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不同形貌LiMn_2O_4的电化学及Li^+扩散性能 被引量:2

Electrochemical and Li^+ diffusion performance of LiMn_2O_4 with different morphology
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摘要 合成了球形和立方体形貌的MnCO3前驱体,再用熔融浸渍和程序升温法煅烧,得到两种LiMn2O4正极材料。XRD和SEM分析表明:两种LiMn2O4均为纯净立方尖晶石型,颗粒形貌保持完好。球形材料的性能优于立方体形材料,在3.50~4.30 V充放电,0.1C首次放电比容量为133.4 mAh/g,5.0C平均放电比容量达104.3 mAh/g。用恒电位间歇滴定技术(PITT)测得Li+扩散系数(DLi)在3.80~4.30 V为10-10~10-12cm2/s,在4.00 V和4.15 V左右出现两个极小值。 MnCO3 precursors with spherical and cubic morphology were synthesized and subsequently transformed to two kinds of LiMn2O4 cathode material through meltimpregnation and temperature programmed process.XRD and SEM analyses showed that both of the two kinds of LiMn2O4 had pure phase of cubic spinel structure,the morphology was well retained during the calcination process.The spherical material had better electrochemical performance than the cubic one,which delivered an initial specific discharge capacity of 133.4 mAh/g at 0.1 C and remained average specific discharge capacity of 104.3 mAh/g at 5.0 C when charged-discharged in 3.50~4.30 V.The diffusion coefficients of Li+(DLi)varied from 10-10~10-12 cm^2/s in 3.80~4.30 V were tested by potentiostatic intermittent titration technique(PITT),appeared two minimum values at around 4.00 V and 4.15 V.
出处 《电池》 CAS CSCD 北大核心 2012年第1期11-14,共4页 Battery Bimonthly
基金 武汉理工大学研究生自由创新基金(2010-ZY-LX-012) 武汉理工大学自主创新基金(2010-la-013)
关键词 熔融浸渍 程序升温 扩散系数 锰酸锂(LiMn2O4) melt-impregnation temperature programmed diffusion coefficient lithium manganese oxide(LiMn2O4)
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参考文献14

  • 1Xia Y Y,Yoshio M J.Optimization of spinel Li1+xMn2-yO4 as a4 V L-i cell cathode in terms of a L-i Mn-O phase diagram[J].J Electrochem Soc,1997,144(12):4 186-4 189.
  • 2Fei C,Jai P.A comparative electrochemical study of LiMn2O4spinel thin-film and porous laminate[J].Electrochim Acta,2002,47(10):1 607-1 613.
  • 3刘昊,何涌,包鲁明,李芳芳,杨眉.LiMn_2O_4的结晶度对电化学性能的影响[J].电池,2006,36(4):271-273. 被引量:3
  • 4曲涛,田彦文,翟玉春.采用PITT与EIS技术测定锂离子电池正极材料LiFePO_4中锂离子扩散系数[J].中国有色金属学报,2007,17(8):1255-1259. 被引量:14
  • 5Fei J B,Cui Y,Yan X H,et al.Controlled preparation of MnO2hierarchical hollow nanostructures and their application in watertreatment[J].Adv Mater,2008,20(3):452-456.
  • 6Xiang M H,Jian J L,Yan C,et al.Preparation of spherical spinelLiMn2O4 cathode material for lithium ion batteries[J].Solid StateElectrochem,2005,9(6):438-444.
  • 7Xia Y Y,Hidefumi T,Hideyuki N,et al.Studies on an L-i Mn-Ospinel system(obtained by melt-impregnation)as a cathode for 4 Vlithium batteries[J].J Power Sources,1995,56(1):61-67.
  • 8Sung W K,Su I P.Analysis of cell impedance measured on theLiMn2O4 film electrode by PITT and EIS with Monte Carlo simu-lation[J].J Electroanal Chem,2002,528(1-2):114-120.
  • 9Izumi T,Norifumi F,Muxina K.Synthesis of spherical LiMn2O4microparticles by a combination of spray pyrolysis and dryingmethod[J].Powder Technol,2008,181(3):228-236.
  • 10Dino T,Maria J T,Eduardo E,et al.Three-dimensionally or-dered macroporous lithium manganese oxide for rechargeablelithium batteries[J].Chem Mater,2008,20(14):4 783-4 790.

二级参考文献22

  • 1吴梅银,王建明,张鉴清,曹楚南.掺锰氢氧化镍的结构与电化学性能(英文)[J].物理化学学报,2005,21(5):523-527. 被引量:17
  • 2刘昊,何涌.矿物材料真密度测定方法的改进[J].矿物学报,2005,25(4):321-324. 被引量:9
  • 3Yang W S,Zhang G,Xie J Y,et al.A combustion method to prepare spinel phase LiMn2O4 cathode materials for lithium-ion batteries[J].J Power Sources,1999,81 -82:412-415.
  • 4PAN Zhao-lu(潘兆橹).结晶学及矿物学(上册)[M].Beijing(北京):Geological Publishing(地质出版社),1984.132-154.
  • 5Whittingham M S.Lithium batteries and cathode materials[J].Chemical Reviews,2004,104(10):4271-4301.
  • 6Padhi A K,Nanjundawamy K S,Masquelier C,Okada S,Goodenough J B.Effect of structure on the Fe^3+/Fe^2+ redox couple in iron phnsphates[J].J Electrochem Soc,1997,144(5):1609-1613.
  • 7Liu P,Wu H Q.Diffusion of lithium in carbon[J].Solid State Ionics,1996,92(1/2):91-97.
  • 8Umeda M,Dokko K,Fujita Y,Mohamedi M,Uchida I,Selman J R.Electrochemical impedance study of Li-ion insertion into mesocarbon microbead single particle electrode(part Ⅰ):Graphitized carbon[J].Electrochimica Acta,2001,47(6):885-890.
  • 9Deiss E.Spurious potential dependence of diffusion coefficients in Li+ insertion electrodes measured with PITT[J].Eelctrochimica Acta,2002,47(25):4027-4034.
  • 10Bohnke C,Bohnke O,Fourquet J L.Electrochemical intercalation of lithium into LiLaNb2O7[J].J Electrochem Soc,1997,144(4):1151-1158.

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