采用二步固相法制备了LiFePOa/Al/C复合正极材料.利用X射线衍射仪、扫描电镜和透射电镜表征样品的晶体结构、形貌、粒径和包覆状态,并研究了铝粉加入量对复合材料电化学性能的影响.结果表明,金属Al与LiFePO4发生了界面反应,生成多种副产物,并在LiFePO4的表面形成钝化膜.在LiFePO4颗粒的表面包覆有不规则形状的金属铝和1～2 nm的碳层.当铝粉加入量为3wt％时,LiFePO4/Al/C复合材料的电化学性能最佳,室温10C倍率下放电克容量为117.8 mAh/g;样品在-20℃下,0.1C放电克容量为105.6 mAh/g,相对于常温的放电容量比率为73.8％.
参考文献
| [1] | Padhi A K,Nanjundaswamy K S,Goodenough J B.Phosphoolivine as positive electrode materials for rechargeable lithium batteries.J.Electrochem.Soc.,1997,144(4):1188-1194. |
| [2] | Takahashi Masaya,Tobishima Shin-ichi,Takei Koji,et al.Reaction behavior of LiFePO4 as a cathode material for rechargeable lithium batteries.Solid State Ionics,2002,148(3/4):283-289. |
| [3] | Prosini P E Lisi M,Zane D,et al.Determination of the chemical diffusion coefficient of lithium in LiFePO4.Solid State Ionics,2002,148 (1/2):45-51. |
| [4] | Mi C H,Cao Y X,Zhang X G,et al.Synthesis and characterization of LiFePO4/(Ag+C) composite cathodes with nano-carbon webs.Powder Technology,2008,181(3):301-306. |
| [5] | Lin Y,Gao M X,Zhu D,et al.Effects of carbon coating and iron phosphides on the electrochemical properties of LiFePO4/C.J.Power Sources,2008,184(2):444-448. |
| [6] | Konarova Muxina,Taniguchi Izumi.Preparation of carbon coated LiFePO4 by a combination of spray pyrolysis with planetary ball-milling followed by heat treatment and their electrochemical properties.J.Power Technology,2009,191(1/2):111-116. |
| [7] | Bai Yong-mei,Qiu Peng,Wen Zhong-liu,et al.Improvement of electrochemical performances of LiFePO4 cathode materials by coating of polythiophene.J.Alloys Compd.,2010,508(1):1-4. |
| [8] | Lee Kyung Tae,Lee Kyung Sub.Electrochemical properties of LiFe0.9Mn01POa/Fe2P cathode material by mechanical alloying.J.Power Sources,2009,189(1):435-439. |
| [9] | 李旭,彭文杰,李新海,等.LiFe1-xMgxPO4的制备及其电化学性能.中国有色金属学报,2008,18(6):1123-1128. |
| [10] | Wang Y,Yang Y U,Hu X,et al.Electrochemical performance of Ru-doped LiFePO4/C cathode material for lithium-ion batteries.J.Alloys Compd.,2009,481(1/2):590-594. |
| [11] | Konarova Muxina,Taniguchi Izumi.Synthesis of carbon-coated LiFePO4 nanoparticles with high rate performance in lithium secondary batteries.J.Power Technology,2010,195(11):3661-3667. |
| [12] | Dominko R,Bele M,Gaberscek M,et al.Porous olivine composites synthesized by Sol-Gel technique.J.Power Sources,2006,153(2):274-280. |
| [13] | Bodoardo S,Gerbaldi C,Meligrana G,et al.Optimisation of some parameters for the preparation of nanostmctured LiFePO4/C cathode.lonics,2009,15(1):19-26. |
| [14] | Hillert M.Phase Equilibria,Phase Diagram and Phase transformation.Britain Lundui:Cambridge University Press,1998:170-182. |
| [15] | Herle P S,Ellis B,Coombs N,et al.Nano-network electronic conduction in iron and nickel olivine phosphates.Nature materials,2004,3(3):147-152. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%