes with high rate capability for lithium ion batteries, Electrochem. Commun, 9, 663(2007)[12] I.V.Thorat, V.Mathur, J.N.Harb, DR.Wheeler, Performance of carbon-fiber-containing LiFePO4 cathodes for high-power applications, J. Power Sources, 162, 673(2006)[13] P.P.Prosini, D.Zane, M.Pasquali, Improved electrochemical performance of a LiFePO4-based composite cathode, Electrochimica Acta, 46, 3517(2001)[14] P.P.Prosini, M.Lisi, D.Zane, M.Pasquali, Determination of the chemical diffusion coefficient of lithium in LiFePO4, Solid State Ionics, 148, 45(2002)[15] S.H.Liu, Z.M.Wang, Li F, S.Bai, L.Wen, H.M.Cheng, Improving the electrochemical properties of natural graphite spheres by coating pyrolytic carbon shell, New Carbon Materials, 23, 30(2008)[16]ZHANG Weigang, Chemical Vapor Deposition-from Gaseous Hydrocarbon to Solid Carbon, 1st edition, (Beijing, Science Press, 2007) p.222[17](张伟刚, 化学气相沉积--从烃类气体到固体碳, 第一版, (北京, 科学出版社, 2007) p.222)[18]WANG Haojing, WANG Hongfei, LI Dongfeng, ZHU Xingming, HE Fu, WANG Xinkui, The effect of graphitization temperature on the microstructure and mechanical properties of carbon fibers, New Carbon Materials, 20, 157(2005)[19](王浩静,王红飞,李东风,朱星明,贺福,王心葵,石墨化温度对炭纤维微观结构及其力学性能的影响,新型炭材料,20,157(2005))[20] G.T.K.Fey, T.L.Lu, Morphological characterization of LiFePO4/C composite cathode materials synthesized via a carboxylic acid route, J. Power Sources, 178, 807(2008)[21] D.Y.Wang, X.D.Wu, Z.X.Wang, L.Q.Chen, Cracking causing cyclic instability of LiFePO4 cathode material, J Power Sources, 140, 125(2005)[22] N.J.Yun, H.W.Ha, K.H.Jeong, H.Y.Park, K.Kim, Synthesis and electrochemical properties of olivine-type LiFePO4/C composite cathode material prepared from a poly(vinyl alcohol)-containing precursor, J. Power Sources, 160, 1361(2006)[23] R.Dominko, M.Bele, M.Gaberscek, M.Remskar, D.Hanzel, S.Pejovnik, J.Jamnik, Impact of the carbon coating thickness on the electrochemical performance of LiFeP04/C composites, J. Electrochem. Soc., 152, A607(2005) 21 P.P.Prosini, M.Carewska, S.Scaccia, P.Wisniewski, M.Pasquali, Long-term cyclability of nanostructured LiFePO4, Electrochimica Acta, 48, 4205(2003) |
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